Frost & Freeze Decision Support Page

Current Frost & Freeze Headlines

Freeze Watch		Latest Regional Watches, Warnings, & Advisories
Freeze Warning
Frost Advisory

Observations
Forecast
Climatology (Spring)
Climatology (Fall)
Additional Frost & Freeze Information

Observations

Observed 24-Hour Low Temperatures
National Weather Service St. Louis
Date of Most Recent Hard Freeze	Date of Most Recent Freeze
Midwest Regional Climate Center	Midwest Regional Climate Center

Forecast

Forecast Low Temperatures Day 1
National Weather Service St. Louis
Forecast Low Temperatures Day 2	Forecast Low Temperatures Day 3
National Weather Service St. Louis	National Weather Service St. Louis
Forecast Low Temperatures Day 4	Forecast Low Temperatures Day 5
National Weather Service St. Louis	National Weather Service St. Louis
Forecast Low Temperatures Day 6	Forecast Low Temperatures Day 7
National Weather Service St. Louis	National Weather Service St. Louis
6–10 Day Temperature Outlook	8–14 Day Temperature Outlook
Climate Prediction Center	Climate Prediction Center

Climatology (Spring)

				Last Hard Freeze (≤28ºF)				Last Freeze (≤32ºF)				Last Frost (≤36ºF)
Location	ID	Type	State	Earliest	Median	Average	Latest	Earliest	Median	Average	Latest	Earliest	Median	Average	Latest
St. Louis	KSTL	ASOS	MO	2/29	3/26	3/20	4/9	3/9	4/2	4/2	4/18	3/22	4/12	4/11	4/29
Columbia	KCOU	ASOS	MO	3/5	3/29	3/29	4/18	3/10	4/8	4/8	4/29	4/5	4/22	4/22	5/18
Quincy	KUIN	ASOS	IL	3/5	4/1	4/1	4/20	3/24	4/11	4/12	5/3	4/12	4/28	4/28	5/18
Chesterfield	KSUS	ASOS	MO	3/6	4/1	3/31	4/20	3/16	4/11	4/11	5/6	4/1	4/23	4/24	5/17
Cahokia*	KCPS	ASOS	IL	3/5	3/26	3/24	4/17	3/10	4/9	4/8	4/29	3/30	4/21	4/22	5/9
St. Charles*	KSET	ASOS	MO	3/6	3/24	3/24	4/9	3/19	4/10	4/8	4/23	3/22	4/18	4/20	5/9
Jefferson City*	KJEF	ASOS	MO	3/5	3/24	3/24	4/17	3/15	4/12	4/10	4/29	4/7	4/23	4/24	5/17
Farmington*	KFAM	ASOS	MO	3/10	4/2	4/4	4/28	3/26	4/10	4/13	5/7	4/6	4/23	4/23	5/16
Belleville SIU Res.	SIUI2	COOP	IL	3/10	3/31	4/1	4/28	3/19	4/11	4/10	4/29	3/23	4/24	4/26	5/18
Hillsboro*	HLBI2	COOP	IL	3/5	3/30	3/29	4/15	3/20	4/12	4/9	4/29	4/1	4/23	4/25	5/18
Jerseyville	JVLI2	COOP	IL	3/19	4/3	4/4	4/20	3/23	4/13	4/13	5/6	4/1	4/27	4/27	5/20
Ramsey	RAMI2	COOP	IL	3/17	4/3	4/4	4/18	3/28	4/14	4/14	5/5	3/31	4/25	4/28	5/27
Salem	SLOI2	COOP	IL	3/7	3/29	3/27	4/18	3/10	4/9	4/7	4/28	3/31	4/20	4/21	5/18
White Hall	WHLI2	COOP	IL	3/6	4/3	4/1	4/20	3/23	4/13	4/12	5/4	3/31	4/23	4/25	5/18
California	CALM7	COOP	MO	3/5	4/4	4/1	4/20	3/16	4/9	4/9	5/4	4/7	4/21	4/23	5/18
Elsberry	EBYM7	COOP	MO	3/5	4/5	4/3	4/20	3/27	4/18	4/18	5/21	4/14	4/27	4/29	5/21
Hannibal WP	HNNM7	COOP	MO	3/6	3/29	3/30	4/17	3/10	4/10	4/11	5/3	3/30	4/16	4/18	5/5
Jefferson City WP	JWPM7	COOP	MO	3/3	3/25	3/24	4/15	3/10	4/5	4/4	4/21	3/17	4/16	4/17	5/7
Rosebud*	RSEM7	COOP	MO	3/16	4/12	4/11	5/4	4/3	4/23	4/25	5/18	4/20	5/8	5/7	5/22
Based on 1991–2020 climatological data. *More than 5 years with seasons including more than 5 days with missing data—use with caution.

