Charleston, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00111436, 1951 to 2025, measured from daily minimum temperatures.

Elevation 700 ft, 39.476, -88.165. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 18	Oct 17
Earliest	Mar 22 (1967)	Sep 20 (1991)
Latest	May 16 (1959)	Nov 11 (2011)
Trend	little change (less than half a day per decade)	1.0 days earlier per decade
Years with data	70	68

At 28°F (hard freeze) the median last spring date is Apr 6 and the median first fall date is Nov 2.

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	Oct 24	Apr 8	Nov 10
2024	Apr 21	Oct 16	Apr 6	Oct 17
2023	Apr 24	Oct 12	Apr 24	Oct 31
2022	Apr 19	Oct 9	Mar 31	Oct 19
2021	Apr 21	no data	Apr 16	no data
2020	May 9	Oct 5	Apr 18	Oct 16
2019	Apr 15	Oct 12	Apr 1	Nov 1
2018	Apr 30	no data	Apr 30	no data
2016	Apr 9	Oct 22	Apr 9	Nov 13
2015	Apr 24	Oct 17	Mar 30	Nov 8
2014	Apr 16	Oct 11	Mar 29	Nov 2
2013	Apr 21	no data	Apr 3	no data
2012	Apr 11	Oct 8	Apr 11	Nov 13
2011	Mar 31	Nov 11	Mar 28	Nov 11
2010	May 8	Oct 29	Mar 26	Nov 3
2009	no data	Oct 11	no data	Nov 27
2007	Apr 16	Oct 28	Apr 10	Nov 7
2006	Apr 10	Oct 12	Mar 26	Oct 15
2005	May 3	Oct 28	Mar 17	Nov 16
2004	Apr 14	Oct 3	Mar 22	Nov 13
2003	Apr 11	Oct 2	Mar 30	Oct 2
2002	Apr 7	Oct 14	Apr 5	Nov 2
2001	Apr 18	Oct 7	Apr 18	Oct 28
2000	Apr 21	Oct 7	Apr 11	Oct 9
1999	Mar 29	Oct 5	Mar 27	Oct 24
1998	Apr 5	Oct 22	Mar 24	Nov 5
1997	Apr 18	Oct 18	Apr 14	Oct 22
1996	Apr 17	Oct 11	Apr 10	Nov 2
1995	Apr 2	Oct 25	Apr 1	Nov 3
1994	May 2	Oct 26	Apr 7	Nov 22
1993	Apr 22	Oct 22	Apr 2	Nov 1
1992	Apr 28	Oct 17	Apr 5	Nov 8
1991	Apr 22	Sep 20	Mar 30	Oct 16
1990	Apr 18	Oct 11	Apr 12	Oct 26
1989	May 7	Oct 19	Apr 11	Nov 2
1988	Apr 20	Oct 6	Mar 27	Oct 12
1987	Apr 9	Oct 8	Apr 9	Oct 8
1986	Apr 23	Nov 3	Mar 22	Nov 10
1985	Apr 10	Oct 2	Apr 9	Nov 20
1984	Apr 7	Nov 2	Mar 25	Nov 2
1983	Apr 25	Nov 4	Apr 20	Nov 12
1982	Apr 21	Oct 21	Apr 11	Oct 21
1981	May 12	Oct 23	Apr 6	Oct 24
1980	Apr 25	Oct 5	Mar 22	Oct 29
1979	Apr 10	Oct 10	Apr 10	Oct 14
1978	May 2	Oct 8	Mar 18	Nov 8
1977	Apr 6	Oct 13	Mar 24	Nov 11
1976	May 8	Oct 16	Apr 12	Oct 18
1975	Apr 13	Oct 26	Apr 12	Nov 14
1974	Apr 9	Sep 23	Apr 9	Oct 3
1973	Apr 13	Nov 3	Apr 11	Nov 6
1972	Apr 9	Oct 19	Apr 8	Oct 19
1971	Apr 6	Nov 4	Apr 5	Nov 7
1970	Apr 7	no data	Mar 29	no data
1969	Apr 1	Oct 17	Mar 31	Oct 23
1968	Apr 5	Oct 5	Mar 23	Nov 12
1967	Mar 22	Oct 26	Mar 22	Nov 4
1966	May 10	Oct 25	Apr 10	Nov 2
1965	Apr 2	Oct 29	Mar 27	Nov 18
1964	Apr 9	Oct 10	Apr 1	Nov 6
1963	Apr 24	Nov 2	Mar 22	Nov 2
1962	Apr 20	Oct 24	Apr 16	Oct 24
1961	Apr 17	Nov 4	Apr 16	Nov 4
1960	Apr 18	Oct 20	Apr 9	Oct 20
1959	May 16	Oct 14	Apr 13	Oct 18
1958	May 7	Oct 1	Apr 12	Oct 30
1957	Apr 15	Oct 11	Apr 15	Oct 12
1956	Apr 24	Oct 27	Apr 23	Nov 9
1955	Apr 8	Oct 25	Mar 29	Nov 3
1954	May 4	Oct 19	Apr 1	Oct 31
1953	no data	Oct 29	no data	Nov 5
1952	Apr 16	no data	Apr 11	no data
1951	no data	Oct 20	no data	Nov 3

"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.