Olympia Ap, WA: frost dates by year

Last spring and first fall frost at NOAA station USW00024227, 1951 to 2024, measured from daily minimum temperatures.

Elevation 188 ft, 46.973, -122.903. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 7	Oct 11
Earliest	Apr 10 (1979)	Sep 1 (1973)
Latest	Jun 13 (1976)	Nov 10 (2015)
Trend	1.9 days earlier per decade	1.1 days later per decade
Years with data	74	74

At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 31.

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
2024	May 8	Oct 23	Apr 18	Dec 4
2023	Apr 20	Oct 26	Apr 5	Oct 26
2022	May 11	Oct 23	Apr 17	Nov 8
2021	Apr 15	Oct 11	Apr 12	Oct 31
2020	May 1	Oct 22	Apr 13	Oct 25
2019	Apr 30	Sep 30	Mar 13	Oct 9
2018	Apr 23	Oct 3	Mar 21	Nov 8
2017	Apr 29	Oct 4	Mar 19	Oct 31
2016	Apr 26	Oct 11	Mar 17	Dec 6
2015	Apr 26	Nov 10	Apr 15	Nov 19
2014	Apr 14	Nov 10	Mar 22	Nov 11
2013	May 1	Oct 28	Apr 23	Nov 4
2012	May 19	Oct 3	Apr 7	Oct 5
2011	May 17	Oct 25	Apr 23	Nov 2
2010	May 9	Oct 16	Mar 20	Nov 22
2009	Apr 24	Oct 5	Apr 15	Oct 11
2008	May 12	Oct 11	Apr 26	Oct 11
2007	May 10	Oct 25	Apr 3	Oct 26
2006	May 9	Oct 10	Apr 22	Oct 30
2005	Apr 19	Sep 24	Mar 22	Nov 14
2004	Apr 29	Oct 27	Apr 2	Nov 3
2003	May 18	Oct 31	May 18	Oct 31
2002	May 16	Oct 1	May 7	Oct 12
2001	May 6	Oct 5	Apr 19	Nov 7
2000	May 7	Sep 23	Apr 24	Sep 23
1999	May 10	Sep 28	Apr 6	Nov 2
1998	Apr 26	Oct 19	Apr 8	Oct 29
1997	May 2	Oct 19	Apr 12	Nov 10
1996	May 9	Oct 16	May 9	Oct 31
1995	May 12	Oct 18	Apr 16	Oct 30
1994	May 3	Oct 3	Mar 25	Nov 2
1993	Apr 19	Sep 21	Apr 4	Nov 13
1992	May 12	Oct 5	Mar 28	Oct 15
1991	Apr 16	Oct 17	Apr 12	Oct 27
1990	May 8	Oct 7	Mar 27	Nov 1
1989	Apr 24	Sep 19	Mar 23	Oct 3
1988	Apr 26	Oct 27	Apr 9	Oct 27
1987	Apr 25	Oct 10	Apr 24	Oct 21
1986	Apr 30	Oct 11	Apr 24	Nov 8
1985	May 12	Sep 29	May 12	Oct 8
1984	Apr 26	Sep 24	Apr 26	Oct 31
1983	Apr 25	Sep 19	Apr 13	Nov 29
1982	May 5	Oct 5	Apr 20	Oct 19
1981	May 8	Oct 12	Apr 14	Oct 21
1980	May 7	Oct 18	Apr 23	Oct 23
1979	Apr 10	Oct 29	Mar 10	Nov 8
1978	May 7	Oct 21	May 5	Oct 30
1977	May 12	Oct 3	Apr 19	Nov 4
1976	Jun 13	Oct 13	Apr 26	Oct 17
1975	May 25	Oct 22	Apr 14	Oct 23
1974	Apr 14	Oct 6	Mar 20	Nov 26
1973	May 26	Sep 1	Apr 28	Nov 1
1972	May 25	Sep 25	Apr 30	Sep 26
1971	Apr 24	Sep 21	Apr 24	Oct 16
1970	May 18	Sep 13	Apr 28	Sep 13
1969	May 15	Sep 15	Mar 24	Oct 13
1968	May 7	Oct 8	Apr 22	Nov 14
1967	May 25	Nov 2	Apr 15	Nov 2
1966	Jun 1	Oct 9	May 28	Nov 8
1965	May 8	Sep 17	May 6	Nov 22
1964	May 26	Oct 18	May 15	Nov 13
1963	May 13	Oct 18	Apr 2	Nov 29
1962	May 19	Nov 7	Mar 30	Nov 23
1961	May 11	Sep 22	Apr 19	Oct 20
1960	May 22	Oct 9	Apr 10	Nov 5
1959	May 6	Oct 29	Apr 3	Nov 4
1958	May 13	Oct 23	Apr 4	Nov 16
1957	Apr 20	Oct 4	Mar 1	Oct 21
1956	Apr 30	Oct 27	Apr 6	Oct 28
1955	May 6	Sep 21	Apr 5	Nov 11
1954	May 6	Sep 30	May 1	Nov 28
1953	May 31	Oct 21	Apr 10	Oct 23
1952	May 5	Oct 14	Apr 29	Nov 7
1951	May 1	Oct 26	Apr 21	Oct 30

"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.