Frost dates for Skwentna, AK
At Skwentna, the median last spring frost (32°F) is May 23 and the median first fall frost is Sep 9, for a typical growing season of 109 days. For a 90% chance that the last frost has passed, wait until Jun 4. Nearby ZIP codes are in USDA hardiness zones 3b to 5a.
- May 23Last spring frost (median)50% chance of 32°F after this date
- Jun 4Safer planting date10% chance of 32°F after this date
- Sep 9First fall frost (median)50% chance of 32°F by this date
- 109 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 25 | Jun 5 | Jun 22 |
| 32°F | May 8 | May 23 | Jun 4 |
| 28°F | Apr 24 | May 8 | May 22 |
| 24°F | Apr 13 | Apr 25 | May 9 |
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 14 | Aug 30 | Sep 13 |
| 32°F | Aug 26 | Sep 9 | Sep 25 |
| 28°F | Sep 3 | Sep 23 | Oct 7 |
| 24°F | Sep 17 | Oct 3 | Oct 18 |
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 | 58 days | 84 days | 102 days |
| 32°F | 90 days | 109 days | 130 days |
| 28°F | 115 days | 137 days | 157 days |
| 24°F | 139 days | 160 days | 180 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 |
|---|---|---|---|
| 99667 | 4b | -25 to -20°F | 57 km |
| 99683 | 4b | -25 to -20°F | 64 km |
| 99694 | 4a | -30 to -25°F | 83 km |
| 99652 | 4a | -30 to -25°F | 83 km |
| 99688 | 3b | -35 to -30°F | 84 km |
| 99682 | 5a | -20 to -15°F | 87 km |
| 99623 | 4b | -25 to -20°F | 91 km |
| 99654 | 5a | -20 to -15°F | 103 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 USW00026514, at 61.9772, -151.2169, elevation 46 m (150 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 222.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Amber Lake (44 km)
- Hayes River (45 km)
- Willow West (66 km)
- Talkeetna Airport (70 km)
- Whites Crossing (71 km)
- Puntilla (80 km)
- Anderson Lake (106 km)
- Little Su At Hatcher Pass Brg (108 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.