Frost dates for Grouse Creek, UT
At Grouse Creek, the median last spring frost (32°F) is Jun 4 and the median first fall frost is Sep 17, for a typical growing season of 104 days. For a 90% chance that the last frost has passed, wait until Jun 22. Nearby ZIP codes are in USDA hardiness zones 5b to 6b.
- Jun 4Last spring frost (median)50% chance of 32°F after this date
- Jun 22Safer planting date10% chance of 32°F after this date
- Sep 17First fall frost (median)50% chance of 32°F by this date
- 104 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 | Jun 4 | Jun 18 | Jul 3 |
| 32°F | May 17 | Jun 4 | Jun 22 |
| 28°F | Apr 30 | May 17 | Jun 10 |
| 24°F | Apr 17 | May 2 | May 21 |
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 | Aug 19 | Sep 5 | Sep 22 |
| 32°F | Aug 31 | Sep 17 | Oct 2 |
| 28°F | Sep 12 | Sep 29 | Oct 13 |
| 24°F | Sep 26 | Oct 11 | Oct 25 |
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 | 55 days | 79 days | 100 days |
| 32°F | 81 days | 104 days | 126 days |
| 28°F | 107 days | 133 days | 156 days |
| 24°F | 137 days | 161 days | 184 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 |
|---|---|---|---|
| 84329 | 6a | -10 to -5°F | 34 km |
| 84313 | 6b | -5 to 0°F | 41 km |
| 83312 | 6a | -10 to -5°F | 48 km |
| 89830 | 5b | -15 to -10°F | 51 km |
| 83346 | 6b | -5 to 0°F | 54 km |
| 83342 | 6a | -10 to -5°F | 70 km |
| 89825 | 5b | -15 to -10°F | 73 km |
| 83344 | 6b | -5 to 0°F | 81 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 USC00423486, at 41.7139, -113.8694, elevation 1622 m (5,320 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 202.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rosette (40 km)
- Utah Test Range (107 km)
- Brigham City 28 WNW (111 km)
- Wendover Airport Awos (111 km)
- Thiokol Propulsion F S (120 km)
- Tremonton (142 km)
- Cutler Dam (151 km)
- Brigham City Waste Plant (153 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.