Winnebago, MN: frost dates by year

Last spring and first fall frost at NOAA station USC00219046, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,110 ft, 43.764, -94.166. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 29	Oct 6
Earliest	Apr 5 (1987)	Sep 15 (2007)
Latest	May 26 (1984)	Oct 29 (1963)
Trend	1.1 days earlier per decade	0.7 days later per decade
Years with data	73	75

At 28°F (hard freeze) the median last spring date is Apr 18 and the median first fall date is Oct 17.

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

"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.