Frost history / Sunnyside City, UT
Sunnyside City, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00428476, 2009 to 2025, measured from daily minimum temperatures.
Elevation 6,511 ft, 39.551, -110.390. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 2 | Oct 16 |
| Earliest | Apr 13 (2012) | Sep 9 (2020) |
| Latest | Jun 22 (2019) | Nov 1 (2024) |
| Trend | little change (less than half a day per decade) | 7.6 days later per decade |
| Years with data | 13 | 13 |
At 28°F (hard freeze) the median last spring date is Apr 16 and the median first fall date is Oct 27.
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 20 | Oct 29 | Apr 19 | Dec 2 |
| 2024 | May 9 | Nov 1 | May 9 | Nov 7 |
| 2023 | Apr 21 | Oct 28 | Apr 21 | Oct 30 |
| 2022 | May 6 | Oct 25 | Apr 15 | Oct 25 |
| 2021 | Apr 18 | Oct 16 | Mar 31 | Oct 16 |
| 2020 | Apr 17 | Sep 9 | Apr 16 | Oct 27 |
| 2019 | Jun 22 | Oct 10 | Apr 13 | Oct 10 |
| 2018 | May 3 | Oct 13 | Apr 18 | Oct 14 |
| 2017 | no data | Sep 25 | no data | Oct 3 |
| 2013 | May 6 | no data | Apr 19 | no data |
| 2012 | Apr 13 | Oct 25 | Apr 7 | Oct 26 |
| 2011 | May 2 | Oct 7 | Apr 30 | Nov 3 |
| 2010 | May 7 | Oct 26 | Apr 7 | Nov 10 |
| 2009 | Apr 27 | Oct 1 | Apr 16 | Oct 29 |
"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.