Frost history / Matlock 8 S, WA
Matlock 8 S, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00455086, 2011 to 2025, measured from daily minimum temperatures.
Elevation 110 ft, 47.146, -123.401. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 26 | Oct 12 |
| Earliest | Apr 14 (2014) | Sep 12 (2012) |
| Latest | May 17 (2011) | Nov 28 (2024) |
| Trend | 7.3 days earlier per decade | 13.8 days later per decade |
| Years with data | 15 | 15 |
At 28°F (hard freeze) the median last spring date is Mar 23 and the median first fall date is Nov 6.
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 5 | Oct 14 | Mar 18 | none |
| 2024 | Apr 22 | Nov 28 | Apr 18 | none |
| 2023 | Apr 20 | Sep 30 | Apr 5 | Oct 27 |
| 2022 | May 11 | Nov 3 | Mar 11 | Nov 9 |
| 2021 | Apr 15 | Oct 12 | Apr 14 | Dec 27 |
| 2020 | Apr 17 | Oct 23 | Apr 13 | Oct 25 |
| 2019 | Apr 30 | Sep 30 | Mar 12 | Oct 10 |
| 2018 | Apr 23 | Oct 14 | Mar 5 | Nov 8 |
| 2017 | May 6 | Oct 3 | Feb 25 | Nov 4 |
| 2016 | Apr 26 | Oct 11 | Jan 3 | Dec 7 |
| 2015 | Apr 25 | Sep 28 | Mar 7 | Nov 23 |
| 2014 | Apr 14 | Nov 8 | Mar 23 | Nov 14 |
| 2013 | May 2 | Oct 10 | May 1 | Oct 29 |
| 2012 | May 11 | Sep 12 | Apr 6 | Oct 2 |
| 2011 | May 17 | Oct 24 | Apr 18 | Nov 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.