Frost dates for King Salmon, AK
At King Salmon, the median last spring frost (32°F) is May 26 and the median first fall frost is Sep 15, for a typical growing season of 111 days. For a 90% chance that the last frost has passed, wait until Jun 11. Nearby ZIP codes are in USDA hardiness zones 4a to 5a.
- May 26Last spring frost (median)50% chance of 32°F after this date
- Jun 11Safer planting date10% chance of 32°F after this date
- Sep 15First fall frost (median)50% chance of 32°F by this date
- 111 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 31 | Jun 14 | Jul 4 |
| 32°F | May 9 | May 26 | Jun 11 |
| 28°F | Apr 23 | May 8 | May 25 |
| 24°F | Apr 11 | Apr 26 | 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 16 | Sep 1 | Sep 16 |
| 32°F | Aug 31 | Sep 15 | Sep 29 |
| 28°F | Sep 11 | Sep 27 | Oct 10 |
| 24°F | Sep 23 | Oct 5 | 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 | 53 days | 77 days | 98 days |
| 32°F | 89 days | 111 days | 133 days |
| 28°F | 121 days | 142 days | 162 days |
| 24°F | 144 days | 163 days | 185 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 |
|---|---|---|---|
| 99633 | 4b | -25 to -20°F | 19 km |
| 99670 | 4b | -25 to -20°F | 21 km |
| 99625 | 4b | -25 to -20°F | 46 km |
| 99579 | 5a | -20 to -15°F | 70 km |
| 99580 | 4b | -25 to -20°F | 89 km |
| 99636 | 4b | -25 to -20°F | 98 km |
| 99569 | 4b | -25 to -20°F | 110 km |
| 99628 | 4b | -25 to -20°F | 132 km |
| 99555 | 4b | -25 to -20°F | 135 km |
| 99576 | 4a | -30 to -25°F | 147 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 USW00025503, at 58.6794, -156.6294, elevation 19 m (63 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 192.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- King Salmon 42 SE (67 km)
- Iliamna Airport (154 km)
- Intricate Bay (156 km)
- Port Alsworth 1 SW (213 km)
- Port Alsworth (214 km)
- Kitoi Bay (254 km)
- Ouzinkie (255 km)
- Monashka Creek Dam (261 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.