Osage, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00136305, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,170 ft, 43.279, -92.811. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 30	Oct 6
Earliest	Apr 5 (1987)	Sep 15 (2007)
Latest	May 29 (1965)	Oct 31 (1971)
Trend	1.0 days earlier per decade	0.5 days later per decade
Years with data	73	73

At 28°F (hard freeze) the median last spring date is Apr 15 and the median first fall date is Oct 19.

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