Ft Madison, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00133007, 1953 to 2025, measured from daily minimum temperatures.

Elevation 530 ft, 40.622, -91.334. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 15	Oct 20
Earliest	Mar 22 (2017)	Sep 23 (1983)
Latest	May 14 (1971)	Nov 16 (1994)
Trend	1.8 days earlier per decade	0.9 days later per decade
Years with data	68	71

At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Nov 2.

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

"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.