Frost dates for Brigham City 28 WNW, UT
At Brigham City 28 WNW, the median last spring frost (32°F) is May 12 and the median first fall frost is Oct 5, for a typical growing season of 144 days. For a 90% chance that the last frost has passed, wait until Jun 8. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 12Last spring frost (median)50% chance of 32°F after this date
- Jun 8Safer planting date10% chance of 32°F after this date
- Oct 5First fall frost (median)50% chance of 32°F by this date
- 144 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 11 | Jun 1 | Jun 19 |
| 32°F | Apr 27 | May 12 | Jun 8 |
| 28°F | Apr 12 | Apr 27 | May 13 |
| 24°F | Mar 19 | Apr 11 | Apr 30 |
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 10 | Sep 25 | Oct 7 |
| 32°F | Sep 24 | Oct 5 | Oct 18 |
| 28°F | Oct 2 | Oct 15 | Oct 27 |
| 24°F | Oct 11 | Oct 24 | Nov 7 |
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 | 89 days | 114 days | 139 days |
| 32°F | 117 days | 144 days | 165 days |
| 28°F | 149 days | 171 days | 190 days |
| 24°F | 174 days | 196 days | 219 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 |
|---|---|---|---|
| 84307 | 6b | -5 to 0°F | 15 km |
| 84336 | 6a | -10 to -5°F | 39 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 USW00004138, at 41.6164, -112.5436, elevation 1509 m (4,951 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 168.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Thiokol Propulsion F S (15 km)
- Tremonton (33 km)
- Brigham City Waste Plant (43 km)
- Cutler Dam (47 km)
- Logan 5 SW Exp. Farm (54 km)
- Logan Radio Kvnu (59 km)
- Logan Cache Airport (60 km)
- Ogden Sugar Factory (61 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.