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Southwest Idaho and Southeast Oregon Freeze Probability Data
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The tables list the probability of a given temperature or lower will be reached by a date. Probabilities are based on observed temperatures from 1981 through 2010. For example, Boise has a 90% chance of getting spring temperatures of 36 F on and after May 10.
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A hard freeze is when temperatures reach or fall below 28 F.
A freeze is when temperatures reach or fall below 32 F.
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SPRING
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FALL
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Boise
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
|
25%
|
10%
|
| 36 F |
May 2
|
May 11
|
May 16
|
June 5
|
June 11
|
| 32 F |
April 17
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May 2
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May 8
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May 14
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May 25
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| 28 F |
March 28
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April 9
|
April 16
|
May 5
|
May 12
|
| 24 F |
Feb. 17
|
March 2
|
March 12
|
April 9
|
April 21
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Nampa
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
|
| 36 F |
May 9
|
May 13
|
May 22
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May 30
|
June 9
|
| 32 F |
April 16
|
April 22
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May 3
|
May 10
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May 19
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| 28 F |
March 24
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April 3
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April 12
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April 22
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May 1
|
| 24 F |
March 3
|
March 5
|
March 17
|
April 3
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April 15
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Emmett
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 2
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May 8
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May 17
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May 30
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June 8
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| 32 F |
April 18
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April 28
|
May 5
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May 13
|
May 20
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| 28 F |
March 20
|
March 31
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April 14
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April 25
|
May 5
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| 24 F |
March 1
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March 5
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March 19
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April 9
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April 15
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Payette
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 1
|
May 5
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May 12
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May 24
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June 3
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| 32 F |
April 16
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April 19
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May 2
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May 12
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May 14
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| 28 F |
March 24
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April 5
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April 12
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April 23
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May 6
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| 24 F |
March 3
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March 10
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March 28
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April 11
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April 17
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Parma
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 3
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May 10
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May 16
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May 31
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June 8
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| 32 F |
April 16
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April 24
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May 2
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May 12
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May 15
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| 28 F |
March 28
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April 7
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April 14
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April 20
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May 3
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| 24 F |
March 3
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March 19
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March 28
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April 9
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April 11
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Nyssa
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
April 21
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May 4
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May 9
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May 19
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June 12
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| 32 F |
April 1
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April 13
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April 22
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May 2
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May 11
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| 28 F |
March 14
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March 26
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April 7
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April 15
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April 25
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| 24 F |
Feb. 17
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March 2
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March 16
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April 7
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April 10
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Vale, Oregon
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 5
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May 19
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June 1
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June 14
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Jul 2
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| 32 F |
April 29
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May 6
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May 10
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May 20
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May 20
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| 28 F |
April 10
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April 15
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April 24
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May 6
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May 18
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| 24 F |
March 13
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March 30
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April 12
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April 18
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May 5
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Grand View
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 1
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May 7
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May 16
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May 25
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June 6
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| 32 F |
April 17
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April 27
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May 5
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May 12
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May 16
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| 28 F |
April 6
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April 9
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April 15
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April 27
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May 7
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| 24 F |
March 3
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March 24
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March 31
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April 12
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April 17
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Glenns Ferry
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 13
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May 22
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May 31
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June 13
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June 20
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| 32 F |
April 30
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May 4
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May 13
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May 21
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May 24
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| 28 F |
April 14
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April 23
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May 3
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May 13
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May 20
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| 24 F |
March 30
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April 10
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April 17
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April 30
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May 7
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Twin Falls
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 19
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May 24
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June 5
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June 12
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June 19
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| 32 F |
April 30
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May 6
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May 10
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May 19
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May 25
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| 28 F |
April 15
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April 26
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May 1
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May 7
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May 13
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| 24 F |
March 18
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March 30
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April 11
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April 27
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May 3
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Boise
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 10
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Sept. 20
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Sept. 25
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Oct. 3
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Oct. 10
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| 32 F |
Sept. 21
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Sept. 30
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Oct. 11
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Oct. 20
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Oct. 25
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| 30 F |
Oct. 6
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Oct. 16
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Oct. 25
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Nov. 1
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Nov. 8
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| 28 F |
Oct. 15
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Oct. 29
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Nov. 4
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Nov. 19
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Nov. 26
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Nampa
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 10
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Sept. 17
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Sept.24
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Oct. 6
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Oct. 10
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| 32 F |
Sept. 25
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Oct. 6
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Oct. 11
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Oct. 20
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Oct. 25
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| 28 F |
Oct. 10