Hard Freeze (≤28ºF)
Earliest	Median	Latest
Midwest Regional Climate Center	Midwest Regional Climate Center	Midwest Regional Climate Center
Freeze (≤32ºF)
Earliest	Median	Latest
Midwest Regional Climate Center	Midwest Regional Climate Center	Midwest Regional Climate Center

Climatology (Fall)

				First Hard Freeze (≤28ºF)				First Freeze (≤32ºF)				First Frost (≤36ºF)
Location	ID	Type	State	Earliest	Median	Average	Latest	Earliest	Median	Average	Latest	Earliest	Median	Average	Latest
St. Louis	KSTL	ASOS	MO	11/1	11/15	11/15	12/9	10/7	11/1	11/2	11/27	10/7	10/21	10/23	11/13
Columbia	KCOU	ASOS	MO	10/7	11/1	11/3	11/8	10/7	10/22	10/23	11/20	9/19	10/13	10/14	11/10
Quincy	KUIN	ASOS	IL	10/7	10/31	10/31	11/26	10/2	10/19	10/20	11/12	9/19	10/11	10/11	10/30
Chesterfield	KSUS	ASOS	MO	10/9	10/31	10/31	11/22	9/23	10/21	10/19	11/10	9/21	10/7	10/9	10/28
Cahokia*	KCPS	ASOS	IL	10/9	11/1	11/2	11/27	10/5	10/21	10/21	11/12	9/25	10/12	10/12	11/10
St. Charles*	KSET	ASOS	MO	10/16	11/2	11/6	12/3	10/2	10/18	10/22	11/10	9/22	10/11	10/11	10/30
Jefferson City*	KJEF	ASOS	MO	10/9	11/1	11/2	11/27	10/7	10/26	10/23	11/10	9/29	10/13	10/14	10/30
Farmington*	KFAM	ASOS	MO	9/22	10/28	10/26	11/25	9/22	10/21	10/18	11/5	9/21	10/8	10/9	10/28
Belleville SIU Res.	SIUI2	COOP	IL	9/23	10/27	10/26	11/25	9/20	10/14	10/14	11/10	9/19	10/9	10/8	11/6
Hillsboro*	HLBI2	COOP	IL	10/16	11/3	11/6	12/9	9/21	10/18	10/18	11/11	9/19	10/12	10/12	11/10
Jerseyville	JVLI2	COOP	IL	10/5	10/29	10/28	11/17	9/21	10/17	10/16	11/10	9/15	10/10	10/7	10/27
Ramsey	RAMI2	COOP	IL	9/23	10/28	10/27	11/25	9/20	10/13	10/14	11/10	9/15	10/6	10/6	10/26
Salem	SLOI2	COOP	IL	10/16	11/4	11/6	12/4	10/7	10/26	10/25	11/13	9/21	10/14	10/14	11/10
White Hall	WHLI2	COOP	IL	10/12	10/28	10/28	11/25	10/5	10/17	10/18	11/10	9/20	10/9	10/9	10/25
California	CALM7	COOP	MO	10/9	11/1	11/3	11/27	10/7	10/26	10/23	11/13	9/19	10/16	10/16	11/10
Elsberry	EBYM7	COOP	MO	10/9	10/31	10/30	11/16	9/23	10/17	10/16	10/31	9/20	10/10	10/8	10/29
Hannibal WP	HNNM7	COOP	MO	10/7	11/3	11/6	11/29	9/29	10/28	10/27	11/22	9/9	10/13	10/12	11/4
Jefferson City WP	JWPM7	COOP	MO	10/24	11/8	11/11	12/9	10/7	10/28	10/27	11/13	9/22	10/17	10/17	11/10
Rosebud*	RSEM7	COOP	MO	10/5	10/26	10/24	11/10	9/23	10/13	10/12	11/6	9/15	10/4	10/3	10/17
Based on 1991–2020 climatological data. *More than 5 years with seasons including more than 5 days with missing data—use with caution.

Hard Freeze (≤28ºF)
Earliest	Median	Latest
Midwest Regional Climate Center	Midwest Regional Climate Center	Midwest Regional Climate Center
Freeze (≤32ºF)
Earliest	Median	Latest
Midwest Regional Climate Center	Midwest Regional Climate Center	Midwest Regional Climate Center

Additional Frost & Freeze Information

Frost & Freeze Definitions

Frost	Thin ice that forms on surfaces when the temperature falls to or below 32ºF and sufficient moisture is available, which can damage many seasonal plants and kill some sensitive seasonal plants during prolonged exposure. Conventional temperature measurements above the surface often only need to be at or below 36ºF for frost to form.
Freeze	When the temperature falls to or below 32ºF, which can significantly damage nearly all seasonal plants and even kill many seasonal plants during prolonged exposure. A freeze can occur without the development of frost.
Hard Freeze	When the temperature falls to or below 28ºF, which can kill nearly all seasonal plants. A hard freeze can occur without the development of frost.

How Does Frost Form?