Frost dates for Milford Muni Airport, UT
At Milford Muni Airport, the median last spring frost (32°F) is May 13 and the median first fall frost is Oct 4, for a typical growing season of 143 days. For a 90% chance that the last frost has passed, wait until Jun 2. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 13Last spring frost (median)50% chance of 32°F after this date
- Jun 2Safer planting date10% chance of 32°F after this date
- Oct 4First fall frost (median)50% chance of 32°F by this date
- 143 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 | May 28 | Jun 12 |
| 32°F | Apr 27 | May 13 | Jun 2 |
| 28°F | Apr 14 | Apr 30 | May 18 |
| 24°F | Mar 27 | Apr 15 | May 4 |
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 13 | Sep 26 | Oct 8 |
| 32°F | Sep 22 | Oct 4 | Oct 18 |
| 28°F | Sep 30 | Oct 14 | Oct 28 |
| 24°F | Oct 8 | Oct 24 | Nov 8 |
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 | 100 days | 121 days | 141 days |
| 32°F | 120 days | 143 days | 164 days |
| 28°F | 142 days | 164 days | 188 days |
| 24°F | 163 days | 189 days | 215 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 |
|---|---|---|---|
| 84751 | 6a | -10 to -5°F | 10 km |
| 84752 | 6a | -10 to -5°F | 22 km |
| 84731 | 6a | -10 to -5°F | 34 km |
| 84713 | 6a | -10 to -5°F | 45 km |
| 84637 | 6b | -5 to 0°F | 57 km |
| 84760 | 6a | -10 to -5°F | 60 km |
| 84766 | 6a | -10 to -5°F | 62 km |
| 84761 | 6a | -10 to -5°F | 64 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 USW00023176, at 38.4167, -113.0167, elevation 1536 m (5,040 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 166.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Milford (2 km)
- Black Rock (33 km)
- Wah Wah Rch (36 km)
- Beaver Canyon Power House (49 km)
- Fremont Indian State Park (62 km)
- Kanosh (66 km)
- Marysvale (69 km)
- Circleville (70 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.