Frost history / Tonasket 11NE, WA
Tonasket 11NE, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00458521, 2012 to 2025, measured from daily minimum temperatures.
Elevation 3,434 ft, 48.798, -119.260. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 19 | Oct 3 |
| Earliest | Apr 25 (2023) | Sep 11 (2014) |
| Latest | Jun 16 (2024) | Oct 24 (2015) |
| Trend | 3.0 days later per decade | 6.8 days later per decade |
| Years with data | 13 | 14 |
At 28°F (hard freeze) the median last spring date is Apr 25 and the median first fall date is Oct 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 |
|---|---|---|---|---|
| 2025 | May 19 | Oct 13 | Apr 22 | Oct 14 |
| 2024 | Jun 16 | Sep 30 | May 2 | Oct 23 |
| 2023 | Apr 25 | Sep 29 | Apr 21 | Oct 24 |
| 2022 | May 19 | Oct 22 | May 13 | Oct 22 |
| 2021 | Jun 8 | Oct 7 | Apr 13 | Oct 11 |
| 2020 | May 4 | Oct 11 | May 4 | Oct 22 |
| 2019 | Jun 7 | Sep 29 | Apr 30 | Sep 30 |
| 2018 | Jun 11 | Oct 3 | Apr 18 | Oct 3 |
| 2017 | May 15 | Sep 20 | Apr 16 | Oct 11 |
| 2016 | Jun 15 | Oct 10 | Mar 26 | Oct 11 |
| 2015 | May 6 | Oct 24 | Apr 25 | Nov 3 |
| 2014 | May 7 | Sep 11 | Apr 28 | Nov 11 |
| 2013 | May 24 | Oct 1 | May 1 | Oct 29 |
| 2012 | no data | Oct 3 | no data | Oct 21 |
"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.