Frost history / Trenton, UT
Trenton, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00428828, 1976 to 2025, measured from daily minimum temperatures.
Elevation 4,455 ft, 41.915, -111.913. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 26 | Sep 20 |
| Earliest | Apr 28 (1998) | Aug 2 (2012) |
| Latest | Jun 21 (1989) | Oct 28 (2010) |
| Trend | 1.7 days earlier per decade | 3.8 days later per decade |
| Years with data | 34 | 35 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 1.
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 19 | Oct 7 | Apr 19 | Oct 13 |
| 2024 | Jun 18 | Oct 19 | May 2 | Oct 25 |
| 2023 | Apr 28 | Oct 15 | Apr 23 | Oct 27 |
| 2022 | Jun 15 | Oct 12 | May 23 | Oct 14 |
| 2021 | Jun 11 | Sep 21 | Apr 24 | Sep 21 |
| 2020 | Jun 9 | no data | May 8 | no data |
| 2019 | May 10 | Aug 27 | May 2 | Aug 27 |
| 2018 | May 3 | Sep 21 | Apr 18 | Sep 25 |
| 2017 | May 19 | Sep 23 | Apr 29 | Oct 3 |
| 2016 | May 12 | Sep 10 | Apr 6 | Oct 7 |
| 2014 | May 14 | Sep 12 | May 13 | Oct 13 |
| 2013 | May 3 | Sep 20 | May 3 | Oct 5 |
| 2012 | Jun 6 | Aug 2 | May 6 | Aug 3 |
| 2011 | May 31 | Oct 9 | Mar 4 | Oct 26 |
| 2010 | May 5 | Oct 28 | Mar 20 | Nov 24 |
| 2009 | no data | Oct 6 | no data | Nov 9 |
| 2002 | Jun 10 | Oct 10 | May 8 | Oct 12 |
| 2001 | Jun 5 | Sep 8 | May 7 | Oct 10 |
| 2000 | Jun 1 | Sep 23 | Apr 11 | Sep 24 |
| 1999 | May 17 | Sep 27 | May 11 | Sep 27 |
| 1998 | Apr 28 | Oct 5 | Apr 25 | Oct 6 |
| 1993 | Jun 13 | no data | May 1 | no data |
| 1992 | no data | Aug 24 | no data | Aug 26 |
| 1989 | Jun 21 | Sep 4 | Jun 21 | Sep 11 |
| 1988 | May 20 | Sep 19 | May 3 | Sep 19 |
| 1987 | May 4 | Sep 17 | Apr 21 | Sep 17 |
| 1986 | May 23 | Sep 11 | May 23 | Sep 28 |
| 1985 | May 14 | Sep 13 | May 14 | Sep 23 |
| 1984 | Jun 2 | Sep 22 | May 8 | Sep 22 |
| 1983 | May 15 | Sep 20 | May 13 | Sep 20 |
| 1982 | Jun 9 | Oct 2 | May 12 | Oct 6 |
| 1981 | Jun 14 | Sep 26 | May 13 | Sep 26 |
| 1980 | May 14 | Aug 27 | Apr 18 | Sep 22 |
| 1979 | Jun 9 | Sep 11 | May 31 | Oct 4 |
| 1978 | Jun 11 | Sep 18 | May 31 | Sep 20 |
| 1977 | May 30 | Sep 9 | May 6 | Oct 1 |
| 1976 | no data | Aug 27 | no data | Oct 5 |
"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.