Shasta Dam, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00048135, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,075 ft, 40.714, -122.416. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 1	Dec 12
Earliest	Jan 1 (2022)	Nov 13 (1955)
Latest	Apr 23 (2003)	Dec 31 (1959)
Trend	2.2 days earlier per decade	little change (less than half a day per decade)
Years with data	70, 7 with no freeze	69, 24 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 28 and the median first fall date is Dec 16.

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

"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.