Frost dates for Central #2, AK
At Central #2, the median last spring frost (32°F) is May 25 and the median first fall frost is Aug 26, for a typical growing season of 92 days. For a 90% chance that the last frost has passed, wait until Jun 6. Nearby ZIP codes are in USDA hardiness zones 1a to 3b.
- May 25Last spring frost (median)50% chance of 32°F after this date
- Jun 6Safer planting date10% chance of 32°F after this date
- Aug 26First fall frost (median)50% chance of 32°F by this date
- 92 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 12 | May 25 | Jun 6 |
| 28°F | May 5 | May 14 | May 28 |
| 24°F | Apr 29 | May 7 | May 20 |
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 | Aug 12 | Aug 26 | Sep 7 |
| 28°F | Aug 23 | Sep 5 | Sep 18 |
| 24°F | Sep 2 | Sep 16 | Sep 28 |
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 | 40 days | 66 days | 86 days |
| 32°F | 70 days | 92 days | 109 days |
| 28°F | 94 days | 113 days | 129 days |
| 24°F | 112 days | 131 days | 147 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 99733 | 1a | -60 to -55°F | 36 km |
| 99730 | 3b | -35 to -30°F | 40 km |
| 99788 | 1a | -60 to -55°F | 128 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 USC00501466, at 65.5667, -144.7653, elevation 280 m (920 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 254.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Circle Hot Springs (10 km)
- Mile 42 Steese (118 km)
- Two Rivers (128 km)
- Fort Knox Mine (135 km)
- Fairbanks 11 NE (144 km)
- Gilmore Creek (144 km)
- Eielson Field (148 km)
- Fox 2 SE (149 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.