Silverton, OR: frost dates by year

Last spring and first fall frost at NOAA station USC00357823, 1963 to 2025, measured from daily minimum temperatures.

Elevation 408 ft, 45.006, -122.774. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 3	Nov 8
Earliest	Feb 17 (2005)	Oct 8 (1985)
Latest	Apr 30 (1972)	Dec 7 (2016)
Trend	4.2 days earlier per decade	1.5 days later per decade
Years with data	56	59

At 28°F (hard freeze) the median last spring date is Mar 2 and the median first fall date is Nov 24.

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 18	no data	Mar 18	no data
2024	Mar 14	Nov 27	Mar 7	Nov 27
2023	Mar 27	Oct 28	Mar 26	Nov 25
2022	no data	Nov 8	no data	Nov 13
2020	Mar 17	no data	Feb 19	no data
2019	Mar 14	Oct 10	Mar 12	Oct 30
2018	Apr 4	Nov 9	Feb 24	Dec 4
2017	Mar 6	Nov 7	Jan 17	Dec 9
2016	Feb 24	Dec 7	Jan 4	Dec 7
2015	Mar 5	Nov 21	Jan 3	Nov 26
2014	Mar 23	Nov 13	Feb 9	Nov 15
2013	Mar 18	Oct 29	Mar 4	Nov 21
2012	Apr 7	Nov 26	Mar 8	none
2011	Apr 22	Nov 2	Feb 27	Dec 4
2010	Mar 19	Nov 22	none	Nov 23
2009	Apr 5	Dec 3	Mar 13	Dec 5
2008	Apr 21	Nov 23	Jan 26	Dec 15
2007	Apr 4	Nov 1	Feb 3	Nov 22
2006	no data	Oct 30	no data	Oct 31
2005	Feb 17	Nov 8	Feb 17	Nov 9
2004	Feb 20	Nov 5	Jan 7	Dec 2
2003	Apr 25	Oct 31	Feb 25	Nov 1
2002	Mar 18	Oct 30	Mar 2	Oct 30
2001	Apr 14	Oct 28	Feb 13	none
2000	Apr 24	Nov 10	Mar 15	Nov 10
1999	Apr 2	Nov 18	Mar 6	Dec 4
1998	Mar 7	Nov 9	Mar 6	Dec 19
1997	Apr 12	Dec 2	Feb 11	Dec 6
1996	Mar 26	Nov 21	Mar 25	Nov 23
1995	Apr 16	Oct 31	Mar 26	Oct 31
1994	Mar 7	Nov 3	Feb 8	Nov 3
1993	Feb 28	Nov 5	Feb 28	Nov 7
1992	no data	Nov 10	no data	Nov 24
1991	Mar 26	no data	Jan 30	no data
1990	no data	Nov 19	no data	Dec 12
1989	Mar 23	Oct 29	Mar 5	Nov 30
1988	Apr 8	Oct 27	Mar 11	Dec 1
1987	no data	Nov 28	no data	Nov 29
1986	Apr 24	Nov 10	Feb 10	Nov 10
1985	no data	Oct 8	no data	Oct 9
1984	Mar 30	Nov 23	Jan 21	Dec 4
1983	Apr 13	Nov 29	Feb 5	Dec 17
1982	Apr 29	Oct 19	Apr 16	Nov 10
1981	Apr 13	Nov 27	Mar 6	Nov 28
1980	Apr 11	Nov 10	Feb 13	Nov 13
1979	Mar 2	Nov 11	Feb 3	Nov 14
1978	Apr 6	Oct 31	Feb 12	Nov 10
1977	Apr 18	Nov 4	Feb 7	Nov 8
1976	Apr 2	Nov 19	Mar 8	Nov 27
1975	Apr 6	Nov 12	Mar 27	Nov 18
1974	Apr 13	Nov 3	Mar 9	Dec 23
1973	Mar 23	Nov 2	Jan 27	Nov 2
1972	Apr 30	Oct 30	Mar 7	Oct 30
1971	Apr 13	Oct 18	Mar 20	Oct 28
1970	Apr 12	Oct 27	Jan 12	Nov 22
1969	Apr 30	Oct 14	Mar 11	Nov 29
1968	Apr 14	Oct 31	Mar 30	Dec 7
1967	Apr 19	Nov 22	Mar 13	Nov 27
1966	Mar 23	Oct 15	Mar 23	none
1965	Mar 25	Nov 25	Mar 20	Nov 25
1964	Apr 18	Oct 18	Feb 28	Nov 15
1963	Apr 2	Nov 20	Mar 5	Nov 29

"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.