Willows 6 W, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00049699, 1951 to 2025, measured from daily minimum temperatures.

Elevation 234 ft, 39.523, -122.305. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 15	Nov 24
Earliest	Jan 2 (2016)	Nov 4 (1973)
Latest	May 21 (2002)	Dec 30 (2018)
Trend	2.1 days earlier per decade	1.4 days later per decade
Years with data	67, 1 with no freeze	66, 4 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 10 and the median first fall date is Dec 10.

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

"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.