Clarinda, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00131533, 1951 to 2025, measured from daily minimum temperatures.

Elevation 980 ft, 40.724, -95.019. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 25	Oct 7
Earliest	Apr 6 (1977)	Sep 16 (2011)
Latest	May 16 (2014)	Nov 2 (1985)
Trend	little change (less than half a day per decade)	0.8 days later per decade
Years with data	72	73

At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 20.

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

"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.