Frost dates for Mountain View, WY
At Mountain View, the median last spring frost (32°F) is Jun 14 and the median first fall frost is Sep 9, for a typical growing season of 84 days. For a 90% chance that the last frost has passed, wait until Jul 1. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- Jun 14Last spring frost (median)50% chance of 32°F after this date
- Jul 1Safer planting date10% chance of 32°F after this date
- Sep 9First fall frost (median)50% chance of 32°F by this date
- 84 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 |
|---|---|---|---|
| 32°F | May 31 | Jun 14 | Jul 1 |
| 28°F | May 15 | May 30 | Jun 17 |
| 24°F | Apr 29 | May 14 | Jun 1 |
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 |
|---|---|---|---|
| 32°F | Aug 23 | Sep 9 | Sep 21 |
| 28°F | Sep 5 | Sep 20 | Oct 1 |
| 24°F | Sep 16 | Sep 30 | Oct 16 |
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 | 36 days | 60 days | 80 days |
| 32°F | 59 days | 84 days | 104 days |
| 28°F | 88 days | 109 days | 131 days |
| 24°F | 114 days | 137 days | 160 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 |
|---|---|---|---|
| 82939 | 5b | -15 to -10°F | 5 km |
| 82937 | 5a | -20 to -15°F | 11 km |
| 82933 | 5b | -15 to -10°F | 13 km |
| 82944 | 5a | -20 to -15°F | 20 km |
| 82936 | 5b | -15 to -10°F | 27 km |
| 82930 | 5a | -20 to -15°F | 41 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 USC00486555, at 41.2658, -110.3375, elevation 2073 m (6,800 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 206.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Church Buttes Gas Plant (25 km)
- Evanston 1 E (51 km)
- Evanston Burns Field (58 km)
- Buckboard Marina (62 km)
- Kemmerer 2n (64 km)
- Fossil Butte (73 km)
- Green River (78 km)
- Fontenelle Dam (83 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.