Hanford 1 S, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00043747, 1951 to 2025, measured from daily minimum temperatures.

Elevation 237 ft, 36.316, -119.637. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 26	Nov 24
Earliest	Jan 3 (1995)	Oct 22 (1951)
Latest	May 28 (2019)	Dec 28 (2019)
Trend	5.2 days earlier per decade	3.2 days later per decade
Years with data	72, 1 with no freeze	71, 1 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 3 and the median first fall date is Nov 30.

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

"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.