Frost dates for Wah Wah Rch, UT
At Wah Wah Rch, the median last spring frost (32°F) is May 19 and the median first fall frost is Sep 29, for a typical growing season of 131 days. For a 90% chance that the last frost has passed, wait until Jun 11. Nearby ZIP codes are in USDA hardiness zones 5b to 7a.
- May 19Last spring frost (median)50% chance of 32°F after this date
- Jun 11Safer planting date10% chance of 32°F after this date
- Sep 29First fall frost (median)50% chance of 32°F by this date
- 131 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 16 | Jun 3 | Jun 25 |
| 32°F | Apr 30 | May 19 | Jun 11 |
| 28°F | Apr 20 | May 4 | May 23 |
| 24°F | Apr 7 | Apr 25 | May 12 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 6 | Sep 20 | Oct 1 |
| 32°F | Sep 16 | Sep 29 | Oct 12 |
| 28°F | Sep 24 | Oct 8 | Oct 21 |
| 24°F | Oct 3 | Oct 19 | Nov 2 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 83 days | 108 days | 128 days |
| 32°F | 105 days | 131 days | 152 days |
| 28°F | 132 days | 153 days | 174 days |
| 24°F | 151 days | 175 days | 197 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 84751 | 6a | -10 to -5°F | 46 km |
| 84752 | 6a | -10 to -5°F | 54 km |
| 84731 | 6a | -10 to -5°F | 67 km |
| 84753 | 7a | 0 to 5°F | 69 km |
| 84714 | 5b | -15 to -10°F | 78 km |
| 84713 | 6a | -10 to -5°F | 81 km |
| 84756 | 5b | -15 to -10°F | 83 km |
| 84721 | 6b | -5 to 0°F | 83 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00429152, at 38.4831, -113.4264, elevation 1487 m (4,880 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 161.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Milford Muni Airport (36 km)
- Milford (37 km)
- Black Rock (48 km)
- Enterprise Beryl Junction (82 km)
- Eskdale (83 km)
- Beaver Canyon Power House (86 km)
- Modena (88 km)
- Cedar City Muni Airport (91 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.