Frost history / Nature Park-Beaverton, OR
Nature Park-Beaverton, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00355945, 2007 to 2025, measured from daily minimum temperatures.
Elevation 185 ft, 45.498, -122.839. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 14 | Nov 27 |
| Earliest | Jan 2 (2015) | Nov 17 (2014) |
| Latest | Mar 12 (2019) | Dec 14 (2008) |
| Trend | 5.7 days later per decade | 1.6 days earlier per decade |
| Years with data | 15, 2 with no freeze | 18, 4 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 9 and the median first fall date is Dec 4.
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 |
|---|---|---|---|---|
| 2025 | no data | none | no data | none |
| 2024 | Jan 17 | Dec 4 | Jan 17 | none |
| 2023 | Feb 26 | Nov 26 | Feb 26 | none |
| 2022 | Feb 26 | Nov 21 | none | Dec 23 |
| 2021 | Feb 14 | none | Feb 9 | none |
| 2019 | Mar 12 | Nov 28 | Feb 10 | Nov 29 |
| 2018 | Feb 24 | none | none | none |
| 2017 | Jan 17 | Dec 9 | Jan 16 | none |
| 2016 | none | Dec 7 | none | none |
| 2015 | Jan 2 | Nov 25 | none | none |
| 2014 | Feb 8 | Nov 17 | Feb 7 | none |
| 2013 | Jan 22 | Nov 21 | none | Dec 4 |
| 2012 | Mar 7 | none | none | none |
| 2011 | Feb 26 | Dec 4 | Feb 26 | none |
| 2010 | none | Nov 23 | none | Nov 23 |
| 2009 | no data | Dec 2 | no data | Dec 4 |
| 2008 | Jan 26 | Dec 14 | none | Dec 15 |
| 2007 | no data | Nov 25 | no data | none |
"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.