Frost dates for St. George Island Airport, AK
At St. George Island Airport, the median last spring frost (32°F) is May 31 and the median first fall frost is Oct 5, for a typical growing season of 128 days. For a 90% chance that the last frost has passed, wait until Jun 23. Nearby ZIP codes are in USDA hardiness zones 7a to 8b.
- May 31Last spring frost (median)50% chance of 32°F after this date
- Jun 23Safer planting date10% chance of 32°F after this date
- Oct 5First fall frost (median)50% chance of 32°F by this date
- 128 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 10 | May 31 | Jun 23 |
| 28°F | Apr 24 | May 9 | May 29 |
| 24°F | Apr 6 | Apr 25 | May 11 |
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 | Sep 17 | Oct 5 | Oct 21 |
| 28°F | Oct 5 | Oct 24 | Nov 12 |
| 24°F | Oct 24 | Nov 13 | Dec 4 |
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 | 57 days | 89 days | 116 days |
| 32°F | 100 days | 128 days | 153 days |
| 28°F | 138 days | 166 days | 192 days |
| 24°F | 174 days | 199 days | 228 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 |
|---|---|---|---|
| 99591 | 7a | 0 to 5°F | 7 km |
| 99546 | 8b | 15 to 20°F | 700 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 USW00025628, at 56.6000, -169.5650, elevation 38 m (125 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 162.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- St. Paul 4 NE (73 km)
- St. Paul Island Airport (74 km)
- Dutch Harbor (357 km)
- Cold Bay Airport (452 km)
- Sand Point 1 ENE (583 km)
- Bethel Airport (644 km)
- King Salmon (802 km)
- King Salmon 42 SE (835 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.