Zones across Utah
Share of Utah's 337 ZIP codes in each zone:
Frost dates in Utah
Median 32°F freeze dates across 337 ZIP codes with a NOAA weather station within 60 km, from the 1991 to 2020 climate normals. Frost dates vary a lot inside a state, so look up your ZIP code for your own dates.
Sources: NOAA NCEI U.S. Climate Normals 1991 to 2020; Purdue Extension, Indiana Vegetable Planting Calendar (HO-186-W).
Places in each zone
| Zone | Average coldest night | Example places |
|---|---|---|
| 4a | -30 to -25°F (-34 to -32°C) | Randolph |
| 5a | -20 to -15°F (-29 to -26°C) | Garden City, Hanna, Woodruff |
| 5b | -15 to -10°F (-26 to -23°C) | Park City, Altamont, Bluebell, Coalville, Dutch John, Fort Duchesne |
| 6a | -10 to -5°F (-23 to -21°C) | Logan, Altonah, American Fork, Bonanza, Cedar Valley, Croydon |
| 6b | -5 to 0°F (-21 to -18°C) | Ogden, Salt Lake City, Cedar City, Eagle Mountain, Bountiful, Centerville |
| 7a | 0 to 5°F (-18 to -15°C) | Ogden, Orem, Salt Lake City, Provo, Clearfield, South Jordan |
| 7b | 5 to 10°F (-15 to -12°C) | Salt Lake City, Sandy, West Jordan, West Valley City, Farmington, Kaysville |
| 8a | 10 to 15°F (-12 to -9°C) | Lake Powell, Monument Valley, Gunlock, La Verkin, Rockville, Santa Clara |
| 8b | 15 to 20°F (-9 to -7°C) | Saint George, Hurricane, Ivins, Leeds, Toquerville, Washington |
Zones for cities in Utah
Using your zone in Utah
Zones measure winter cold only: the average of the coldest night each year from 1991 to 2020. Within Utah, zones change with elevation, latitude and distance from large bodies of water, so two towns a short drive apart can differ by a half zone or more. Check your own ZIP code, then pick perennials, shrubs and trees whose tag range includes your zone.
What changed on the 2023 map
The 2023 map, released by the USDA and Oregon State University's PRISM Climate Group, uses weather data from 1991 to 2020 and far more weather stations than the 2012 map. Nationally, about half the country moved to the next warmer half zone and the rest stayed in the same half zone, so if your plant tags or old garden notes use a 2012 zone for Utah, it is worth checking your ZIP code again.
Frequently asked questions
What planting zone is Utah?
Utah spans USDA plant hardiness zones 4a to 8b on the 2023 map. The most common zone by ZIP code is 6a.
How do I find my exact zone in Utah?
Zones can change over short distances with elevation and nearness to water. Enter your ZIP code in the zone finder for the zone the 2023 USDA map gives your ZIP code.
Zones: 2023 USDA Plant Hardiness Zone Map ZIP code listings, PRISM Climate Group, Oregon State University. Place names: GeoNames (CC BY 4.0). Not the official USDA map.