Frost dates for Rochelle 7ene, WY
At Rochelle 7ene, the median last spring frost (32°F) is May 25 and the median first fall frost is Sep 14, for a typical growing season of 110 days. For a 90% chance that the last frost has passed, wait until Jun 11. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 25Last spring frost (median)50% chance of 32°F after this date
- Jun 11Safer planting date10% chance of 32°F after this date
- Sep 14First fall frost (median)50% chance of 32°F by this date
- 110 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 24 | Jun 7 | Jun 28 |
| 32°F | May 11 | May 25 | Jun 11 |
| 28°F | May 1 | May 13 | May 29 |
| 24°F | Apr 20 | May 4 | May 16 |
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 19 | Sep 5 | Sep 17 |
| 32°F | Aug 31 | Sep 14 | Sep 27 |
| 28°F | Sep 10 | Sep 24 | Oct 6 |
| 24°F | Sep 18 | Oct 3 | Oct 16 |
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 | 62 days | 87 days | 108 days |
| 32°F | 88 days | 110 days | 128 days |
| 28°F | 112 days | 131 days | 148 days |
| 24°F | 133 days | 150 days | 168 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 |
|---|---|---|---|
| 82701 | 4b | -25 to -20°F | 31 km |
| 82730 | 4b | -25 to -20°F | 46 km |
| 82723 | 4b | -25 to -20°F | 51 km |
| 82222 | 4b | -25 to -20°F | 55 km |
| 82732 | 5a | -20 to -15°F | 60 km |
| 82718 | 5a | -20 to -15°F | 69 km |
| 82727 | 4b | -25 to -20°F | 82 km |
| 82633 | 5a | -20 to -15°F | 82 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 USC00487810, at 43.6450, -104.8414, elevation 1292 m (4,239 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 204.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Dull Center 1se (28 km)
- Upton (53 km)
- Lance Creek 11nne (55 km)
- Dillinger (55 km)
- Newcastle (57 km)
- Redbird (63 km)
- Moorcroft 3s (64 km)
- Wright 12w (73 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.