Livermore, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00044997, 1951 to 2025, measured from daily minimum temperatures.

Elevation 393 ft, 37.693, -121.814. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 7	Nov 26
Earliest	Jan 1 (2016)	Oct 24 (1956)
Latest	May 5 (1952)	Dec 30 (2025)
Trend	7.1 days earlier per decade	3.2 days later per decade
Years with data	70, 1 with no freeze	69, 3 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 27 and the median first fall date is Dec 6.

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

"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.