Anacortes, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00450176, 1951 to 2014, measured from daily minimum temperatures.

Elevation 20 ft, 48.512, -122.614. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 21	Nov 11
Earliest	Jan 7 (1953)	Oct 14 (1970)
Latest	Apr 22 (1972)	Dec 26 (1999)
Trend	2.8 days earlier per decade	2.2 days later per decade
Years with data	57	53, 1 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 17 and the median first fall date is Nov 24.

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

"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.