Genoa Dam 8, WI: frost dates by year

Last spring and first fall frost at NOAA station USC00473038, 1951 to 2025, measured from daily minimum temperatures.

Elevation 639 ft, 43.571, -91.229. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 12
Earliest	Mar 27 (1999)	Sep 20 (1956)
Latest	May 27 (1983)	Nov 12 (2016)
Trend	1.3 days earlier per decade	1.2 days later per decade
Years with data	72	73

At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 27.

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

"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.