Frost dates for Cordova N, AK
At Cordova N, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 19, for a typical growing season of 176 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zones 4b to 8a.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 176 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 | Apr 30 | May 12 | May 31 |
| 32°F | Apr 10 | Apr 24 | May 8 |
| 28°F | Mar 22 | Apr 7 | Apr 23 |
| 24°F | Mar 7 | Mar 30 | Apr 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 | Sep 21 | Oct 3 | Oct 19 |
| 32°F | Oct 4 | Oct 19 | Nov 3 |
| 28°F | Oct 14 | Oct 30 | Nov 20 |
| 24°F | Oct 23 | Nov 12 | Dec 9 |
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 | 122 days | 144 days | 163 days |
| 32°F | 154 days | 176 days | 197 days |
| 28°F | 183 days | 205 days | 231 days |
| 24°F | 202 days | 230 days | 262 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 |
|---|---|---|---|
| 99686 | 5a | -20 to -15°F | 59 km |
| 99677 | 8a | 10 to 15°F | 62 km |
| 99573 | 4b | -25 to -20°F | 113 km |
| 99574 | 5a | -20 to -15°F | 118 km |
| 99693 | 7a | 0 to 5°F | 128 km |
| 99674 | 4b | -25 to -20°F | 169 km |
| 99587 | 5b | -15 to -10°F | 176 km |
| 99566 | 4b | -25 to -20°F | 188 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 USC00502173, at 60.5561, -145.7531, elevation 8 m (25 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 117.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cordova Wastewater Plant (3 km)
- Cordova M K Smith Airport (18 km)
- Valdez WSO (72 km)
- Valdez (72 km)
- Cannery Creek (109 km)
- Tonsina (126 km)
- Main Bay (128 km)
- Wally Noerenberg Hatchery (130 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.