Salt Lake County and Tooele County
Zones 5b to 7b; most cities fall in 7a and 7b.
The Salt Lake Valley is where the milder end of the northern Utah range lives. Most of the valley floor sits in zones 7a and 7b by the 2023 USDA data, with the benches and the Oquirrh and Wasatch foothills dropping to 6a and 6b. The airport station's average last spring frost is April 26, and USU lists Midvale at May 13 and the West Jordan Conservation Garden at May 10, so a few miles and a few feet of elevation can move planting by weeks.[1]
Tooele, across the Oquirrhs, is a good reminder: USU puts its average last frost at May 7 and its first fall frost at October 14, for 159 frost-free days.[2]
Frost dates
| Town | Average last spring frost | Average first fall frost | Frost-free days |
|---|---|---|---|
| Tooele | May 7 | Oct. 14 | 159 |
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 |
|---|---|---|---|---|---|
| Midvale | May 13 | March 15 | April 1 | May 13 | May 27 |
| Salt Lake International Airport | April 26 | March 15 | March 20 | April 26 | May 15 |
| Salt Lake County, Cottonwood Weir | April 30 | March 15 | March 20 | April 30 | May 15 |
| Tooele | May 7 | March 15 | March 20 | May 7 | May 20 |
| West Jordan Conservation Garden | May 10 | March 15 | April 1 | May 12 | May 27 |
See every crop group and all 36 locations
Which lawn calendar to use
Follow the northern Utah turf calendar. It applies to both Salt Lake and Tooele counties.[3]
Good to know here
- Salt Lake City and Provo offer approved low-water grass seed at a reduced cost through their Turf Trade programs.[4]
- The Slow the Flow rebates page lists Salt Lake City among the places with local programs.[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.
- Salt Lake City7b
- West Valley City7b
- West Jordan7b
- Sandy7b
- South Jordan7a–7b
- Murray7b
- Draper6b–7b
- Herriman7a
- Millcreek7b
- Holladay6a–7b
- Bluffdale7a
- Riverton7a
- Taylorsville7b
- Tooele7a
- Grantsville6a–7a
- Erda7a–7b
- Lake Point7a–7b
- Midvale7b
- Kearns7b
- Magna7b
- White City7b
- Cottonwood Heights6a–7b
- South Salt Lake7b
- Alta5b–6a
- Brighton5b–6a
- Copperton7a–7b
- Emigration Canyon6b–7a
- Rush Valley6a–7a
- Stockton6a–7a
- Vernon6b
- Wendover6b
Other regions
- Utah County
- Northern Utah: Davis, Weber, Cache, Box Elder, Morgan and Rich
- Summit and Wasatch counties
- 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