Frost history / Westfall, OR
Westfall, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00359176, 1963 to 2010, measured from daily minimum temperatures.
Elevation 3,040 ft, 43.990, -117.718. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Sep 23 |
| Earliest | Apr 24 (1963) | Aug 27 (1964) |
| Latest | Jun 18 (1996) | Oct 26 (1979) |
| Trend | little change (less than half a day per decade) | little change (less than half a day per decade) |
| Years with data | 28 | 28 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 5.
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 |
|---|---|---|---|---|
| 2010 | May 7 | no data | May 7 | no data |
| 2009 | May 21 | Oct 1 | May 13 | Oct 1 |
| 2008 | May 13 | Sep 23 | May 2 | Oct 13 |
| 2007 | May 4 | Sep 25 | May 4 | Oct 11 |
| 2006 | May 10 | Sep 17 | May 3 | Oct 12 |
| 2005 | no data | Sep 10 | no data | Sep 25 |
| 2002 | May 12 | no data | May 8 | no data |
| 2000 | Jun 1 | Sep 24 | Apr 8 | Sep 24 |
| 1999 | May 16 | Sep 28 | May 11 | Sep 28 |
| 1998 | May 17 | Oct 5 | Apr 18 | Oct 5 |
| 1997 | no data | Oct 5 | no data | Oct 7 |
| 1996 | Jun 18 | Sep 5 | May 4 | Sep 22 |
| 1995 | no data | Sep 21 | no data | Sep 21 |
| 1994 | Jun 8 | Oct 3 | Apr 15 | Oct 11 |
| 1993 | May 9 | Sep 22 | Apr 20 | Oct 26 |
| 1992 | no data | Sep 7 | no data | Sep 27 |
| 1986 | May 22 | Sep 25 | Apr 29 | Nov 1 |
| 1984 | Jun 1 | Sep 23 | May 16 | Sep 25 |
| 1983 | May 12 | Sep 20 | May 12 | Sep 20 |
| 1982 | May 5 | Oct 5 | May 5 | Oct 18 |
| 1981 | no data | Sep 23 | no data | Oct 15 |
| 1980 | Jun 4 | no data | Apr 11 | no data |
| 1979 | no data | Oct 26 | no data | Oct 30 |
| 1978 | May 25 | Oct 2 | Apr 21 | Oct 22 |
| 1975 | May 25 | no data | May 25 | no data |
| 1974 | no data | Oct 5 | no data | Oct 6 |
| 1972 | May 18 | no data | Apr 30 | no data |
| 1971 | May 22 | no data | Apr 13 | no data |
| 1970 | May 14 | Sep 9 | May 11 | Sep 12 |
| 1969 | May 3 | Sep 15 | May 2 | Oct 4 |
| 1968 | May 8 | no data | May 7 | no data |
| 1967 | May 26 | no data | May 26 | no data |
| 1966 | no data | Oct 3 | no data | Oct 8 |
| 1965 | May 17 | Aug 30 | May 17 | Sep 15 |
| 1964 | May 23 | Aug 27 | May 23 | Aug 27 |
| 1963 | Apr 24 | Oct 24 | Apr 21 | Oct 26 |
"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.