Frost history / Powers, OR
Powers, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00356820, 1951 to 2007, measured from daily minimum temperatures.
Elevation 230 ft, 42.889, -124.069. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 14 | Oct 31 |
| Earliest | Feb 11 (2004) | Sep 13 (1970) |
| Latest | May 20 (1959) | Dec 15 (1996) |
| Trend | 5.0 days earlier per decade | 0.6 days later per decade |
| Years with data | 53 | 48 |
At 28°F (hard freeze) the median last spring date is Feb 21 and the median first fall date is Nov 20.
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 |
|---|---|---|---|---|
| 2007 | Apr 2 | Nov 21 | Feb 2 | Nov 23 |
| 2006 | Mar 13 | Oct 10 | Feb 20 | Oct 31 |
| 2005 | Apr 14 | Nov 18 | Feb 15 | Dec 13 |
| 2004 | Feb 11 | Nov 4 | none | Nov 21 |
| 2001 | Apr 6 | no data | Feb 15 | no data |
| 2000 | Mar 27 | Oct 24 | Jan 30 | Nov 12 |
| 1999 | Mar 12 | Oct 16 | Mar 11 | Oct 17 |
| 1998 | Apr 14 | no data | none | no data |
| 1997 | Apr 5 | no data | Jan 16 | no data |
| 1996 | May 2 | Dec 15 | Feb 27 | Dec 19 |
| 1995 | Apr 20 | Nov 1 | none | Nov 3 |
| 1994 | Apr 6 | Oct 11 | Feb 6 | Nov 22 |
| 1993 | Feb 28 | Nov 2 | Feb 28 | Nov 7 |
| 1992 | no data | Oct 15 | no data | Dec 4 |
| 1991 | Apr 8 | Oct 30 | Jan 31 | Nov 30 |
| 1990 | Mar 13 | Oct 8 | Feb 20 | Dec 20 |
| 1989 | Apr 28 | Oct 29 | Feb 15 | Dec 11 |
| 1988 | Apr 9 | no data | Feb 17 | no data |
| 1987 | Mar 22 | no data | Feb 26 | no data |
| 1986 | Apr 24 | Nov 25 | Feb 9 | Dec 10 |
| 1985 | May 12 | Oct 8 | Mar 8 | Oct 9 |
| 1984 | Apr 28 | Sep 26 | Feb 3 | Dec 19 |
| 1983 | Apr 14 | Nov 8 | Jan 14 | Dec 22 |
| 1982 | Apr 15 | Nov 2 | Feb 11 | Nov 11 |
| 1981 | Apr 10 | Nov 25 | Mar 6 | none |
| 1980 | Apr 7 | Nov 12 | Jan 31 | Nov 13 |
| 1979 | Apr 19 | Nov 13 | Feb 3 | Nov 20 |
| 1978 | Mar 15 | Oct 31 | Feb 11 | Nov 10 |
| 1977 | Apr 19 | Nov 4 | Feb 4 | Nov 20 |
| 1976 | Apr 26 | Oct 23 | Apr 2 | Nov 27 |
| 1975 | Apr 28 | Nov 8 | Mar 28 | Nov 18 |
| 1974 | Apr 14 | Oct 5 | Mar 9 | Dec 24 |
| 1973 | Apr 7 | Nov 3 | Mar 22 | none |
| 1972 | Apr 30 | Oct 30 | Feb 4 | Dec 5 |
| 1971 | Apr 1 | Oct 17 | Mar 18 | Oct 29 |
| 1970 | Apr 27 | Sep 13 | Feb 21 | Oct 27 |
| 1969 | Apr 25 | Oct 13 | Mar 14 | Nov 27 |
| 1968 | Apr 22 | Nov 30 | Apr 13 | Dec 20 |
| 1967 | Apr 28 | Nov 22 | Feb 20 | Dec 12 |
| 1966 | Apr 20 | Oct 14 | Mar 17 | none |
| 1965 | May 1 | Sep 18 | Mar 25 | Dec 15 |
| 1964 | Apr 19 | Nov 14 | Feb 27 | Nov 15 |
| 1962 | Mar 13 | no data | Mar 13 | no data |
| 1961 | Apr 22 | Nov 13 | Jan 20 | Nov 15 |
| 1960 | Mar 10 | Nov 4 | Mar 1 | Nov 27 |
| 1959 | May 20 | Oct 31 | Feb 12 | Nov 6 |
| 1958 | May 13 | Oct 24 | none | Nov 16 |
| 1957 | Mar 23 | Nov 2 | Feb 6 | Nov 3 |
| 1956 | Apr 6 | Nov 20 | Mar 12 | Nov 20 |
| 1955 | May 9 | Nov 13 | Mar 20 | Nov 14 |
| 1954 | May 1 | Oct 1 | May 1 | Nov 30 |
| 1953 | Apr 9 | Oct 23 | Apr 8 | none |
| 1952 | May 5 | Nov 2 | Mar 22 | Nov 17 |
| 1951 | Apr 21 | Oct 31 | Mar 23 | Nov 24 |
"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.