Winchester, OR: frost dates by year

Last spring and first fall frost at NOAA station USC00359461, 1990 to 2025, measured from daily minimum temperatures.

Elevation 460 ft, 43.283, -123.354. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 28	Nov 12
Earliest	Feb 23 (2016)	Oct 2 (2019)
Latest	May 5 (1996)	Dec 15 (2012)
Trend	1.7 days earlier per decade	2.6 days later per decade
Years with data	33	34

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

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	Feb 27	Dec 13	Feb 13	none
2024	Mar 15	Oct 24	none	none
2023	Apr 18	Nov 24	Feb 26	Nov 25
2022	Apr 15	Nov 15	Feb 27	Dec 17
2021	Apr 13	Nov 21	Mar 16	none
2020	Mar 14	Oct 23	Feb 19	Oct 26
2019	Mar 18	Oct 2	Mar 15	Oct 10
2018	Apr 4	Oct 14	Mar 26	Nov 12
2017	Apr 10	Nov 7	Jan 29	Nov 19
2016	Feb 23	Dec 7	Jan 3	Dec 7
2015	Mar 4	Nov 26	Mar 2	Nov 26
2014	Mar 24	Nov 17	Jan 7	Dec 30
2013	Mar 7	Nov 21	Jan 23	Nov 22
2012	Mar 20	Dec 15	Jan 15	none
2011	Apr 23	Oct 26	Feb 28	Dec 6
2010	Apr 10	Nov 23	Feb 23	Nov 25
2009	Apr 17	Dec 4	Feb 1	Dec 6
2008	Apr 21	Oct 11	Apr 2	Dec 16
2007	Mar 28	Oct 27	Feb 3	none
2006	Mar 14	Oct 26	Feb 21	Oct 31
2005	Mar 16	Dec 15	Feb 17	Dec 15
2004	Apr 2	Nov 22	none	none
2003	Feb 27	Oct 31	Feb 25	Nov 1
2002	no data	Oct 30	no data	Oct 30
2000	Mar 31	Nov 10	none	Nov 12
1999	Apr 2	no data	Mar 12	no data
1998	Apr 13	Dec 4	none	Dec 19
1997	Apr 5	Dec 3	Jan 16	Dec 12
1996	May 5	Nov 21	Feb 3	none
1995	Mar 28	Nov 3	Jan 5	none
1994	Mar 23	Nov 15	Feb 9	Dec 4
1993	Feb 28	Nov 6	Feb 28	Nov 14
1992	no data	Oct 16	no data	Dec 5
1991	Apr 13	Oct 30	Jan 31	Nov 30
1990	Mar 14	Oct 8	Mar 13	Dec 19

"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.