Olga 2 Se, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00456096, 1951 to 2015, measured from daily minimum temperatures.

Elevation 80 ft, 48.612, -122.806. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 22	Nov 17
Earliest	Jan 2 (2015)	Oct 4 (2012)
Latest	May 1 (1954)	Dec 23 (1974)
Trend	4.2 days earlier per decade	1.2 days earlier per decade
Years with data	63	62, 1 with no freeze

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

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