Walnut, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00118916, 1951 to 2025, measured from daily minimum temperatures.

Elevation 671 ft, 41.560, -89.603. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 25	Oct 11
Earliest	Mar 29 (1999)	Sep 20 (1956)
Latest	May 28 (1965)	Nov 9 (2016)
Trend	1.0 days earlier per decade	1.3 days later per decade
Years with data	71	72

At 28°F (hard freeze) the median last spring date is Apr 13 and the median first fall date is Oct 22.

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 16	Oct 23	Apr 8	Oct 24
2024	Apr 25	Oct 15	Apr 21	Oct 16
2023	Apr 26	Oct 30	Apr 26	Oct 30
2022	Apr 20	Oct 8	Apr 19	Oct 18
2021	Apr 22	Oct 23	Apr 21	Nov 3
2020	May 10	Oct 16	Apr 16	Oct 28
2019	Apr 28	Oct 12	Apr 15	Oct 31
2018	Apr 29	Oct 12	Apr 29	Oct 18
2017	Apr 7	Oct 29	Mar 23	Oct 29
2016	Apr 13	Nov 9	Apr 12	Nov 12
2015	Apr 24	Oct 17	Apr 24	Oct 17
2014	Apr 19	Oct 11	Apr 16	Nov 1
2013	Apr 20	Oct 22	Apr 4	Oct 22
2012	no data	Oct 6	no data	Oct 27
2011	May 3	Oct 20	Mar 30	Nov 10
2010	Apr 7	Oct 3	Mar 28	Oct 28
2009	Apr 14	Oct 9	Apr 6	Oct 10
2008	no data	Oct 27	no data	Oct 27
2007	no data	Oct 27	no data	Nov 1
2006	Apr 25	Oct 11	Apr 7	Oct 11
2005	May 3	Oct 15	May 3	Oct 22
2004	May 2	Oct 4	Apr 13	Oct 4
2003	Apr 12	Oct 1	Apr 9	Oct 1
2002	May 20	Oct 13	Apr 5	Oct 15
2001	Apr 18	Sep 24	Apr 17	Oct 16
2000	Apr 13	Oct 6	Apr 12	Oct 6
1999	Mar 29	Oct 14	Mar 27	Oct 18
1998	Apr 17	Oct 14	Apr 5	Oct 22
1997	May 16	Oct 14	Apr 17	Oct 22
1996	Apr 27	Oct 11	Apr 16	Oct 19
1995	Apr 25	Sep 23	Apr 6	Nov 3
1994	Apr 22	Oct 10	Apr 8	Oct 27
1993	Apr 22	Sep 30	Apr 6	Oct 10
1992	May 27	Oct 17	Apr 5	Oct 17
1991	Apr 11	Sep 20	Mar 31	Oct 15
1990	Apr 18	Oct 11	Apr 18	Oct 19
1989	no data	Sep 23	no data	Oct 4
1988	Apr 28	Oct 5	Apr 21	Oct 6
1987	Apr 9	Oct 3	Apr 8	Oct 3
1986	May 3	Oct 15	Apr 23	Nov 3
1985	Apr 10	Oct 1	Apr 10	Nov 5
1984	Apr 24	Sep 25	Mar 31	Oct 1
1983	May 9	Sep 22	Apr 20	Oct 14
1982	Apr 27	no data	Apr 21	no data
1981	Apr 21	Oct 8	Apr 6	Oct 19
1980	May 9	no data	Apr 13	no data
1979	Apr 10	Oct 13	Apr 7	Oct 13
1978	May 2	Oct 8	May 1	Nov 14
1977	Apr 29	Oct 13	Apr 6	Nov 11
1976	May 3	Oct 6	May 2	Oct 16
1975	Apr 21	Sep 26	Apr 12	Oct 2
1974	May 6	Sep 22	Apr 24	Oct 2
1973	Apr 28	Oct 30	Apr 13	Nov 3
1972	Apr 26	Sep 30	Apr 25	Oct 19
1971	May 3	Nov 3	Apr 24	Nov 4
1970	Apr 10	Oct 10	Apr 2	Oct 16
1969	Apr 29	Oct 14	Apr 6	Oct 23
1968	Apr 25	Oct 4	Apr 6	Oct 25
1967	Apr 25	Sep 29	Apr 24	Oct 26
1966	May 10	Oct 2	May 10	Oct 24
1965	May 28	Oct 24	Mar 31	Oct 24
1964	Apr 15	Oct 6	Apr 9	Oct 10
1963	May 1	Oct 29	Apr 12	Nov 2
1962	Apr 20	Oct 23	Apr 20	Oct 24
1961	May 2	Sep 28	May 1	Nov 3
1960	May 12	Oct 20	Apr 10	Oct 20
1959	Apr 22	no data	Apr 22	no data
1958	May 6	Oct 1	Apr 29	Nov 6
1957	May 4	Oct 18	Apr 15	Oct 20
1956	Apr 30	Sep 20	Apr 24	Nov 8
1955	Apr 7	Oct 19	Mar 29	Nov 3
1954	May 7	Oct 19	Apr 4	Oct 30
1953	Apr 27	Oct 7	Apr 20	Oct 29
1952	Apr 16	Oct 3	Apr 11	Oct 6
1951	Apr 23	Sep 28	Apr 19	Oct 31

"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.