Morrison, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00115833, 1951 to 2025, measured from daily minimum temperatures.

Elevation 632 ft, 41.794, -89.968. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 10
Earliest	Apr 2 (1991)	Sep 20 (1956)
Latest	May 29 (1965)	Nov 3 (1973)
Trend	little change (less than half a day per decade)	1.0 days later per decade
Years with data	70	73

At 28°F (hard freeze) the median last spring date is Apr 15 and the median first fall date is Oct 19.

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