Frost history / Keno, OR
Keno, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00354403, 2011 to 2024, measured from daily minimum temperatures.
Elevation 4,128 ft, 42.094, -121.902. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 18 | Sep 23 |
| Earliest | Jun 4 (2011) | Sep 5 (2015) |
| Latest | Jul 2 (2020) | Oct 13 (2024) |
| Trend | 9.5 days later per decade | 2.8 days later per decade |
| Years with data | 11 | 12 |
At 28°F (hard freeze) the median last spring date is May 29 and the median first fall date is Oct 3.
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 |
|---|---|---|---|---|
| 2024 | Jun 18 | Oct 13 | May 23 | Oct 18 |
| 2023 | Jun 20 | Sep 22 | May 10 | Sep 28 |
| 2020 | Jul 2 | Oct 9 | Jun 17 | Oct 22 |
| 2019 | Jun 21 | Sep 11 | Jun 8 | Oct 1 |
| 2018 | Jun 16 | Sep 12 | Jun 10 | Oct 5 |
| 2017 | Jun 14 | Sep 21 | May 18 | Sep 22 |
| 2016 | Jun 11 | Sep 23 | Jun 11 | Sep 23 |
| 2015 | no data | Sep 5 | no data | Sep 5 |
| 2014 | Jun 18 | Oct 1 | May 29 | Nov 2 |
| 2013 | Jun 21 | Sep 18 | May 24 | Sep 27 |
| 2012 | Jun 10 | Oct 3 | May 18 | Oct 4 |
| 2011 | Jun 4 | Oct 6 | Jun 3 | Oct 6 |
"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.