Frost dates for Tremonton, UT
At Tremonton, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 17, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 175 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 | Apr 23 | May 6 | May 29 |
| 32°F | Apr 8 | Apr 24 | May 9 |
| 28°F | Mar 20 | Apr 9 | Apr 26 |
| 24°F | Mar 6 | Mar 22 | Apr 10 |
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 25 | Oct 7 | Oct 19 |
| 32°F | Oct 3 | Oct 17 | Nov 1 |
| 28°F | Oct 14 | Oct 26 | Nov 10 |
| 24°F | Oct 20 | Nov 6 | Nov 21 |
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 | 129 days | 152 days | 171 days |
| 32°F | 154 days | 175 days | 194 days |
| 28°F | 177 days | 199 days | 221 days |
| 24°F | 200 days | 225 days | 249 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 84309 | 6b | -5 to 0°F | 5 km |
| 84312 | 6b | -5 to 0°F | 7 km |
| 84334 | 6b | -5 to 0°F | 9 km |
| 84314 | 6b | -5 to 0°F | 9 km |
| 84337 | 6b | -5 to 0°F | 10 km |
| 84301 | 6b | -5 to 0°F | 11 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 USC00428817, at 41.7108, -112.1636, elevation 1314 m (4,310 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 132.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cutler Dam (16 km)
- Thiokol Propulsion F S (22 km)
- Brigham City Waste Plant (23 km)
- Logan 5 SW Exp. Farm (23 km)
- Logan Radio Kvnu (26 km)
- Logan Cache Airport (27 km)
- Logan Utah St. Univ (30 km)
- Trenton (31 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.