La Harpe, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00114823, 1951 to 2025, measured from daily minimum temperatures.

Elevation 690 ft, 40.584, -90.969. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 22	Oct 13
Earliest	Apr 1 (1984)	Sep 22 (1983)
Latest	May 20 (1954)	Nov 12 (2016)
Trend	0.5 days earlier per decade	1.0 days later per decade
Years with data	72	75

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