Healdsburg, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00043875, 1951 to 2025, measured from daily minimum temperatures.

Elevation 177 ft, 38.629, -122.866. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 19	Nov 29
Earliest	Jan 8 (2000)	Oct 27 (1952)
Latest	Apr 8 (1953)	Dec 27 (1966)
Trend	2.7 days earlier per decade	little change (less than half a day per decade)
Years with data	64, 4 with no freeze	66, 7 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 21 and the median first fall date is Dec 14.

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