Dayton 1 Wsw, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00452030, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,557 ft, 46.315, -118.002. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 10
Earliest	Mar 26 (1994)	Sep 8 (1962)
Latest	Jun 18 (1954)	Nov 8 (2014)
Trend	2.3 days earlier per decade	3.0 days later per decade
Years with data	66	69

At 28°F (hard freeze) the median last spring date is Apr 8 and the median first fall date is Oct 25.

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	no data	Oct 15	no data	Nov 29
2024	Apr 22	Oct 18	Mar 14	Nov 6
2023	Apr 20	Oct 28	Apr 5	Oct 28
2022	May 11	Oct 22	Apr 15	Nov 9
2021	Apr 21	Oct 9	Apr 12	Oct 12
2020	Apr 17	Oct 22	Apr 13	Oct 22
2019	Apr 30	Sep 30	Mar 19	Oct 10
2018	Apr 24	Oct 3	Apr 22	Oct 14
2017	Apr 11	Oct 14	Apr 4	Oct 14
2016	Mar 30	Oct 12	Mar 18	Nov 18
2014	no data	Nov 8	no data	Nov 11
2013	May 23	Oct 14	May 1	Oct 29
2012	May 6	Oct 3	Apr 7	Oct 3
2011	May 4	Oct 25	Apr 20	Oct 25
2010	May 22	Oct 16	Apr 10	Nov 11
2009	Apr 25	Oct 6	Apr 25	Oct 10
2004	Apr 2	Oct 25	Feb 22	Nov 1
2003	Apr 25	Oct 31	Apr 4	Oct 31
2002	May 8	Oct 12	Apr 24	Oct 12
2001	Apr 14	Oct 18	Apr 14	Nov 7
2000	Apr 8	Sep 23	Mar 20	Nov 10
1999	May 10	Oct 2	Apr 14	Oct 16
1998	Apr 13	Oct 16	Mar 30	Oct 30
1997	May 2	Oct 8	Apr 11	Oct 24
1996	Apr 3	Oct 17	Mar 26	Nov 21
1995	May 26	Oct 22	Apr 16	Oct 29
1994	Mar 26	Oct 24	Mar 25	Nov 3
1993	Apr 5	Oct 26	Mar 12	Nov 5
1992	Apr 23	Oct 15	Mar 29	Oct 15
1991	Apr 13	Oct 4	Mar 21	Oct 4
1990	May 8	Oct 7	Mar 26	Oct 20
1989	Apr 9	Oct 3	Mar 5	Oct 15
1988	Apr 25	Oct 27	Mar 17	Oct 27
1987	Apr 20	Oct 10	Mar 30	Oct 20
1986	Apr 30	Oct 22	Apr 30	Nov 10
1985	May 12	Sep 28	May 12	Sep 29
1984	Jun 1	Sep 24	Apr 24	Oct 15
1983	Apr 25	Sep 19	Apr 13	Nov 26
1982	May 5	Oct 10	Apr 20	Oct 19
1981	May 5	Sep 24	Apr 13	Sep 24
1980	Apr 11	Oct 10	Apr 1	Oct 23
1979	Apr 20	Nov 1	Apr 1	Nov 10
1978	May 23	Oct 13	Apr 12	Oct 25
1977	Apr 20	Oct 10	Apr 20	Nov 3
1976	Apr 23	Oct 17	Apr 2	Oct 17
1975	Apr 29	Oct 24	Apr 6	Nov 13
1974	May 16	no data	Mar 23	no data
1973	no data	Oct 9	no data	Nov 2
1972	no data	Sep 25	no data	Oct 5
1971	Apr 19	Sep 30	Apr 12	Oct 16
1970	Apr 27	Sep 13	Apr 27	Oct 28
1969	May 3	Oct 13	Apr 26	Oct 13
1968	May 2	Oct 3	Apr 21	Nov 1
1967	May 1	Oct 20	Apr 28	Nov 2
1966	Apr 19	Oct 9	Apr 19	Nov 8
1965	May 7	Sep 17	Mar 25	Sep 17
1964	May 23	Oct 4	Apr 18	Oct 18
1963	Apr 22	Oct 19	Mar 17	Oct 26
1962	May 4	Sep 8	Mar 28	Nov 15
1961	Apr 7	Oct 7	Apr 7	Oct 21
1960	May 22	Sep 21	Mar 12	Oct 29
1959	Apr 19	Oct 1	Apr 7	Nov 5
1958	Mar 27	Sep 24	Mar 14	Oct 25
1957	Apr 18	Sep 19	Mar 27	Oct 20
1956	Apr 30	Oct 22	Apr 6	Nov 4
1955	May 14	Sep 22	May 14	Nov 2
1954	Jun 18	Sep 29	May 2	Sep 29
1953	May 11	Sep 24	Apr 11	Oct 22
1952	Jun 13	Sep 13	Apr 29	Oct 14
1951	Jun 1	Sep 27	May 31	Oct 25

"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.