Alaska · NOAA station USC00501987
Frost dates for Circle Hot Springs, AK
Circle Hot Springs can freeze in any month: NOAA flags it as having a year-round risk of 32°F, too cold to compute spring and fall frost dates. The median stretch between 32°F freezes is 58 days. Nearby ZIP codes are in USDA hardiness zones 1a to 3b.
- 100%Chance of 32°F in a year
- 58 daysMedian freeze-free stretch
- 263Days at or below 32°Faverage per year
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 |
|---|---|---|---|
| 99733 | 1a | -60 to -55°F | 39 km |
| 99730 | 3b | -35 to -30°F | 48 km |
| 99712 | 3b | -35 to -30°F | 77 km |
| 99707 | 3b | -35 to -30°F | 84 km |
| 99738 | 2b | -45 to -40°F | 100 km |
| 99788 | 1a | -60 to -55°F | 134 km |
| 99724 | 1a | -60 to -55°F | 134 km |
| 99702 | 2a | -50 to -45°F | 146 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 USC00501987, at 65.4939, -144.6422, elevation 262 m (860 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 263.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Central #2 (10 km)
- Mile 42 Steese (121 km)
- Two Rivers (129 km)
- Fort Knox Mine (137 km)
- Fairbanks 11 NE (146 km)
- Gilmore Creek (146 km)
- Eielson Field (147 km)
- N Pole (150 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.