Logan, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00134894, 1951 to 2025, measured from daily minimum temperatures.

Elevation 990 ft, 41.638, -95.788. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 7
Earliest	Apr 6 (1977)	Sep 19 (1991)
Latest	May 17 (2014)	Nov 5 (1998)
Trend	little change (less than half a day per decade)	0.8 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 15.

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