Richland, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00457015, 1951 to 2025, measured from daily minimum temperatures.

Elevation 373 ft, 46.312, -119.263. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 8	Oct 21
Earliest	Mar 15 (1978)	Sep 17 (1965)
Latest	May 1 (1986)	Nov 17 (2016)
Trend	0.8 days earlier per decade	1.2 days later per decade
Years with data	70	69

At 28°F (hard freeze) the median last spring date is Mar 19 and the median first fall date is Nov 4.

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 30	Oct 30	Feb 21	Dec 1
2024	Apr 18	Oct 30	Mar 9	Nov 7
2023	Apr 13	Oct 27	Mar 17	Oct 28
2022	Apr 15	Nov 3	Mar 10	Nov 9
2021	Apr 12	Nov 1	Apr 12	Nov 17
2020	Apr 13	Oct 22	Apr 2	Oct 25
2019	Mar 20	Oct 10	Mar 19	Oct 10
2018	Mar 23	Nov 7	Mar 10	Nov 8
2017	Apr 11	Oct 31	Feb 28	Nov 4
2016	Mar 29	Nov 17	Mar 18	Nov 18
2014	no data	Nov 11	no data	Nov 11
2013	Apr 17	Oct 29	Apr 17	Oct 30
2012	Apr 7	Oct 6	Apr 7	Nov 10
2011	Apr 23	Oct 26	Apr 7	Nov 2
2010	Apr 4	Oct 17	Mar 20	Nov 21
2009	Apr 5	Oct 11	Mar 13	Oct 11
2008	no data	Oct 12	no data	Oct 22
2007	Apr 20	Oct 26	Apr 3	Oct 27
2006	Mar 27	Oct 30	Mar 19	Oct 30
2005	Mar 25	Nov 8	Feb 27	Nov 8
2004	Apr 2	Oct 25	Mar 2	Nov 4
2003	Apr 4	Oct 30	Feb 26	Oct 31
2002	Apr 3	Oct 12	Apr 3	Oct 24
2001	Apr 14	no data	Mar 22	no data
2000	Apr 8	Sep 23	Mar 7	Nov 10
1999	Apr 15	Oct 16	Mar 11	Nov 5
1998	Apr 13	no data	Mar 28	no data
1997	Apr 12	Oct 21	Apr 12	Nov 15
1996	Apr 3	Oct 17	Mar 25	Oct 17
1993	Mar 31	Oct 20	Mar 17	Nov 5
1992	Apr 9	Oct 7	Apr 8	Nov 24
1991	Apr 6	Oct 28	Mar 16	Oct 28
1990	Mar 27	Nov 2	Mar 25	Nov 6
1989	Mar 29	Oct 16	Mar 4	Oct 29
1988	Apr 9	Oct 26	Apr 9	Nov 29
1987	Mar 30	Oct 13	Mar 30	Nov 17
1986	May 1	Oct 13	Feb 20	Nov 10
1985	Mar 26	Sep 29	Mar 16	Oct 8
1984	Mar 30	Sep 29	Feb 26	Oct 17
1983	Apr 15	Sep 29	Feb 6	Nov 26
1982	Apr 21	Oct 18	Mar 16	Oct 19
1981	Apr 14	Oct 19	Mar 6	Oct 21
1980	Apr 1	no data	Mar 25	no data
1979	Mar 21	Nov 1	Mar 10	Nov 11
1978	Mar 15	Oct 22	Mar 6	Oct 22
1977	Mar 29	Oct 27	Feb 25	Nov 3
1976	Apr 3	Oct 19	Mar 15	Oct 29
1975	Apr 11	Nov 10	Apr 5	Nov 12
1974	Mar 20	Oct 6	Mar 20	Nov 26
1973	Apr 8	Oct 8	Apr 8	Nov 5
1972	May 1	Sep 25	Apr 22	Oct 30
1971	Apr 19	Oct 25	Apr 12	Oct 29
1970	Apr 28	Oct 7	Apr 27	Oct 15
1969	Apr 8	Oct 13	Mar 25	Oct 14
1968	Apr 22	Oct 14	Apr 13	Nov 5
1967	Apr 28	Oct 20	Mar 14	Nov 4
1966	Apr 19	Nov 3	Mar 22	Nov 11
1965	Mar 28	Sep 17	Mar 25	Nov 29
1964	Apr 23	Oct 18	Apr 17	Oct 26
1963	Apr 3	Oct 19	Mar 15	Nov 21
1962	Mar 29	Nov 7	Mar 15	Nov 18
1961	Apr 5	Oct 18	Mar 5	Oct 21
1960	Apr 22	Oct 30	Mar 12	Nov 4
1959	Apr 9	Oct 30	Mar 20	Nov 5
1958	Apr 6	Oct 21	Mar 11	Oct 24
1957	Mar 27	Nov 2	Feb 23	Nov 4
1956	Apr 6	Oct 22	Mar 14	Nov 14
1955	Apr 25	Oct 23	Apr 5	Nov 3
1954	May 1	Oct 1	Mar 30	Oct 14
1953	Apr 2	Oct 12	Apr 2	Nov 3
1952	Apr 9	Nov 2	Apr 8	Nov 2
1951	Apr 21	Oct 26	Apr 21	Oct 31

"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.