Osceola, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00136316, 1951 to 2024, measured from daily minimum temperatures.

Elevation 1,028 ft, 41.019, -93.750. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 10
Earliest	Mar 26 (1998)	Sep 15 (2007)
Latest	May 17 (2014)	Nov 8 (1956)
Trend	1.2 days later per decade	0.9 days earlier per decade
Years with data	68	66

At 28°F (hard freeze) the median last spring date is Apr 13 and the median first fall date is Oct 21.

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

"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.