Frost history / Corvallis 10 Ssw, OR
Corvallis 10 Ssw, OR: frost dates by year
Last spring and first fall frost at NOAA station USW00004236, 2007 to 2023, measured from daily minimum temperatures.
Elevation 312 ft, 44.419, -123.326. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 14 | Oct 28 |
| Earliest | Mar 8 (2016) | Oct 9 (2019) |
| Latest | May 12 (2011) | Dec 4 (2016) |
| Trend | 11.9 days earlier per decade | 3.9 days earlier per decade |
| Years with data | 17 | 17 |
At 28°F (hard freeze) the median last spring date is Mar 4 and the median first fall date is Nov 21.
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 |
|---|---|---|---|---|
| 2023 | Apr 13 | Oct 28 | Mar 1 | Oct 29 |
| 2022 | Apr 17 | Nov 7 | Apr 15 | Nov 10 |
| 2021 | Apr 9 | Oct 12 | Apr 5 | Nov 21 |
| 2020 | Apr 13 | Oct 22 | Apr 3 | Oct 26 |
| 2019 | Mar 26 | Oct 9 | Mar 11 | Oct 10 |
| 2018 | Apr 3 | Oct 15 | Mar 6 | Nov 9 |
| 2017 | Apr 15 | Oct 14 | Feb 27 | Dec 6 |
| 2016 | Mar 8 | Dec 4 | Jan 3 | Dec 15 |
| 2015 | Apr 15 | Nov 12 | Mar 4 | Nov 21 |
| 2014 | Mar 23 | Nov 14 | Feb 8 | Nov 14 |
| 2013 | Apr 30 | Oct 29 | Jan 22 | Nov 21 |
| 2012 | Apr 6 | Nov 26 | Mar 23 | none |
| 2011 | May 12 | Oct 26 | Feb 26 | Dec 3 |
| 2010 | Apr 14 | Nov 21 | Feb 22 | Nov 23 |
| 2009 | Apr 30 | Oct 11 | Apr 4 | Dec 2 |
| 2008 | Apr 25 | Oct 11 | Mar 31 | Dec 5 |
| 2007 | Apr 20 | Oct 28 | Feb 2 | Nov 22 |
"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.