Here are statistics for select climate sites in southeast Wyoming and western Nebraska with long records, based on data from 1951-2026.
We have included the historical probability of the last freeze occurring by specific dates. A 50% chance (the median) means there is a 50% chance that the last freeze has already occurred by that date. A 90% chance means there is a 90% chance the last freeze has already occurred by this date (and only a 10% chance of a freeze after).
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | Apr 19 | Apr 30 | May 15 |
| 50% chance by | May 1 | May 13 | May 25 |
| 90% chance by | May 14 | May 25 | Jun 11 |
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | May 6 | May 18 | Jun 9 |
| 50% chance by | May 20 | Jun 4 | Jun 19 |
| 90% chance by | Jun 4 | Jun 22 | Jul 4 |
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | Apr 29 | May 14 | May 31 |
| 50% chance by | May 14 | May 31 | Jun 14 |
| 90% chance by | Jun 2 | Jun 16 | Jun 29 |
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | Apr 14 | Apr 30 | May 9 |
| 50% chance by | May 3 | May 14 | May 27 |
| 90% chance by | May 20 | May 28 | Jun 14 |
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | Apr 10 | Apr 24 | May 6 |
| 50% chance by | Apr 28 | May 7 | May 17 |
| 90% chance by | May 9 | May 20 | Jun 3 |
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | Apr 16 | May 2 | May 11 |
| 50% chance by | May 3 | May 14 | May 23 |
| 90% chance by | May 18 | May 25 | Jun 8 |
| Probability | 28°F | 32°F | 36°F |
|---|---|---|---|
| 10% chance by | Apr 20 | Apr 30 | May 12 |
| 50% chance by | May 3 | May 15 | May 22 |
| 90% chance by | May 15 | Jun 1 | Jun 12 |
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