Perry, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00136566, 1951 to 2025, measured from daily minimum temperatures.

Elevation 950 ft, 41.839, -94.111. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 6
Earliest	Apr 6 (1987)	Sep 12 (1955)
Latest	May 23 (1963)	Oct 31 (2015)
Trend	little change (less than half a day per decade)	1.3 days later per decade
Years with data	66	70

At 28°F (hard freeze) the median last spring date is Apr 13 and the median first fall date is Oct 16.

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