Rantoul, IL: frost dates by year

Last spring and first fall frost at NOAA station USW00014806, 1951 to 2023, measured from daily minimum temperatures.

Elevation 740 ft, 40.313, -88.159. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 20	Oct 15
Earliest	Apr 3 (1965)	Sep 23 (1989)
Latest	May 21 (2002)	Nov 12 (2016)
Trend	little change (less than half a day per decade)	little change (less than half a day per decade)
Years with data	64	62

At 28°F (hard freeze) the median last spring date is Apr 9 and the median first fall date is Oct 27.

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

"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.