Keosauqua, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00134389, 1951 to 2025, measured from daily minimum temperatures.

Elevation 629 ft, 40.736, -91.970. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 23	Oct 11
Earliest	Apr 6 (2002)	Sep 16 (1984)
Latest	May 23 (1963)	Nov 8 (1956)
Trend	0.9 days earlier per decade	1.3 days later per decade
Years with data	71	72

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