Frost dates for Moose, WY
At Moose, the median last spring frost (32°F) is Jun 20 and the median first fall frost is Aug 31, for a typical growing season of 70 days. For a 90% chance that the last frost has passed, wait until Jul 9. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- Jun 20Last spring frost (median)50% chance of 32°F after this date
- Jul 9Safer planting date10% chance of 32°F after this date
- Aug 31First fall frost (median)50% chance of 32°F by this date
- 70 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 | Jun 5 | Jun 20 | Jul 9 |
| 28°F | May 12 | Jun 2 | Jun 21 |
| 24°F | Apr 29 | May 12 | Jun 2 |
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 12 | Aug 31 | Sep 13 |
| 28°F | Aug 30 | Sep 13 | Sep 30 |
| 24°F | Sep 12 | Sep 27 | Oct 12 |
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 | 23 days | 38 days | 60 days |
| 32°F | 43 days | 70 days | 93 days |
| 28°F | 80 days | 106 days | 129 days |
| 24°F | 112 days | 136 days | 156 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 |
|---|---|---|---|
| 83025 | 4b | -25 to -20°F | 12 km |
| 83011 | 5a | -20 to -15°F | 16 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 USC00486428, at 43.6536, -110.7169, elevation 1964 m (6,444 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 244.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Moose 1 NNE (1 km)
- Jackson (19 km)
- Moran 5wnw (25 km)
- Alta 1 NNW (29 km)
- Darwin Rch (52 km)
- Snake River (54 km)
- Bondurant (56 km)
- Dubois (86 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.