Frost history / Saratoga 4N, WY
Saratoga 4N, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00487995, 2011 to 2025, measured from daily minimum temperatures.
Elevation 6,801 ft, 41.505, -106.789. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 24 | Aug 24 |
| Earliest | Jun 6 (2023) | Aug 10 (2025) |
| Latest | Jul 30 (2018) | Sep 19 (2013) |
| Trend | 3.7 days earlier per decade | 8.9 days earlier per decade |
| Years with data | 14 | 14 |
At 28°F (hard freeze) the median last spring date is Jun 9 and the median first fall date is Sep 3.
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 | Jun 25 | Aug 10 | Jun 23 | Aug 10 |
| 2024 | Jul 8 | Aug 30 | May 31 | Aug 30 |
| 2023 | Jun 6 | Aug 14 | May 10 | Sep 24 |
| 2022 | Jun 22 | Sep 10 | Jun 22 | Sep 13 |
| 2021 | Jun 13 | Aug 29 | Jun 12 | Aug 29 |
| 2020 | Jun 18 | Aug 16 | May 26 | Aug 31 |
| 2019 | no data | Aug 27 | no data | Aug 27 |
| 2018 | Jul 30 | Aug 20 | Jun 11 | Sep 14 |
| 2017 | Jun 30 | Sep 6 | Jun 14 | Sep 6 |
| 2016 | Jul 14 | Aug 13 | Jun 2 | Aug 20 |
| 2015 | Jul 29 | Aug 18 | May 16 | Aug 23 |
| 2014 | Jul 2 | Sep 11 | Jun 10 | Sep 12 |
| 2013 | Jun 23 | Sep 19 | Jun 21 | Sep 20 |
| 2012 | Jun 21 | Aug 19 | May 15 | Sep 8 |
| 2011 | Jun 9 | no data | Jun 9 | no data |
"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 1991–2020 frost probabilities.