Clinton #1, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00131635, 1951 to 2025, measured from daily minimum temperatures.

Elevation 585 ft, 41.795, -90.264. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 24	Oct 12
Earliest	Apr 5 (1995)	Sep 18 (1959)
Latest	May 23 (1963)	Nov 9 (2016)
Trend	0.9 days earlier per decade	1.3 days later per decade
Years with data	74	75

At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 22.

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