Winters, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00049742, 1951 to 2025, measured from daily minimum temperatures.

Elevation 135 ft, 38.525, -121.978. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 11	Nov 28
Earliest	Jan 1 (2000)	Nov 10 (2020)
Latest	Apr 27 (1955)	Dec 29 (2025)
Trend	1.4 days earlier per decade	1.2 days later per decade
Years with data	75, 2 with no freeze	74, 6 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 17 and the median first fall date is Dec 14.

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	Feb 11	Dec 29	Jan 28	none
2024	Apr 6	Nov 30	none	none
2023	Apr 4	Nov 26	none	Nov 27
2022	Mar 6	Nov 14	Feb 25	Nov 30
2021	Mar 1	Dec 11	Jan 26	none
2020	Feb 10	Nov 10	none	none
2019	Feb 23	Nov 30	Feb 6	none
2018	Mar 18	Nov 12	Feb 25	none
2017	Feb 24	Dec 6	none	Dec 22
2016	Jan 2	Dec 6	none	Dec 19
2015	Jan 5	Nov 25	Jan 3	Nov 29
2014	Feb 5	Dec 27	none	none
2013	Feb 20	Dec 5	Jan 21	Dec 5
2012	Jan 18	Nov 11	Jan 17	Dec 19
2011	Feb 27	Dec 6	Jan 10	Dec 24
2010	none	Nov 26	none	none
2009	Jan 11	Dec 3	Jan 4	Dec 8
2008	Jan 19	Dec 9	none	Dec 18
2007	Feb 28	Dec 1	Jan 16	none
2006	Mar 11	Nov 30	none	Dec 19
2005	Jan 14	Dec 5	none	none
2004	Jan 23	Nov 30	Jan 4	Nov 30
2003	Feb 10	Nov 23	Feb 9	Dec 27
2002	Mar 8	none	Jan 31	none
2001	Feb 1	none	Jan 18	none
2000	Jan 1	Nov 12	none	none
1999	Feb 11	Dec 15	none	none
1998	Jan 5	Dec 4	none	Dec 21
1997	Jan 15	Dec 20	Jan 14	Dec 26
1996	Feb 26	Dec 19	none	Dec 19
1995	Mar 24	none	none	none
1994	Feb 14	Nov 14	none	Dec 9
1993	Jan 26	Nov 24	Jan 11	Nov 25
1992	Jan 16	Dec 5	Jan 13	none
1991	Jan 30	Nov 16	Jan 4	none
1990	Feb 20	Nov 24	Jan 21	Dec 20
1989	Feb 15	Nov 29	Feb 14	Dec 12
1988	Feb 5	Nov 30	Feb 4	Dec 26
1987	Jan 21	Nov 27	Jan 18	Dec 26
1986	Feb 10	Dec 1	none	Dec 10
1985	Feb 10	Nov 13	Jan 4	Nov 13
1984	Jan 20	Dec 16	Jan 14	Dec 23
1983	Feb 4	none	none	none
1982	Feb 12	Dec 19	Jan 9	Dec 31
1981	Jan 31	none	none	none
1980	Jan 30	Dec 9	none	Dec 10
1979	Feb 4	Nov 21	Jan 1	none
1978	none	Nov 15	none	Nov 15
1977	Mar 14	Nov 19	Jan 9	none
1976	Mar 5	Nov 29	Jan 3	Dec 24
1975	Feb 23	Nov 22	Jan 29	Dec 15
1974	Mar 9	Dec 18	Jan 9	Dec 25
1973	Jan 28	none	Jan 7	none
1972	Feb 3	Dec 5	Feb 1	Dec 5
1971	Mar 6	Dec 9	Jan 7	Dec 15
1970	Feb 8	Dec 12	Jan 6	Dec 25
1969	Mar 13	Nov 27	Jan 31	Nov 29
1968	Feb 1	Dec 3	Jan 6	Dec 21
1967	Jan 9	Nov 25	none	Dec 2
1966	Mar 4	Nov 24	Jan 18	Dec 28
1965	Feb 12	Nov 26	Jan 1	Dec 15
1964	Feb 27	Nov 17	Jan 9	Nov 19
1963	Jan 27	Nov 22	Jan 25	Dec 12
1962	Feb 28	Nov 30	Jan 26	Dec 26
1961	Jan 22	Nov 17	Jan 21	Dec 10
1960	Jan 18	Nov 28	Jan 5	Dec 8
1959	Feb 13	Nov 17	Jan 4	Dec 7
1958	Jan 23	Nov 17	none	Nov 17
1957	Feb 5	Nov 23	Feb 5	none
1956	Mar 2	Nov 21	Feb 18	Dec 7
1955	Apr 27	Nov 15	Feb 28	none
1954	Apr 2	Nov 30	Jan 25	Nov 30
1953	Mar 14	Nov 20	none	Dec 23
1952	Mar 20	no data	Jan 10	no data
1951	Mar 11	Nov 23	Mar 10	Dec 9

"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.