Red Oak, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00136940, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,040 ft, 41.004, -95.242. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 6
Earliest	Apr 8 (1955)	Sep 15 (1979)
Latest	May 23 (1963)	Nov 5 (1998)
Trend	0.8 days earlier per decade	1.6 days later per decade
Years with data	72	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 8	Oct 22	Apr 8	Nov 2
2024	Apr 21	Oct 15	Apr 20	Oct 16
2023	May 3	Oct 16	Apr 23	Oct 16
2022	Apr 27	Oct 8	Apr 27	Oct 8
2021	May 5	Oct 22	Apr 23	Nov 2
2020	May 12	Oct 2	Apr 16	Oct 24
2019	Apr 15	no data	Apr 14	no data
2018	Apr 20	Oct 15	Apr 20	Oct 21
2017	Apr 12	Oct 28	Mar 19	Oct 28
2016	Apr 13	Oct 13	Apr 13	Nov 12
2015	Apr 24	Oct 30	Mar 28	Nov 13
2014	May 16	Oct 11	Apr 16	Nov 1
2013	May 12	Oct 19	Apr 25	Oct 25
2012	Apr 12	Sep 23	Mar 10	Oct 6
2011	May 4	Oct 19	Apr 5	Oct 21
2010	no data	Oct 19	no data	Oct 29
2009	Apr 15	Oct 4	Apr 14	Oct 10
2008	Apr 26	Oct 16	Apr 15	Oct 28
2007	Apr 16	Oct 23	Apr 10	Nov 1
2006	Apr 9	Oct 12	Apr 8	Oct 13
2005	May 4	Sep 29	Apr 2	Oct 25
2004	May 4	Oct 2	Apr 14	Oct 2
2003	Apr 10	Sep 29	Apr 10	Nov 5
2002	Apr 22	Oct 7	Apr 5	Oct 20
2001	Apr 25	Oct 6	Apr 2	Oct 27
2000	Apr 13	Oct 6	Apr 13	Oct 7
1999	Apr 19	Oct 4	Apr 19	Oct 4
1998	Apr 19	Nov 5	Apr 18	Nov 6
1997	May 13	Oct 14	May 13	Oct 27
1996	Apr 23	Oct 22	Apr 23	Nov 1
1995	May 2	Sep 22	Apr 13	Sep 22
1994	Apr 30	Oct 9	Apr 7	Oct 25
1993	Apr 21	Sep 15	Apr 9	Oct 10
1992	May 6	Sep 29	Apr 22	Oct 11
1991	Apr 10	Sep 19	Apr 10	Oct 6
1990	Apr 30	Oct 10	Apr 17	Oct 10
1989	May 7	Oct 7	Apr 19	Oct 20
1988	Apr 28	Oct 4	Apr 19	Oct 5
1987	Apr 12	Oct 3	Apr 12	Oct 3
1986	Apr 22	Oct 6	Apr 22	Oct 13
1985	Apr 15	Oct 1	Apr 9	Oct 1
1984	May 8	Sep 26	Apr 6	Sep 26
1983	May 15	no data	Apr 18	no data
1982	no data	Oct 16	no data	Oct 21
1981	May 11	Sep 18	May 11	Oct 2
1980	May 9	Sep 17	Apr 15	Oct 3
1979	Apr 28	Sep 15	Apr 28	Oct 5
1978	May 3	Oct 4	May 2	Oct 7
1977	Apr 26	Oct 3	Apr 26	Oct 16
1976	May 8	Oct 6	May 7	Oct 6
1975	May 1	Sep 25	Apr 20	Oct 16
1974	Apr 17	Sep 22	Apr 15	Oct 1
1973	May 15	Sep 18	Apr 13	Oct 29
1972	Apr 25	Sep 30	Apr 8	Oct 19
1971	May 3	Oct 10	Apr 7	Oct 31
1970	May 2	Oct 10	May 2	Oct 15
1969	no data	Oct 14	no data	Oct 14
1968	May 5	Oct 4	Apr 5	Oct 4
1967	May 3	Sep 28	May 2	Oct 11
1966	May 9	Oct 1	May 1	Oct 16
1965	Apr 28	Sep 24	Apr 28	Oct 24
1964	Apr 9	Sep 28	Apr 9	Oct 9
1963	May 23	Oct 28	Apr 4	Oct 29
1962	Apr 17	Oct 24	Apr 16	Oct 24
1961	May 2	Sep 28	May 2	Oct 20
1960	Apr 30	Oct 19	Apr 10	Oct 20
1959	May 15	Oct 9	Apr 22	Nov 5
1958	Apr 29	Oct 1	Apr 29	Oct 26
1957	Apr 14	Oct 18	Apr 14	Oct 25
1956	Apr 30	Oct 7	Apr 24	Nov 8
1955	Apr 8	Oct 8	Apr 7	Oct 15
1954	May 7	Oct 16	Apr 8	Oct 30
1953	Apr 27	Sep 22	Apr 20	Oct 27
1952	Apr 16	Oct 3	Apr 15	Oct 6
1951	Apr 23	Sep 28	Apr 19	Sep 28

"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.