Windsor, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00119354, 1951 to 2025, measured from daily minimum temperatures.

Elevation 690 ft, 39.446, -88.596. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 17	Oct 21
Earliest	Mar 29 (1999)	Sep 23 (1995)
Latest	May 12 (1981)	Nov 20 (1985)
Trend	1.7 days earlier per decade	0.7 days later per decade
Years with data	69	70

At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Nov 1.

The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.

Chart

Last spring frost (32°F)

First fall frost (32°F)

Dots are single years. The gray line is the median, the green line the fitted trend.

Year by year

Year	Last spring 32°F	First fall 32°F	Last spring 28°F	First fall 28°F
2025	Apr 12	Nov 2	Mar 18	Nov 10
2024	Apr 6	Oct 17	Mar 22	Nov 26
2023	Apr 26	Oct 31	Mar 21	Oct 31
2022	Apr 20	Oct 18	Mar 29	Nov 12
2021	Apr 22	Nov 3	Apr 3	Nov 4
2020	May 9	Oct 16	Apr 17	Oct 16
2019	Apr 2	Nov 1	Apr 1	Nov 1
2018	Apr 29	Oct 17	Apr 17	Oct 21
2017	Apr 7	Oct 29	Mar 23	Oct 30
2016	Apr 10	Nov 12	Apr 10	Nov 20
2015	Apr 5	Oct 18	Mar 29	Nov 8
2014	Apr 17	Nov 1	Mar 31	Nov 2
2013	Apr 21	Oct 22	Apr 5	Oct 25
2012	Apr 12	Oct 31	Apr 12	Nov 4
2011	Apr 1	Nov 11	Mar 28	Nov 11
2009	Apr 12	no data	Mar 30	no data
2008	no data	Oct 28	no data	Oct 28
2007	Apr 15	Nov 1	Apr 13	Nov 7
2006	Apr 9	Oct 12	Mar 26	Oct 12
2005	no data	Oct 28	no data	Nov 16
2003	Apr 13	Oct 2	Mar 30	Oct 2
2002	Apr 6	Oct 14	Apr 6	Oct 14
2001	Apr 19	Oct 17	Mar 28	Nov 20
2000	Apr 12	Oct 7	Apr 8	Nov 15
1999	Mar 29	Oct 24	Mar 27	Oct 24
1998	Apr 5	Nov 4	Mar 15	Nov 5
1997	Apr 18	Oct 22	Apr 14	Oct 22
1996	Apr 14	Oct 11	Apr 10	Nov 2
1995	Apr 5	Sep 23	Apr 5	Nov 3
1994	Apr 7	Oct 11	Apr 7	Nov 23
1993	no data	Oct 10	no data	Oct 31
1992	Apr 28	Oct 17	Apr 5	Oct 19
1991	Mar 31	Oct 16	Mar 30	Oct 20
1990	Apr 18	Oct 19	Apr 12	Oct 26
1989	May 7	Sep 24	Apr 13	Nov 3
1988	Apr 16	Oct 6	Mar 21	Oct 13
1987	Apr 9	Oct 8	Apr 9	Oct 8
1986	Apr 22	Nov 10	Mar 22	Nov 10
1985	Apr 9	Nov 20	Apr 9	Nov 20
1984	Apr 2	Nov 2	Mar 23	Nov 2
1983	May 9	Nov 4	Apr 20	Nov 11
1982	Apr 21	Oct 21	Apr 9	Oct 21
1981	May 12	Oct 23	Mar 23	Oct 24
1980	Apr 14	Oct 5	Mar 22	Oct 29
1979	Apr 10	Oct 10	Apr 10	Oct 26
1978	May 3	Oct 17	Mar 18	Oct 24
1977	Apr 29	Oct 13	Mar 24	Nov 11
1976	May 8	Oct 16	Apr 12	Oct 16
1975	Apr 13	Oct 30	Apr 7	Nov 14
1974	Apr 9	no data	Apr 9	no data
1973	Apr 14	Nov 3	Apr 13	Nov 6
1972	Apr 9	Oct 15	Apr 9	Oct 19
1971	Apr 30	Nov 4	Apr 7	Nov 4
1970	Apr 7	Oct 16	Apr 5	Nov 14
1969	Apr 24	Oct 17	Mar 31	Oct 23
1968	Apr 27	Oct 25	Apr 1	Oct 29
1967	Apr 24	Oct 26	Mar 22	Nov 4
1966	May 10	Oct 23	May 10	Oct 30
1965	Apr 3	Oct 29	Mar 25	Oct 29
1964	no data	Oct 7	no data	Oct 10
1963	May 1	Oct 29	Apr 10	Nov 2
1962	Apr 20	Oct 24	Apr 20	Oct 24
1961	Apr 17	Oct 27	Apr 16	Nov 4
1960	May 12	Oct 20	Apr 10	Oct 20
1959	Apr 22	no data	Apr 13	no data
1958	May 7	Oct 1	Mar 31	Nov 7
1957	May 4	Oct 11	Apr 14	Oct 26
1956	Apr 24	Nov 8	Apr 23	Nov 9
1955	Apr 8	Oct 25	Mar 29	Nov 3
1954	May 4	Oct 19	Apr 3	Nov 1
1953	Apr 20	Oct 29	Apr 20	Nov 5
1952	Apr 16	Oct 3	Apr 11	Oct 6
1951	Apr 23	Oct 20	Apr 17	Nov 1

"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.