Frost history / Spokane 17 Ssw, WA
Spokane 17 Ssw, WA: frost dates by year
Last spring and first fall frost at NOAA station USW00004136, 2007 to 2024, measured from daily minimum temperatures.
Elevation 2,267 ft, 47.417, -117.526. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 11 | Aug 27 |
| Earliest | May 4 (2019) | Aug 11 (2007) |
| Latest | Jul 31 (2008) | Sep 25 (2019) |
| Trend | 3.9 days earlier per decade | 4.0 days later per decade |
| Years with data | 17 | 18 |
At 28°F (hard freeze) the median last spring date is May 9 and the median first fall date is Sep 10.
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 17 | Aug 29 | Jun 17 | Sep 21 |
| 2023 | May 25 | Aug 24 | Apr 28 | Sep 29 |
| 2022 | May 24 | Sep 6 | May 22 | Sep 8 |
| 2021 | Jun 11 | Aug 24 | May 29 | Aug 24 |
| 2020 | Jul 13 | Aug 14 | May 8 | Sep 8 |
| 2019 | May 4 | Sep 25 | Apr 30 | Sep 25 |
| 2018 | Jun 12 | Sep 2 | Apr 23 | Sep 13 |
| 2017 | Jun 11 | Aug 25 | Apr 16 | Sep 15 |
| 2016 | Jun 17 | Sep 4 | Apr 25 | Sep 4 |
| 2015 | Jun 14 | Aug 23 | May 10 | Sep 4 |
| 2014 | Jun 11 | Sep 4 | May 12 | Sep 11 |
| 2013 | Jun 1 | Aug 21 | May 24 | Oct 3 |
| 2012 | Jun 7 | Aug 25 | May 12 | Sep 11 |
| 2011 | May 18 | Sep 3 | May 4 | Sep 20 |
| 2010 | May 25 | Aug 29 | May 25 | Aug 29 |
| 2009 | May 22 | Sep 4 | May 1 | Sep 8 |
| 2008 | Jul 31 | Aug 22 | May 9 | Sep 1 |
| 2007 | no data | Aug 11 | no data | Sep 9 |
"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.