Shenandoah, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00137613, 1951 to 2025, measured from daily minimum temperatures.

Elevation 999 ft, 40.772, -95.357. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 24	Oct 10
Earliest	Mar 30 (2010)	Sep 17 (1980)
Latest	May 22 (1963)	Nov 6 (1998)
Trend	1.0 days earlier per decade	1.0 days later per decade
Years with data	72	74

At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Oct 24.

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