Redwood City, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00047339, 1951 to 2025, measured from daily minimum temperatures.

Elevation 31 ft, 37.477, -122.239. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 6	Dec 6
Earliest	Jan 1 (2016)	Nov 13 (1985)
Latest	Mar 25 (1964)	Dec 30 (2020)
Trend	1.3 days earlier per decade	1.5 days later per decade
Years with data	68, 9 with no freeze	70, 16 with no freeze

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