Frost history / Saint Helens Rfd, OR
Saint Helens Rfd, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00357466, 1976 to 2011, measured from daily minimum temperatures.
Elevation 269 ft, 45.849, -122.872. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 18 | Nov 7 |
| Earliest | Mar 13 (1990) | Oct 19 (1982) |
| Latest | Jun 3 (2003) | Nov 29 (1983) |
| Trend | 8.0 days later per decade | 0.5 days later per decade |
| Years with data | 18 | 13 |
At 28°F (hard freeze) the median last spring date is Mar 13 and the median first fall date is Nov 23.
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 |
|---|---|---|---|---|
| 2011 | Apr 21 | no data | Mar 6 | no data |
| 2010 | no data | Nov 11 | no data | Nov 22 |
| 2003 | Jun 3 | no data | Jun 3 | no data |
| 2000 | May 10 | no data | Apr 28 | no data |
| 1999 | May 18 | no data | May 9 | no data |
| 1998 | Apr 8 | no data | Mar 18 | no data |
| 1997 | Apr 16 | no data | Apr 16 | no data |
| 1996 | Apr 17 | Oct 19 | Mar 30 | Nov 23 |
| 1995 | Mar 29 | no data | Mar 4 | no data |
| 1994 | no data | Nov 4 | no data | Nov 18 |
| 1993 | no data | Nov 7 | no data | Nov 14 |
| 1991 | May 9 | no data | Mar 31 | no data |
| 1990 | Mar 13 | no data | Mar 13 | no data |
| 1987 | Mar 22 | Nov 17 | Jan 21 | Nov 29 |
| 1985 | Apr 25 | no data | Feb 13 | no data |
| 1984 | Apr 26 | Oct 31 | Jan 20 | Dec 6 |
| 1983 | Apr 14 | Nov 29 | Feb 4 | Dec 1 |
| 1982 | Apr 19 | Oct 19 | Mar 14 | Nov 25 |
| 1981 | no data | Nov 28 | no data | Nov 28 |
| 1980 | Apr 3 | Nov 12 | Feb 15 | Nov 13 |
| 1979 | Apr 8 | no data | Apr 8 | no data |
| 1978 | no data | Oct 25 | no data | Nov 10 |
| 1977 | Apr 19 | Nov 8 | Jan 30 | Nov 19 |
| 1976 | no data | Oct 20 | no data | Nov 27 |
"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.