Frost history / Monticello #2, UT
Monticello #2, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00425807, 2011 to 2025, measured from daily minimum temperatures.
Elevation 7,086 ft, 37.867, -109.351. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Oct 7 |
| Earliest | Apr 29 (2023) | Sep 9 (2020) |
| Latest | Jun 9 (2020) | Oct 28 (2014) |
| Trend | 2.4 days later per decade | 1.5 days later per decade |
| Years with data | 13 | 15 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 24.
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 16 | May 20 | Nov 7 |
| 2024 | May 22 | Oct 21 | May 9 | Oct 30 |
| 2023 | Apr 29 | Oct 3 | Apr 22 | Oct 29 |
| 2022 | May 22 | Oct 18 | May 4 | Oct 24 |
| 2021 | May 23 | Oct 11 | Apr 24 | Oct 13 |
| 2020 | Jun 9 | Sep 9 | Apr 17 | Oct 26 |
| 2019 | May 28 | Oct 2 | May 22 | Oct 11 |
| 2018 | no data | Oct 8 | no data | Oct 15 |
| 2017 | May 20 | Sep 25 | May 19 | Oct 10 |
| 2016 | May 9 | Oct 4 | May 1 | Oct 4 |
| 2015 | May 17 | Oct 27 | May 10 | Oct 29 |
| 2014 | May 15 | Oct 28 | May 14 | Oct 28 |
| 2013 | May 4 | Sep 28 | May 2 | Oct 4 |
| 2012 | May 29 | Oct 7 | Apr 17 | Oct 25 |
| 2011 | no data | Oct 7 | no data | Oct 7 |
"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.