Frost dates for Roosevelt Radio, UT
At Roosevelt Radio, the median last spring frost (32°F) is May 23 and the median first fall frost is Sep 22, for a typical growing season of 121 days. For a 90% chance that the last frost has passed, wait until Jun 9. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- May 23Last spring frost (median)50% chance of 32°F after this date
- Jun 9Safer planting date10% chance of 32°F after this date
- Sep 22First fall frost (median)50% chance of 32°F by this date
- 121 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 25 | Jun 8 | Jun 27 |
| 32°F | May 9 | May 23 | Jun 9 |
| 28°F | Apr 27 | May 8 | May 25 |
| 24°F | Apr 14 | Apr 28 | May 11 |
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 30 | Sep 12 | Sep 25 |
| 32°F | Sep 8 | Sep 22 | Oct 3 |
| 28°F | Sep 20 | Oct 2 | Oct 15 |
| 24°F | Sep 30 | Oct 13 | Oct 27 |
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 | 72 days | 94 days | 114 days |
| 32°F | 99 days | 121 days | 139 days |
| 28°F | 125 days | 145 days | 163 days |
| 24°F | 148 days | 168 days | 187 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 |
|---|---|---|---|
| 84026 | 5b | -15 to -10°F | 10 km |
| 84066 | 5b | -15 to -10°F | 11 km |
| 84052 | 5b | -15 to -10°F | 14 km |
| 84053 | 6a | -10 to -5°F | 17 km |
| 84076 | 5b | -15 to -10°F | 20 km |
| 84039 | 5b | -15 to -10°F | 21 km |
| 84007 | 5b | -15 to -10°F | 22 km |
| 84063 | 5b | -15 to -10°F | 24 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 USC00427395, at 40.2878, -109.9586, elevation 1528 m (5,014 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 190.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Fort Duchesne (8 km)
- Myton (14 km)
- Neola (16 km)
- Altamont (30 km)
- Ouray 4ne (32 km)
- Maeser 9nw (39 km)
- Duchesne (40 km)
- Vernal (40 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.