Frost dates for Salt Lake Triad Center, UT
At Salt Lake Triad Center, the median last spring frost (32°F) is Mar 31 and the median first fall frost is Nov 8, for a typical growing season of 224 days. For a 90% chance that the last frost has passed, wait until Apr 19. Nearby ZIP codes are in USDA hardiness zone 7b.
- Mar 31Last spring frost (median)50% chance of 32°F after this date
- Apr 19Safer planting date10% chance of 32°F after this date
- Nov 8First fall frost (median)50% chance of 32°F by this date
- 224 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 | Mar 28 | Apr 18 | May 9 |
| 32°F | Mar 7 | Mar 31 | Apr 19 |
| 28°F | Feb 17 | Mar 8 | Apr 2 |
| 24°F | Jan 31 | Feb 19 | Mar 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 | Oct 12 | Oct 28 | Nov 13 |
| 32°F | Oct 23 | Nov 8 | Nov 25 |
| 28°F | Nov 1 | Nov 18 | Dec 6 |
| 24°F | Nov 11 | Nov 29 | Dec 17 |
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 | 166 days | 194 days | 221 days |
| 32°F | 195 days | 224 days | 254 days |
| 28°F | 223 days | 255 days | 281 days |
| 24°F | 252 days | 284 days | 312 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 |
|---|---|---|---|
| 84180 | 7b | 5 to 10°F | 0 km |
| 84114 | 7b | 5 to 10°F | 1 km |
| 84101 | 7b | 5 to 10°F | 2 km |
| 84111 | 7b | 5 to 10°F | 2 km |
| 84102 | 7b | 5 to 10°F | 3 km |
| 84115 | 7b | 5 to 10°F | 6 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 USC00427606, at 40.7708, -111.8964, elevation 1304 m (4,280 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 81.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Salt Lake City Intl Airport (6 km)
- City Creek Water Plant (7 km)
- Salt Lake City E Bench (8 km)
- Bountiful-Val Verda (9 km)
- Bountiful Bench (14 km)
- Mountain Dell Dam (15 km)
- Cottonwood Weir (19 km)
- Garfield (26 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.