Kennewick, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00454154, 1951 to 2025, measured from daily minimum temperatures.

Elevation 390 ft, 46.211, -119.101. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 6	Oct 26
Earliest	Feb 26 (2017)	Sep 17 (1965)
Latest	May 14 (1955)	Nov 30 (2025)
Trend	4.6 days earlier per decade	3.1 days later per decade
Years with data	66	69

At 28°F (hard freeze) the median last spring date is Mar 16 and the median first fall date is Nov 7.

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	Mar 7	Nov 30	Feb 16	Dec 1
2024	Mar 16	Nov 6	Mar 9	Dec 9
2023	Mar 18	Oct 28	Mar 9	Oct 28
2022	Mar 11	Nov 4	Mar 10	Nov 10
2021	Apr 13	Nov 17	Feb 21	Nov 17
2020	Apr 14	Oct 24	Mar 17	Oct 25
2019	Mar 20	Oct 10	Mar 17	Oct 29
2018	Mar 24	Nov 8	Mar 10	Nov 8
2017	Feb 26	Oct 31	Feb 26	Nov 7
2016	Mar 19	Nov 18	Feb 9	Dec 7
2015	no data	Nov 4	no data	Nov 21
2014	Mar 23	Nov 11	Mar 22	Nov 12
2013	Apr 18	Oct 30	Mar 25	Nov 21
2012	Apr 8	Nov 10	Mar 9	Nov 26
2011	Apr 21	Oct 26	Mar 6	Nov 7
2010	Apr 10	Nov 11	Feb 24	Nov 22
2009	Mar 14	Oct 11	Mar 14	Oct 11
2008	Apr 4	Oct 12	Apr 2	Nov 23
2007	Apr 4	Oct 27	Mar 2	Oct 27
2006	Mar 21	Oct 31	Feb 26	Oct 31
2005	Mar 14	Nov 8	Feb 27	Nov 9
2004	Mar 3	Nov 4	Feb 23	Nov 20
2003	Apr 4	no data	Feb 27	no data
2002	Mar 23	Oct 24	Mar 22	Oct 25
2000	Mar 20	Nov 11	Feb 26	Nov 11
1999	Apr 2	Oct 17	Feb 12	none
1998	no data	Oct 30	no data	Dec 4
1997	Apr 13	Oct 23	Apr 7	Dec 4
1996	Mar 26	Oct 17	Mar 26	Nov 21
1995	Mar 29	Oct 29	Mar 26	Oct 30
1994	Mar 26	Nov 3	Mar 25	Nov 5
1993	Mar 12	Nov 5	Mar 12	Nov 5
1992	Apr 8	Oct 16	Feb 17	Nov 24
1991	Mar 27	Oct 28	Mar 16	Oct 30
1990	Mar 27	Nov 2	Mar 12	Dec 7
1989	Mar 30	Oct 29	Mar 5	Dec 11
1988	Mar 28	Oct 27	Mar 17	Dec 1
1987	Mar 30	Oct 16	Mar 30	Nov 17
1986	May 7	Nov 10	Feb 21	Nov 10
1985	Apr 23	Sep 29	Apr 23	Oct 9
1984	no data	Oct 14	no data	Oct 17
1981	Apr 13	Oct 14	Mar 12	Oct 22
1980	Apr 11	Oct 21	Mar 25	Nov 12
1978	Mar 16	no data	Mar 15	no data
1977	Apr 19	Nov 3	Mar 16	Nov 8
1976	no data	Oct 19	no data	Oct 19
1975	Apr 29	Oct 24	Apr 6	Nov 13
1974	Apr 13	Oct 5	Mar 20	Oct 6
1973	Apr 8	Oct 3	Apr 8	Nov 5
1972	May 1	Sep 26	Apr 19	Oct 30
1971	Apr 16	Oct 17	Apr 12	Oct 17
1970	Apr 27	Sep 25	Apr 27	Oct 16
1969	Mar 29	Oct 13	Mar 25	Oct 14
1968	Apr 22	Nov 1	Apr 13	Nov 1
1967	Apr 28	Oct 20	Mar 14	Nov 4
1966	Apr 19	Oct 9	Apr 19	Nov 11
1965	Apr 7	Sep 17	Mar 24	Nov 29
1964	Apr 23	Oct 18	Apr 23	Nov 16
1963	Apr 3	Oct 19	Mar 9	Nov 21
1962	Apr 11	Nov 17	Mar 15	Nov 18
1961	Apr 7	Oct 18	Mar 5	Oct 21
1960	Apr 22	Oct 30	Mar 19	Nov 4
1959	May 6	Oct 30	Apr 9	Oct 30
1958	Mar 27	Oct 21	Mar 12	Oct 24
1957	Mar 27	Sep 19	Feb 23	Nov 3
1956	no data	Oct 22	no data	Nov 2
1955	May 14	Oct 23	Apr 25	Nov 12
1954	May 2	Oct 1	Mar 30	Oct 1
1953	Apr 15	Nov 2	Apr 2	Nov 2
1952	Apr 29	Oct 15	Apr 8	Nov 2
1951	Apr 24	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.