Frost dates for Clearmont 5 SW, WY
At Clearmont 5 SW, the median last spring frost (32°F) is May 24 and the median first fall frost is Sep 16, for a typical growing season of 114 days. For a 90% chance that the last frost has passed, wait until Jun 8. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 24Last spring frost (median)50% chance of 32°F after this date
- Jun 8Safer planting date10% chance of 32°F after this date
- Sep 16First fall frost (median)50% chance of 32°F by this date
- 114 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 25 | Jun 7 | Jun 25 |
| 32°F | May 12 | May 24 | Jun 8 |
| 28°F | Apr 30 | May 10 | May 23 |
| 24°F | Apr 15 | Apr 30 | May 12 |
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 | Aug 26 | Sep 7 | Sep 20 |
| 32°F | Sep 3 | Sep 16 | Oct 1 |
| 28°F | Sep 13 | Sep 27 | Oct 11 |
| 24°F | Sep 22 | Oct 7 | Oct 21 |
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 | 71 days | 90 days | 109 days |
| 32°F | 93 days | 114 days | 132 days |
| 28°F | 119 days | 138 days | 156 days |
| 24°F | 140 days | 161 days | 179 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 |
|---|---|---|---|
| 82835 | 5a | -20 to -15°F | 21 km |
| 82837 | 4b | -25 to -20°F | 21 km |
| 82832 | 5a | -20 to -15°F | 25 km |
| 82845 | 5a | -20 to -15°F | 30 km |
| 82831 | 4b | -25 to -20°F | 34 km |
| 82842 | 5a | -20 to -15°F | 39 km |
| 82834 | 5a | -20 to -15°F | 42 km |
| 82801 | 5a | -20 to -15°F | 45 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 USC00481816, at 44.5781, -106.4472, elevation 1218 m (3,995 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 197.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Buffalo Johnson Co Airport (31 km)
- Buffalo (32 km)
- Leiter 9n (33 km)
- Story (36 km)
- Sheridan Field Station (43 km)
- Echeta 2 NW (45 km)
- Big Horn (46 km)
- Sheridan Co Airport (46 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.