Aledo, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00110072, 1951 to 2025, measured from daily minimum temperatures.

Elevation 730 ft, 41.198, -90.745. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 23	Oct 13
Earliest	Mar 29 (1999)	Sep 20 (1956)
Latest	May 17 (1997)	Nov 12 (2016)
Trend	0.7 days earlier per decade	1.7 days later per decade
Years with data	69	72

At 28°F (hard freeze) the median last spring date is Apr 11 and the median first fall date is Oct 25.

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