Cougar Dam, OR: frost dates by year

Last spring and first fall frost at NOAA station USC00351914, 2007 to 2025, measured from daily minimum temperatures.

Elevation 1,260 ft, 44.131, -122.242. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 24	Nov 21
Earliest	Jan 16 (2020)	Oct 24 (2024)
Latest	May 11 (2012)	Dec 13 (2012)
Trend	23.4 days earlier per decade	4.9 days earlier per decade
Years with data	17	17, 2 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 26 and the median first fall date is Nov 30.

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 17	Nov 21	Feb 13	none
2024	Mar 9	Oct 24	Mar 7	Nov 29
2023	Apr 16	Nov 9	Feb 26	Nov 28
2022	Apr 18	Nov 9	Mar 12	Nov 20
2020	Jan 16	none	none	none
2019	Mar 12	Nov 29	Mar 5	Dec 1
2017	Mar 8	none	Jan 25	none
2016	Feb 3	Dec 6	Jan 4	Dec 7
2015	Apr 4	Nov 22	Feb 25	Nov 25
2014	Mar 24	Nov 15	Feb 7	Nov 16
2013	Mar 24	Oct 30	Jan 23	Nov 26
2012	May 11	Dec 13	Mar 8	Dec 31
2011	May 1	Oct 25	Feb 27	Dec 4
2010	Mar 24	Nov 21	none	Nov 23
2009	Apr 25	Nov 12	Mar 12	Dec 4
2008	Apr 21	Nov 25	Apr 3	Dec 15
2007	Apr 21	Nov 21	Feb 3	Dec 9

"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.