Frost history / Beaverton 2 Ssw, OR
Beaverton 2 Ssw, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00350595, 1973 to 2006, measured from daily minimum temperatures.
Elevation 270 ft, 45.455, -122.820. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 14 | Nov 2 |
| Earliest | Mar 1 (1993) | Oct 5 (1974) |
| Latest | May 25 (1975) | Dec 28 (1999) |
| Trend | 7.5 days earlier per decade | 9.2 days later per decade |
| Years with data | 27 | 28 |
At 28°F (hard freeze) the median last spring date is Mar 3 and the median first fall date is Nov 26.
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 |
|---|---|---|---|---|
| 2006 | no data | Oct 31 | no data | Nov 28 |
| 2002 | May 8 | Oct 25 | Mar 8 | Nov 2 |
| 2001 | Apr 14 | Nov 7 | Feb 13 | none |
| 2000 | Apr 24 | Nov 11 | Feb 20 | Nov 12 |
| 1999 | Apr 9 | Dec 28 | Jan 7 | Dec 29 |
| 1998 | Mar 29 | Dec 5 | Jan 13 | Dec 19 |
| 1997 | Apr 9 | no data | Jan 28 | no data |
| 1996 | Mar 28 | Nov 19 | Mar 27 | Dec 18 |
| 1995 | Apr 19 | Oct 31 | Mar 8 | Oct 31 |
| 1994 | Mar 7 | Nov 3 | Feb 9 | Nov 18 |
| 1993 | Mar 1 | Nov 6 | Feb 28 | Nov 8 |
| 1992 | no data | Nov 23 | no data | Dec 18 |
| 1991 | no data | Oct 28 | no data | Nov 30 |
| 1990 | Mar 14 | no data | Mar 13 | no data |
| 1989 | Mar 23 | Oct 30 | Mar 3 | Dec 12 |
| 1988 | Apr 12 | Nov 27 | Mar 12 | Nov 30 |
| 1987 | Apr 19 | Nov 29 | Feb 26 | Nov 29 |
| 1986 | Apr 24 | Nov 30 | Feb 10 | Dec 11 |
| 1985 | no data | Oct 9 | no data | Nov 11 |
| 1984 | Apr 26 | Oct 16 | Feb 2 | Nov 22 |
| 1983 | Apr 14 | Oct 16 | Feb 5 | Nov 30 |
| 1982 | May 4 | Oct 20 | Apr 19 | Nov 2 |
| 1981 | Apr 13 | Oct 12 | Apr 13 | Nov 5 |
| 1980 | Apr 3 | Oct 22 | Mar 24 | Dec 7 |
| 1979 | Apr 10 | Nov 8 | Feb 14 | Nov 12 |
| 1978 | May 5 | Oct 26 | Mar 15 | Nov 12 |
| 1977 | Apr 19 | Nov 3 | Apr 19 | Nov 8 |
| 1976 | Apr 26 | Oct 17 | Mar 12 | Nov 26 |
| 1975 | May 25 | Nov 12 | Apr 8 | Nov 12 |
| 1974 | Apr 13 | Oct 5 | Mar 9 | Dec 23 |
| 1973 | Apr 29 | no data | Feb 20 | no data |
"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.