Fairfield, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00042934, 1951 to 2025, measured from daily minimum temperatures.

Elevation 40 ft, 38.274, -122.068. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 13	Dec 1
Earliest	Jan 1 (2016)	Oct 6 (2011)
Latest	Jun 9 (2011)	Dec 26 (2000)
Trend	4.4 days earlier per decade	2.3 days later per decade
Years with data	72, 10 with no freeze	65, 8 with no freeze

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