Frost dates for Amber Lake, AK
At Amber Lake, the median last spring frost (32°F) is May 28 and the median first fall frost is Sep 13, for a typical growing season of 107 days. For a 90% chance that the last frost has passed, wait until Jun 9. Nearby ZIP codes are in USDA hardiness zones 3b to 5a.
- May 28Last spring frost (median)50% chance of 32°F after this date
- Jun 9Safer planting date10% chance of 32°F after this date
- Sep 13First fall frost (median)50% chance of 32°F by this date
- 107 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 28 | Jun 9 | Jul 5 |
| 32°F | May 14 | May 28 | Jun 9 |
| 28°F | Apr 30 | May 13 | May 28 |
| 24°F | Apr 16 | Apr 30 | May 13 |
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 16 | Sep 2 | Sep 14 |
| 32°F | Aug 30 | Sep 13 | Sep 27 |
| 28°F | Sep 11 | Sep 26 | Oct 10 |
| 24°F | Sep 24 | Oct 6 | Oct 22 |
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 | 53 days | 81 days | 100 days |
| 32°F | 87 days | 107 days | 127 days |
| 28°F | 113 days | 133 days | 153 days |
| 24°F | 141 days | 159 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 |
|---|---|---|---|
| 99683 | 4b | -25 to -20°F | 25 km |
| 99688 | 3b | -35 to -30°F | 57 km |
| 99676 | 4b | -25 to -20°F | 63 km |
| 99694 | 4a | -30 to -25°F | 73 km |
| 99652 | 4a | -30 to -25°F | 80 km |
| 99654 | 5a | -20 to -15°F | 86 km |
| 99623 | 4b | -25 to -20°F | 89 km |
| 99667 | 4b | -25 to -20°F | 102 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 USC00500247, at 62.1925, -150.5033, elevation 137 m (449 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 210.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Talkeetna Airport (25 km)
- Skwentna (44 km)
- Willow West (55 km)
- Whites Crossing (60 km)
- Chulitna River (77 km)
- Hayes River (85 km)
- Little Su At Hatcher Pass Brg (85 km)
- Anderson Lake (88 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.