Fairfield, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00132789, 1951 to 2025, measured from daily minimum temperatures.

Elevation 740 ft, 41.021, -91.955. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 21	Oct 15
Earliest	Mar 27 (1978)	Sep 16 (1999)
Latest	May 10 (1966)	Nov 8 (1956)
Trend	little change (less than half a day per decade)	0.9 days later per decade
Years with data	74	75

At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Oct 26.

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