Park Forest, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00116616, 1952 to 2025, measured from daily minimum temperatures.

Elevation 710 ft, 41.495, -87.680. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 15
Earliest	Mar 31 (1999)	Sep 23 (1974)
Latest	May 27 (1992)	Nov 12 (2016)
Trend	1.3 days earlier per decade	little change (less than half a day per decade)
Years with data	71	70

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