Frost dates for Cold Bay Airport, AK
At Cold Bay Airport, the median last spring frost (32°F) is May 25 and the median first fall frost is Oct 4, for a typical growing season of 131 days. For a 90% chance that the last frost has passed, wait until Jun 10. Nearby ZIP codes are in USDA hardiness zone 7a.
- May 25Last spring frost (median)50% chance of 32°F after this date
- Jun 10Safer planting date10% chance of 32°F after this date
- Oct 4First fall frost (median)50% chance of 32°F by this date
- 131 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 23 | Jun 7 | Jun 25 |
| 32°F | May 9 | May 25 | Jun 10 |
| 28°F | Apr 23 | May 8 | May 27 |
| 24°F | Apr 6 | Apr 24 | 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 |
|---|---|---|---|
| 36°F | Aug 23 | Sep 20 | Oct 4 |
| 32°F | Sep 20 | Oct 4 | Oct 20 |
| 28°F | Oct 4 | Oct 21 | Nov 6 |
| 24°F | Oct 21 | Nov 7 | Nov 27 |
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 | 70 days | 100 days | 122 days |
| 32°F | 109 days | 131 days | 154 days |
| 28°F | 140 days | 165 days | 189 days |
| 24°F | 174 days | 199 days | 223 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 |
|---|---|---|---|
| 99571 | 7a | 0 to 5°F | 7 km |
| 99612 | 7a | 0 to 5°F | 30 km |
| 99583 | 7a | 0 to 5°F | 57 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 USW00025624, at 55.2208, -162.7325, elevation 24 m (78 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 148.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sand Point 1 ENE (144 km)
- Dutch Harbor (286 km)
- St. George Island Airport (452 km)
- St. Paul 4 NE (510 km)
- St. Paul Island Airport (511 km)
- King Salmon 42 SE (532 km)
- King Salmon (533 km)
- Bethel Airport (621 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.