Frost dates for Burris, WY
At Burris, the median last spring frost (32°F) is Jun 1 and the median first fall frost is Sep 14, for a typical growing season of 104 days. For a 90% chance that the last frost has passed, wait until Jun 19. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- Jun 1Last spring frost (median)50% chance of 32°F after this date
- Jun 19Safer planting date10% chance of 32°F after this date
- Sep 14First fall frost (median)50% chance of 32°F by this date
- 104 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 | Jun 4 | Jun 20 | Jul 8 |
| 32°F | May 17 | Jun 1 | Jun 19 |
| 28°F | May 2 | May 15 | May 31 |
| 24°F | Apr 19 | May 1 | May 19 |
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 14 | Sep 1 | Sep 15 |
| 32°F | Sep 1 | Sep 14 | Sep 27 |
| 28°F | Sep 12 | Sep 26 | Oct 10 |
| 24°F | Sep 22 | Oct 5 | Oct 20 |
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 | 45 days | 70 days | 92 days |
| 32°F | 79 days | 104 days | 125 days |
| 28°F | 113 days | 132 days | 152 days |
| 24°F | 133 days | 155 days | 177 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 |
|---|---|---|---|
| 82523 | 5a | -20 to -15°F | 34 km |
| 82512 | 5a | -20 to -15°F | 37 km |
| 82514 | 5a | -20 to -15°F | 39 km |
| 82516 | 5a | -20 to -15°F | 40 km |
| 82513 | 4b | -25 to -20°F | 41 km |
| 82925 | 4b | -25 to -20°F | 47 km |
| 82941 | 4b | -25 to -20°F | 59 km |
| 82510 | 5a | -20 to -15°F | 68 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 USC00481284, at 43.3656, -109.2756, elevation 1867 m (6,125 ft).
- Data quality: Standard (24+ years of data), 26 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
- Diversion Dam (33 km)
- Dubois (36 km)
- Pavillion (49 km)
- Thermopolis 21wnw (61 km)
- Darwin Rch (72 km)
- Pinedale (72 km)
- Riverton (73 km)
- Cora (74 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.