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Oct. 13
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Oct. 24
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Oct. 30
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Nov. 6
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| 24 F |
Oct. 18
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Oct. 30
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Nov. 8
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Nov. 14
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Nov. 21
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Emmett
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 13
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Sept. 21
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Oct. 1
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Oct. 7
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Oct. 10
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| 32 F |
Sept. 22
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Oct. 1
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Oct. 13
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Oct. 18
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Oct. 30
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| 28 F |
Oct. 3
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Oct. 12
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Oct. 26
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Oct. 31
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Nov. 9
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| 24 F |
Oct. 19
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Oct. 29
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Nov. 3
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Nov. 15
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Nov. 23
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Payette
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 11
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Sept. 22
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Sept. 30
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Oct. 7
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Oct. 12
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| 32 F |
Sept. 22
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Sept. 28
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Oct. 11
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Oct. 17
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Oct. 21
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| 28 F |
Oct. 3
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Oct. 12
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Oct. 21
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Oct. 29
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Nov. 2
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| 24 F |
Oct. 20
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Oct. 25
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Nov. 2
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Nov. 10
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Nov. 21
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Parma
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 9
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Sept. 13
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Sept. 21
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Sept. 30
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Oct. 5
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| 32 F |
Sept. 19
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Sept. 23
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Oct. 4
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Oct. 9
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Oct. 12
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| 28 F |
Sept. 23
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Oct. 8
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Oct. 16
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Oct. 21
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Oct. 28
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| 24 F |
Oct. 8
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Oct. 17
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Oct. 30
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Nov. 8
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Nov. 21
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Nyssa
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 18
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Sept. 23
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Oct. 1
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Oct. 8
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Oct. 14
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| 32 F |
Sept. 24
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Oct. 4
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Oct. 12
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Oct. 23
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Oct. 29
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| 28 F |
Oct. 11
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Oct. 17
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Oct. 25
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Oct. 31
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Nov. 11
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| 24 F |
Oct. 23
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Oct. 30
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Nov. 10
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Nov. 21
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Nov. 25
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Vale, Oregon
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 2
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Sept. 10
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Sept. 16
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Sept. 23
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Oct. 4
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| 32 F |
Sept. 17
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Sept. 21
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Sept. 24
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Oct. 1
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Oct. 9
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| 28 F |
Sept. 22
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Sept. 26
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Oct. 10
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Oct. 15
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Oct. 26
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| 24 F |
Oct. 2
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Oct. 12
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Oct. 20
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Oct. 31
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Nov. 6
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Grand View
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 7
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Sept. 10
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Sept. 19
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Sept. 25
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Oct. 4
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| 32 F |
Sept. 22
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Sept. 24
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Oct. 5
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Oct. 10
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Oct. 13
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| 28 F |
Sept. 26
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Oct. 8
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Oct. 14
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Oct. 24
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Oct 30
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| 24 F |
Oct. 13
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Oct 18
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Oct. 26
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Nov. 2
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Nov. 9
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Glenns Ferry
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Aug. 27
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Sept. 6
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Sept. 10
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Sept. 15
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Sept. 23
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| 32 F |
Sept. 8
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Sept. 15
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Sept. 22
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Oct. 4
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Oct. 7
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| 28 F |
Sept. 21
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Sept. 28
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Oct. 10
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Oct. 16
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Oct. 21
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| 24 F |
Sept. 28
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Oct. 14
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Oct. 24
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Nov. 2
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Nov. 11
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Twin Falls
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Aug. 30
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Sept. 5
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Sept. 13
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Sept. 21
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Sept. 22
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| 32 F |
Sept. 11
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Sept. 17
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Sept. 24
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Oct. 5
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Oct. 6
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| 28 F |
Sept. 23
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Oct. 2
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Oct. 10
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Oct. 17
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Oct. 25
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| 24 F |
Oct. 12
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Oct. 17
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Oct. 25
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Nov. 1
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Nov. 15
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Jerome
% Probability of Indicated Temperature or Lower on or After Date
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90%
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75%
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50%
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25%
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10%
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| 36 F |
May 10
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May 18
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May 27
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June 9
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June 13
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| 32 F |
April 30
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May 4
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May 10
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May 20
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June 2
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| 28 F |
April 8
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April 15
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April 27
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May 3
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May 7
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| 24 F |
March 16
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March 25
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April 4
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April 13
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April 20
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Jerome
% Probability of Temperature or Lower on or Before Date
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10%
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25%
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50%
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75%
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90%
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| 36 F |
Sept. 6
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Sept. 14
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Sept. 21
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Oct. 2
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Oct. 5
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| 32 F |
Sept. 21
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Sept. 24
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Oct. 5
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Oct. 12
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Oct. 20
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| 28 F |
Oct. 2
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Oct. 8
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Oct. 17
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Oct. 27
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Nov. 7
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| 24 F |
Oct. 12
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Oct. 17
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Oct. 30
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Nov. 7
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Nov. 15
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