Frost history / Rosette, UT
Rosette, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00427408, 1990 to 2025, measured from daily minimum temperatures.
Elevation 5,685 ft, 41.819, -113.413. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 23 | Oct 2 |
| Earliest | Apr 27 (2015) | Aug 26 (1992) |
| Latest | Jun 15 (2022) | Oct 28 (2025) |
| Trend | 1.4 days earlier per decade | 5.4 days later per decade |
| Years with data | 27 | 31 |
At 28°F (hard freeze) the median last spring date is May 3 and the median first fall date is Oct 6.
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 28 | Apr 19 | Oct 28 |
| 2024 | May 8 | Oct 24 | May 2 | Oct 30 |
| 2023 | May 5 | Oct 26 | Apr 20 | Oct 27 |
| 2022 | Jun 15 | Oct 23 | May 11 | Oct 24 |
| 2021 | Jun 12 | Sep 20 | Apr 27 | Oct 13 |
| 2020 | Jun 9 | Sep 9 | May 24 | Oct 23 |
| 2019 | Jun 9 | Sep 30 | May 2 | Sep 30 |
| 2018 | May 1 | Sep 26 | May 1 | Sep 26 |
| 2017 | May 27 | Sep 20 | May 18 | Oct 3 |
| 2016 | May 22 | Oct 6 | Apr 6 | Oct 12 |
| 2015 | Apr 27 | Oct 27 | Apr 27 | Nov 4 |
| 2014 | no data | Oct 2 | no data | Oct 22 |
| 2013 | May 24 | no data | May 1 | no data |
| 2012 | no data | Oct 6 | no data | Oct 6 |
| 2009 | no data | Sep 21 | no data | Sep 30 |
| 2008 | May 12 | Oct 10 | May 10 | Oct 10 |
| 2007 | May 24 | Sep 30 | May 4 | Sep 30 |
| 2006 | no data | Sep 17 | no data | Oct 18 |
| 2005 | May 13 | Sep 25 | Apr 20 | Oct 6 |
| 2004 | May 29 | no data | May 29 | no data |
| 2003 | May 20 | Sep 18 | May 20 | Oct 11 |
| 2002 | no data | Oct 12 | no data | Oct 12 |
| 2001 | Jun 14 | Oct 5 | May 6 | Oct 5 |
| 2000 | Jun 1 | Sep 24 | May 12 | Sep 24 |
| 1999 | Jun 9 | Sep 27 | May 16 | Sep 28 |
| 1998 | May 23 | Oct 5 | May 23 | Oct 6 |
| 1997 | May 3 | Oct 4 | May 3 | Oct 4 |
| 1996 | May 19 | Sep 17 | Apr 28 | Sep 24 |
| 1995 | Jun 10 | Sep 21 | May 13 | Sep 21 |
| 1994 | Apr 29 | Oct 3 | Apr 29 | Oct 20 |
| 1993 | May 10 | Oct 8 | May 9 | Oct 9 |
| 1992 | Jun 13 | Aug 26 | Apr 23 | Oct 4 |
| 1990 | no data | Oct 4 | no data | Oct 4 |
"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.