Frost history / Park City, UT
Park City, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00426644, 1993 to 2025, measured from daily minimum temperatures.
Elevation 6,900 ft, 40.656, -111.505. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 1 | Sep 15 |
| Earliest | May 9 (2023) | Aug 9 (2002) |
| Latest | Jun 28 (2003) | Oct 18 (2024) |
| Trend | 12.3 days earlier per decade | 13.0 days later per decade |
| Years with data | 14 | 16 |
At 28°F (hard freeze) the median last spring date is May 20 and the median first fall date is Sep 18.
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 20 | Oct 6 | Apr 20 | Oct 22 |
| 2024 | May 24 | Oct 18 | May 24 | Oct 25 |
| 2023 | May 9 | Sep 24 | Apr 28 | Oct 27 |
| 2022 | May 31 | Oct 16 | May 21 | Oct 23 |
| 2020 | no data | Sep 8 | no data | Sep 9 |
| 2019 | Jun 9 | no data | May 10 | no data |
| 2018 | May 15 | Oct 6 | May 12 | Oct 9 |
| 2017 | May 20 | Sep 20 | May 19 | Sep 23 |
| 2016 | May 12 | Sep 25 | Apr 19 | Oct 6 |
| 2007 | Jun 18 | no data | May 29 | no data |
| 2006 | no data | Sep 16 | no data | Sep 17 |
| 2005 | Jun 14 | Aug 31 | Jun 8 | Aug 31 |
| 2004 | Jun 1 | Aug 27 | May 26 | Sep 15 |
| 2003 | Jun 28 | no data | May 20 | no data |
| 2002 | no data | Aug 9 | no data | Sep 19 |
| 2001 | Jun 15 | Sep 7 | Jun 13 | Sep 8 |
| 2000 | no data | Sep 7 | no data | Sep 7 |
| 1999 | Jun 12 | Sep 4 | May 18 | Sep 5 |
| 1993 | no data | Sep 14 | no data | Sep 14 |
"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.