Summit and Wasatch counties
Zones 5b to 6a; most cities fall in 5b and 6a.
Park City, Heber and Coalville have the shortest seasons of Utah's populated places. USU lists Park City with an average last frost of June 9, a first fall frost of September 1 and just 92 frost-free days.[1] USU's planting table puts Heber's last frost at June 11 and Coalville's at June 18.[2] Most of these towns land in zones 5b and 6a on the 2023 USDA data.
That short window changes what works. USU's table has the tender group (cucumbers, sweet corn, summer squash) going in June 5 at Heber and June 10 at Coalville, and lists the very tender group on May 15 only with a cover over the plants.[2]
Frost dates
| Town | Average last spring frost | Average first fall frost | Frost-free days |
|---|---|---|---|
| Park City | June 9 | Sept. 1 | 92 |
When to plant vegetables
Hardy crops (A) go in first, then semi-hardy (B), tender (C) and very tender (D). (P) means protect with a cover.
| Location | Average last frost | Group A | Group B | Group C | Group D |
|---|---|---|---|---|---|
| Coalville | June 18 | May 1 | May 10 | June 10 | May 15 (P) |
| Heber | June 11 | April 25 | May 5 | June 5 | May 15 (P) |
See every crop group and all 36 locations
Which lawn calendar to use
Follow the northern Utah turf calendar, which lists Summit and Wasatch counties.[3]
Good to know here
- Aspen is adapted to high elevations and wet meadows, and USU says it generally does poorly at most garden altitudes and water levels.[4]
- USU Extension also has a fruit-growing guide for Utah's high mountain valleys.[5]
Zone by city
Zones come from the 2023 USDA map data matched to each city's nearest ZIP codes. A range means the ZIP codes around the city disagree; your own yard may differ, so check your address on the USDA map. Tap a city for its page.
- Park City5b–6a
- Heber City6a
- Midway6a
- Kamas5b–6a
- Charleston6a
- Coalville5b–6a
- Daniel6a
- Francis5b–6a
- Henefer6a
- Hideout5b–6a
- Independence6a
- Interlaken6a
- Oakley5b
- Wallsburg6a
Other regions
- Salt Lake County and Tooele County
- Utah County
- Northern Utah: Davis, Weber, Cache, Box Elder, Morgan and Rich
- Central Utah: Juab, Millard, Sanpete, Sevier, Piute and Wayne
- Southern Utah: Washington, Iron, Kane, Garfield and Beaver
- Eastern Utah: Carbon, Emery, Grand, San Juan, Uintah, Duchesne and Daggett
Sources
- USU Extension, Average Frost Dates by Utah Location (Ask an Expert) ↗
- USU Extension, Suggested Vegetable Planting Dates for Utah ↗
- USU Extension, Northern Utah Turfgrass Management Calendar ↗
- USU Extension Center for Water-Efficient Landscaping, Water-Wise Plants for Utah Landscapes ↗
- USU Extension, Fruit, Vegetable and Herb Growing Guides ↗