Frost history / Glendo Rsvr Usbr, WY
Glendo Rsvr Usbr, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00483944, 2012 to 2025, measured from daily minimum temperatures.
Elevation 4,780 ft, 42.469, -104.966. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 12 | Oct 5 |
| Earliest | Apr 29 (2025) | Sep 8 (2020) |
| Latest | May 22 (2022) | Oct 24 (2015) |
| Trend | 6.6 days earlier per decade | 14.8 days later per decade |
| Years with data | 11 | 12 |
At 28°F (hard freeze) the median last spring date is Apr 30 and the median first fall date is Oct 12.
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 | Apr 29 | Oct 19 | Apr 20 | Oct 21 |
| 2024 | May 4 | Oct 23 | May 4 | Nov 6 |
| 2022 | May 22 | Oct 12 | May 22 | Oct 17 |
| 2021 | May 9 | Oct 12 | Apr 21 | Oct 13 |
| 2020 | May 6 | Sep 8 | Apr 17 | Sep 10 |
| 2019 | May 22 | Oct 3 | May 2 | Oct 3 |
| 2018 | no data | Oct 5 | no data | Oct 11 |
| 2017 | May 18 | no data | Apr 30 | no data |
| 2016 | May 12 | Sep 10 | May 2 | Oct 7 |
| 2015 | May 20 | Oct 24 | Apr 21 | Oct 29 |
| 2014 | May 13 | Sep 11 | Apr 24 | Oct 28 |
| 2013 | May 5 | Oct 4 | May 3 | Oct 4 |
| 2012 | no data | Oct 4 | no data | Oct 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.