Frost history / Powder Rvr (School), WY
Powder Rvr (School), WY: frost dates by year
Last spring and first fall frost at NOAA station USC00487375, 2010 to 2023, measured from daily minimum temperatures.
Elevation 5,722 ft, 43.035, -106.989. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 26 | Sep 20 |
| Earliest | May 11 (2016) | Aug 31 (2020) |
| Latest | Jun 12 (2018) | Oct 16 (2015) |
| Trend | 4.8 days earlier per decade | 14.1 days later per decade |
| Years with data | 14 | 13 |
At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Sep 28.
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 |
|---|---|---|---|---|
| 2023 | May 11 | no data | Apr 29 | no data |
| 2022 | May 25 | Oct 8 | May 23 | Oct 16 |
| 2021 | May 28 | Sep 17 | May 13 | Sep 17 |
| 2020 | May 25 | Aug 31 | May 24 | Sep 8 |
| 2019 | Jun 11 | Oct 1 | Jun 9 | Oct 3 |
| 2018 | Jun 12 | Sep 21 | May 2 | Sep 21 |
| 2017 | May 20 | Sep 22 | May 20 | Oct 3 |
| 2016 | May 11 | Oct 7 | Apr 11 | Oct 12 |
| 2015 | May 12 | Oct 16 | May 12 | Oct 29 |
| 2014 | May 15 | Sep 11 | May 13 | Sep 12 |
| 2013 | Jun 5 | Sep 20 | May 3 | Sep 28 |
| 2012 | May 29 | Sep 12 | May 12 | Oct 4 |
| 2011 | Jun 4 | Sep 4 | May 16 | Sep 21 |
| 2010 | May 31 | Sep 3 | May 14 | Sep 7 |
"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.