Frost history / Cougar 6 E, WA
Cougar 6 E, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00451760, 1959 to 2025, measured from daily minimum temperatures.
Elevation 659 ft, 46.063, -122.204. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 11 | Nov 20 |
| Earliest | Jan 31 (2016) | Oct 9 (1985) |
| Latest | May 13 (1964) | Dec 23 (1974) |
| Trend | 3.4 days earlier per decade | little change (less than half a day per decade) |
| Years with data | 55 | 58 |
At 28°F (hard freeze) the median last spring date is Feb 24 and the median first fall date is Dec 6.
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 | Apr 13 | no data | Feb 14 | no data |
| 2023 | Apr 13 | Oct 28 | Feb 25 | none |
| 2022 | Apr 13 | Nov 9 | Feb 25 | Dec 17 |
| 2021 | Apr 11 | Dec 10 | Apr 5 | Dec 27 |
| 2020 | Apr 1 | Oct 27 | none | none |
| 2019 | Mar 12 | Oct 10 | Mar 10 | Nov 30 |
| 2018 | Apr 2 | Dec 6 | Feb 23 | none |
| 2017 | Apr 3 | Nov 5 | Jan 24 | Dec 21 |
| 2016 | Jan 31 | Dec 5 | Jan 4 | Dec 7 |
| 2015 | Feb 28 | Nov 3 | none | Nov 11 |
| 2014 | no data | Nov 13 | no data | Nov 15 |
| 2013 | no data | Nov 20 | no data | Nov 20 |
| 2011 | Apr 17 | Nov 18 | Feb 27 | Dec 6 |
| 2010 | Apr 9 | Nov 22 | none | Nov 23 |
| 2009 | Apr 16 | Nov 14 | Mar 12 | Dec 5 |
| 2008 | May 9 | Dec 13 | Jan 24 | Dec 14 |
| 2007 | Apr 3 | no data | Jan 16 | no data |
| 2006 | no data | Nov 27 | no data | Nov 29 |
| 2005 | Apr 10 | Nov 28 | Feb 15 | Dec 16 |
| 2004 | Apr 1 | Nov 28 | Jan 6 | none |
| 2002 | Mar 19 | Oct 30 | Mar 18 | none |
| 2001 | Apr 4 | Dec 1 | Mar 15 | none |
| 2000 | Apr 5 | Nov 11 | none | Nov 12 |
| 1999 | Apr 13 | Dec 14 | none | Dec 29 |
| 1998 | Mar 29 | Dec 6 | Jan 13 | Dec 19 |
| 1997 | Apr 12 | Dec 8 | Feb 28 | none |
| 1996 | May 8 | Nov 23 | Mar 24 | none |
| 1994 | Mar 23 | Oct 11 | Feb 9 | Nov 18 |
| 1993 | Feb 26 | no data | Feb 26 | no data |
| 1992 | no data | Nov 10 | no data | Dec 5 |
| 1991 | Apr 11 | no data | Apr 11 | no data |
| 1990 | Mar 14 | Nov 2 | Feb 19 | Dec 19 |
| 1989 | Apr 3 | Nov 25 | Mar 3 | Dec 17 |
| 1988 | Mar 29 | Nov 24 | Feb 3 | Dec 26 |
| 1987 | Mar 28 | Dec 13 | Feb 25 | Dec 13 |
| 1986 | Apr 29 | Nov 10 | Feb 20 | none |
| 1985 | May 12 | Oct 9 | Mar 6 | Oct 9 |
| 1984 | Apr 26 | Oct 17 | Jan 20 | Dec 5 |
| 1983 | no data | Nov 29 | no data | Dec 19 |
| 1981 | Apr 11 | Nov 29 | Feb 12 | Dec 30 |
| 1980 | no data | Dec 1 | no data | Dec 6 |
| 1979 | Mar 8 | Nov 26 | Feb 15 | Dec 11 |
| 1978 | Apr 23 | Nov 5 | Jan 4 | Nov 10 |
| 1977 | Apr 19 | Nov 8 | Apr 19 | Nov 19 |
| 1976 | Apr 16 | Nov 26 | Mar 6 | Nov 26 |
| 1975 | Apr 30 | Nov 17 | Mar 27 | Nov 28 |
| 1974 | Apr 8 | Dec 23 | Mar 9 | none |
| 1973 | Apr 29 | Nov 2 | Feb 4 | none |
| 1972 | Apr 22 | Nov 27 | Feb 9 | Dec 4 |
| 1971 | Mar 18 | Oct 27 | Mar 17 | Oct 27 |
| 1970 | Apr 26 | Nov 22 | Jan 11 | Nov 22 |
| 1969 | Mar 31 | Nov 19 | Feb 26 | none |
| 1968 | May 8 | Nov 15 | Jan 31 | Dec 19 |
| 1967 | Apr 29 | Nov 28 | Mar 13 | Dec 12 |
| 1966 | May 11 | Nov 8 | Feb 16 | none |
| 1965 | May 7 | Dec 13 | Jan 4 | Dec 16 |
| 1964 | May 13 | Oct 26 | Feb 26 | Dec 16 |
| 1963 | Apr 16 | Nov 20 | Feb 1 | Nov 27 |
| 1962 | Mar 28 | Nov 28 | Mar 2 | Dec 24 |
| 1961 | Apr 23 | Nov 2 | Jan 4 | Nov 2 |
| 1960 | Mar 5 | Nov 21 | Mar 5 | none |
| 1959 | no data | Nov 11 | no data | Nov 13 |
"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.