Frost history / Cascadia, OR
Cascadia, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00351433, 1951 to 2012, measured from daily minimum temperatures.
Elevation 960 ft, 44.391, -122.481. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 11 | Oct 5 |
| Earliest | Mar 24 (1989) | Aug 21 (1980) |
| Latest | Jun 26 (1976) | Nov 18 (2010) |
| Trend | 3.1 days earlier per decade | 2.8 days later per decade |
| Years with data | 49 | 47 |
At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Nov 3.
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 |
|---|---|---|---|---|
| 2012 | May 18 | no data | May 11 | no data |
| 2011 | May 5 | Oct 25 | Apr 24 | Nov 20 |
| 2010 | May 7 | Nov 18 | Apr 11 | Nov 23 |
| 2009 | no data | Oct 13 | no data | Dec 1 |
| 2006 | May 13 | no data | May 2 | no data |
| 2004 | Apr 2 | Nov 4 | Apr 2 | Nov 4 |
| 2003 | May 19 | Oct 31 | Feb 28 | Oct 31 |
| 2002 | May 12 | Oct 2 | May 8 | Oct 12 |
| 2001 | May 11 | Oct 18 | Apr 6 | Nov 7 |
| 2000 | Apr 24 | Sep 23 | Apr 7 | Nov 10 |
| 1999 | Apr 23 | Sep 27 | Apr 10 | Sep 27 |
| 1998 | Apr 17 | Oct 20 | Mar 7 | Oct 30 |
| 1997 | Apr 13 | Oct 20 | Apr 5 | Dec 2 |
| 1996 | May 10 | Oct 17 | Mar 27 | Dec 15 |
| 1995 | Apr 23 | Oct 19 | Mar 29 | Nov 1 |
| 1994 | Apr 6 | Oct 3 | Mar 26 | Nov 3 |
| 1993 | Mar 28 | Sep 21 | Mar 1 | Nov 6 |
| 1992 | May 21 | Oct 14 | Feb 6 | Oct 15 |
| 1991 | Jun 4 | Sep 21 | Jan 31 | Oct 30 |
| 1990 | May 8 | Oct 7 | Mar 13 | Oct 8 |
| 1989 | Mar 24 | Oct 4 | Mar 23 | Oct 29 |
| 1988 | Apr 23 | Sep 18 | Mar 18 | Nov 30 |
| 1987 | May 20 | Oct 13 | Mar 29 | Nov 26 |
| 1986 | May 14 | Oct 11 | May 5 | Dec 9 |
| 1985 | May 15 | Sep 29 | Mar 15 | Oct 8 |
| 1984 | Jun 1 | Sep 24 | Feb 3 | Nov 22 |
| 1983 | no data | Sep 20 | no data | Dec 21 |
| 1982 | May 11 | Sep 15 | Apr 9 | Nov 10 |
| 1981 | Apr 17 | Oct 12 | Mar 18 | Nov 5 |
| 1980 | May 16 | Aug 21 | Apr 3 | Oct 22 |
| 1979 | May 30 | Nov 1 | Feb 3 | Nov 13 |
| 1978 | May 30 | Oct 13 | Apr 12 | Nov 1 |
| 1977 | May 12 | Oct 4 | Apr 20 | Nov 19 |
| 1976 | Jun 26 | Oct 17 | Mar 12 | Oct 17 |
| 1974 | May 30 | no data | Apr 13 | no data |
| 1973 | May 21 | Oct 2 | Apr 7 | Nov 2 |
| 1972 | May 10 | Sep 26 | Apr 30 | Oct 30 |
| 1971 | Apr 19 | Sep 19 | Mar 20 | Oct 17 |
| 1970 | Apr 26 | Sep 13 | Apr 17 | Sep 13 |
| 1969 | Apr 27 | Oct 5 | Mar 24 | Oct 14 |
| 1968 | May 8 | Oct 2 | Apr 17 | Dec 20 |
| 1967 | May 25 | Nov 16 | Apr 19 | Nov 20 |
| 1966 | Jun 1 | Oct 14 | Apr 29 | Nov 24 |
| 1965 | no data | Sep 17 | no data | Sep 17 |
| 1963 | May 13 | no data | Apr 22 | no data |
| 1962 | Apr 30 | Oct 5 | Mar 29 | Nov 29 |
| 1961 | Apr 27 | Sep 22 | Jan 28 | Oct 29 |
| 1958 | May 13 | no data | Mar 16 | no data |
| 1954 | May 22 | Sep 28 | May 1 | Oct 25 |
| 1953 | May 11 | Oct 3 | Apr 9 | Dec 22 |
| 1952 | May 9 | Oct 15 | Apr 8 | Nov 2 |
| 1951 | May 30 | Oct 17 | Apr 22 | Nov 1 |
"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.