Colusa 2 Ssw, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00041948, 1951 to 2024, measured from daily minimum temperatures.

Elevation 50 ft, 39.188, -122.027. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 3	Nov 19
Earliest	Jan 3 (2015)	Oct 11 (2023)
Latest	May 4 (2020)	Dec 25 (1962)
Trend	4.1 days earlier per decade	0.7 days later per decade
Years with data	63, 2 with no freeze	68, 5 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 5 and the median first fall date is Dec 2.

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

"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.