Muscatine, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00135837, 1951 to 2025, measured from daily minimum temperatures.

Elevation 549 ft, 41.407, -91.073. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 21	Oct 15
Earliest	Mar 24 (1998)	Sep 20 (1991)
Latest	May 10 (2020)	Nov 8 (1956)
Trend	little change (less than half a day per decade)	0.9 days later per decade
Years with data	73	74

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