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Utah frost dates
Across the 16Utah weather stations below, the average last spring frost ranges from Apr 8 in Salt Lake to Jun 7 in Coalville. The statewide middle is about May 6 for the last spring frost and Oct 6 for the first fall frost. Salt Lake has the longest growing season, about 206 days. Hardiness zones in these places: 5b, 6a, 6b, 7a, 7b.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Salt Lake | 7b | Apr 8 | Apr 30 | Oct 31 | 206 |
| Granite Peak Dugway Pg | 6b | Apr 18 | May 5 | Oct 16 | 181 |
| Wendover | 6b | Apr 18 | May 5 | Oct 23 | 188 |
| Moab Canyonland | 6b | Apr 22 | May 8 | Oct 20 | 181 |
| Ogden Hinkley | 7a | Apr 22 | May 10 | Oct 22 | 183 |
| Torrey 7 E | 6a | Apr 22 | May 9 | Oct 23 | 184 |
| Price Carbon | 6a | May 3 | May 21 | Oct 12 | 162 |
| Hanksville | 7a | May 5 | May 23 | Oct 3 | 151 |
| Vernal | 5b | May 6 | May 25 | Oct 7 | 154 |
| Logan Cache | 6a | May 8 | May 29 | Oct 2 | 147 |
| Brigham 28 Wnw | 6b | May 12 | Jun 8 | Oct 5 | 146 |
| Milford | 6a | May 13 | Jun 2 | Oct 4 | 144 |
| Delta | 6a | May 16 | Jun 5 | Sep 29 | 136 |
| Modena | 5b | May 20 | Jun 6 | Oct 3 | 136 |
| Cedar | 6b | May 21 | Jun 8 | Sep 29 | 131 |
| Coalville | 6a | Jun 7 | Jun 25 | Sep 12 | 97 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Utah
Using the statewide middle dates (last frost May 6, first frost Oct 6). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Utah |
|---|---|
| Tomatoes | May 13 – May 27 |
| Peas | Mar 25 – Apr 15; fall: Jul 14 – Aug 4 |
| Potatoes | Apr 8 – Apr 29 |
| Green beans | May 13 – May 27; fall: Jul 21 – Aug 4 |
| Garlic | Oct 6 – Nov 3 |
| Tulips | Sep 22 – Nov 3 |