Frost dates for Pavillion, WY
At Pavillion, the median last spring frost (32°F) is May 14 and the median first fall frost is Sep 30, for a typical growing season of 139 days. For a 90% chance that the last frost has passed, wait until May 29. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 14Last spring frost (median)50% chance of 32°F after this date
- May 29Safer planting date10% chance of 32°F after this date
- Sep 30First fall frost (median)50% chance of 32°F by this date
- 139 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 13 | May 29 | Jun 12 |
| 32°F | Apr 30 | May 14 | May 29 |
| 28°F | Apr 18 | May 2 | May 17 |
| 24°F | Apr 6 | Apr 21 | May 6 |
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 7 | Sep 21 | Oct 3 |
| 32°F | Sep 18 | Sep 30 | Oct 15 |
| 28°F | Sep 26 | Oct 9 | Oct 26 |
| 24°F | Oct 4 | Oct 20 | Nov 2 |
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 | 93 days | 114 days | 135 days |
| 32°F | 117 days | 139 days | 158 days |
| 28°F | 138 days | 158 days | 180 days |
| 24°F | 158 days | 178 days | 200 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 |
|---|---|---|---|
| 82516 | 5a | -20 to -15°F | 11 km |
| 82523 | 5a | -20 to -15°F | 22 km |
| 82510 | 5a | -20 to -15°F | 28 km |
| 82514 | 5a | -20 to -15°F | 33 km |
| 82515 | 5a | -20 to -15°F | 40 km |
| 82501 | 5a | -20 to -15°F | 44 km |
| 82512 | 5a | -20 to -15°F | 51 km |
| 82649 | 4b | -25 to -20°F | 55 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 USC00487115, at 43.2458, -108.6942, elevation 1670 m (5,480 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 183.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Diversion Dam (18 km)
- Riverton (27 km)
- Riverton (35 km)
- Boysen Dam (46 km)
- Shoshoni (47 km)
- Lander Hunt Field Airport (48 km)
- Burris (49 km)
- Thermopolis 21wnw (53 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.