Frost history / Shoshone, CO
Shoshone, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00057618, 1971 to 2025, measured from daily minimum temperatures.
Elevation 5,992 ft, 39.570, -107.227. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 20 | Oct 17 |
| Earliest | Apr 14 (2005) | Sep 19 (1971) |
| Latest | May 9 (2024) | Oct 31 (2024) |
| Trend | 0.5 days earlier per decade | 5.7 days later per decade |
| Years with data | 10 | 10 |
At 28°F (hard freeze) the median last spring date is Apr 11 and the median first fall date is Oct 29.
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 19 | no data | Apr 7 | no data |
| 2024 | May 9 | Oct 31 | May 9 | Nov 6 |
| 2023 | no data | Oct 29 | no data | Oct 30 |
| 2022 | Apr 15 | Oct 24 | Apr 15 | Oct 25 |
| 2021 | Apr 21 | Oct 15 | Apr 21 | Oct 16 |
| 2019 | Apr 15 | Oct 10 | Mar 21 | Oct 11 |
| 2018 | Apr 20 | Oct 16 | Apr 20 | Oct 16 |
| 2017 | May 1 | Oct 16 | Apr 6 | Nov 19 |
| 2006 | Apr 20 | Oct 18 | Mar 31 | Oct 28 |
| 2005 | Apr 14 | Oct 31 | Apr 2 | Nov 15 |
| 1971 | Apr 28 | Sep 19 | Apr 28 | Oct 30 |
"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.