Frost dates for Eagle River 5 SE, AK
At Eagle River 5 SE, the median last spring frost (32°F) is May 21 and the median first fall frost is Sep 15, for a typical growing season of 116 days. For a 90% chance that the last frost has passed, wait until Jun 3. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 21Last spring frost (median)50% chance of 32°F after this date
- Jun 3Safer planting date10% chance of 32°F after this date
- Sep 15First fall frost (median)50% chance of 32°F by this date
- 116 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 4 | Jun 20 |
| 32°F | May 8 | May 21 | Jun 3 |
| 28°F | Apr 22 | May 5 | May 19 |
| 24°F | Apr 8 | Apr 21 | May 4 |
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 18 | Sep 2 | Sep 16 |
| 32°F | Aug 31 | Sep 15 | Sep 27 |
| 28°F | Sep 10 | Sep 26 | Oct 10 |
| 24°F | Sep 23 | Oct 6 | Oct 21 |
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 | 67 days | 89 days | 107 days |
| 32°F | 96 days | 116 days | 135 days |
| 28°F | 122 days | 143 days | 164 days |
| 24°F | 149 days | 168 days | 187 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 |
|---|---|---|---|
| 99505 | 5a | -20 to -15°F | 11 km |
| 99504 | 5a | -20 to -15°F | 15 km |
| 99577 | 5a | -20 to -15°F | 16 km |
| 99506 | 5a | -20 to -15°F | 20 km |
| 99507 | 5a | -20 to -15°F | 22 km |
| 99567 | 5a | -20 to -15°F | 22 km |
| 99508 | 5a | -20 to -15°F | 23 km |
| 99501 | 5a | -20 to -15°F | 24 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 USC00502656, at 61.2967, -149.4400, elevation 152 m (498 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 205.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Eagle River Gakona Circle (6 km)
- Eagle River Nature Center (11 km)
- Fort Richardson Water Plant (14 km)
- Eklutna Water Plant (18 km)
- Campbell Creek Sci Center (23 km)
- Anchorage Merrill Field (24 km)
- Glen Alps (26 km)
- Anchorage Upper De Armoun (26 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.