Frost history / Leo 6 Sw, WY
Leo 6 Sw, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00485525, 1978 to 2025, measured from daily minimum temperatures.
Elevation 6,035 ft, 42.195, -106.856. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 30 | Sep 21 |
| Earliest | Apr 29 (2023) | Aug 20 (2016) |
| Latest | Jun 22 (2013) | Oct 7 (2025) |
| Trend | 13.1 days earlier per decade | 1.6 days later per decade |
| Years with data | 14 | 15 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Oct 4.
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 23 | Oct 7 | May 3 | Oct 7 |
| 2024 | May 31 | Sep 22 | May 23 | Oct 30 |
| 2023 | Apr 29 | Sep 24 | Apr 25 | Oct 14 |
| 2022 | Jun 1 | Oct 6 | May 24 | Oct 16 |
| 2021 | May 31 | Sep 21 | May 9 | Oct 12 |
| 2020 | May 25 | Sep 8 | May 11 | Sep 8 |
| 2019 | Jun 12 | Sep 23 | May 24 | Oct 3 |
| 2018 | Jun 2 | Sep 21 | May 2 | Sep 25 |
| 2017 | May 29 | Sep 20 | May 21 | Sep 26 |
| 2016 | May 18 | Aug 20 | May 11 | Oct 6 |
| 2015 | May 20 | Aug 23 | Apr 21 | Oct 16 |
| 2014 | May 14 | Sep 11 | May 14 | Sep 12 |
| 2013 | Jun 22 | Sep 20 | Jun 22 | Oct 4 |
| 2012 | Jun 20 | Oct 4 | Jun 20 | Oct 4 |
| 1978 | no data | Sep 19 | no data | Sep 19 |
"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.