Frost dates for Gillette Campbell Airport, WY
At Gillette Campbell Airport, the median last spring frost (32°F) is May 22 and the median first fall frost is Sep 25, for a typical growing season of 125 days. For a 90% chance that the last frost has passed, wait until Jun 4. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 22Last spring frost (median)50% chance of 32°F after this date
- Jun 4Safer planting date10% chance of 32°F after this date
- Sep 25First fall frost (median)50% chance of 32°F by this date
- 125 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 21 | Jun 3 | Jun 18 |
| 32°F | May 8 | May 22 | Jun 4 |
| 28°F | Apr 24 | May 9 | May 22 |
| 24°F | Apr 12 | Apr 28 | May 11 |
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 1 | Sep 15 | Sep 29 |
| 32°F | Sep 9 | Sep 25 | Oct 8 |
| 28°F | Sep 20 | Oct 4 | Oct 18 |
| 24°F | Sep 28 | Oct 13 | Oct 26 |
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 | 82 days | 101 days | 122 days |
| 32°F | 106 days | 125 days | 146 days |
| 28°F | 127 days | 148 days | 168 days |
| 24°F | 148 days | 169 days | 190 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 |
|---|---|---|---|
| 82716 | 5a | -20 to -15°F | 23 km |
| 82727 | 4b | -25 to -20°F | 27 km |
| 82718 | 5a | -20 to -15°F | 47 km |
| 82721 | 4b | -25 to -20°F | 53 km |
| 82831 | 4b | -25 to -20°F | 54 km |
| 82731 | 4b | -25 to -20°F | 57 km |
| 82725 | 5a | -20 to -15°F | 61 km |
| 82732 | 5a | -20 to -15°F | 69 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 USW00094023, at 44.3394, -105.5419, elevation 1327 m (4,354 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 179.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Gillette 4se (11 km)
- Echeta 2 NW (33 km)
- Weston 1 E (39 km)
- Dillinger (43 km)
- Moorcroft 3s (51 km)
- Wright 12w (68 km)
- Devils Twr #2 (71 km)
- Clearmont 5 SW (77 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.