Frost dates for Rawlins Muni Airport, WY
At Rawlins Muni Airport, the median last spring frost (32°F) is Jun 1 and the median first fall frost is Sep 15, for a typical growing season of 105 days. For a 90% chance that the last frost has passed, wait until Jun 17. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- Jun 1Last spring frost (median)50% chance of 32°F after this date
- Jun 17Safer planting date10% chance of 32°F after this date
- Sep 15First fall frost (median)50% chance of 32°F by this date
- 105 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 17 | Jun 1 | Jun 17 |
| 28°F | May 3 | May 17 | Jun 3 |
| 24°F | Apr 20 | May 4 | 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 |
|---|---|---|---|
| 32°F | Sep 3 | Sep 15 | Sep 29 |
| 28°F | Sep 12 | Sep 26 | Oct 9 |
| 24°F | Sep 19 | Oct 4 | 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 | 56 days | 80 days | 99 days |
| 32°F | 85 days | 105 days | 125 days |
| 28°F | 109 days | 130 days | 150 days |
| 24°F | 133 days | 153 days | 174 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 |
|---|---|---|---|
| 82334 | 5a | -20 to -15°F | 25 km |
| 82301 | 5a | -20 to -15°F | 30 km |
| 82335 | 5a | -20 to -15°F | 31 km |
| 82331 | 5a | -20 to -15°F | 55 km |
| 82322 | 5b | -15 to -10°F | 57 km |
| 82327 | 5a | -20 to -15°F | 60 km |
| 82324 | 5a | -20 to -15°F | 66 km |
| 82325 | 5a | -20 to -15°F | 80 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 USW00024057, at 41.8056, -107.1997, elevation 2053 m (6,736 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 192.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rawlins 1n (3 km)
- Seminoe Rsvr Usbr (46 km)
- Saratoga 4n (48 km)
- Saratoga (51 km)
- Leo 6 SW (52 km)
- Muddy Gap (65 km)
- Wamsutter (66 km)
- Elk Mountain (67 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.