Frost dates for Kodiak Wastewater Plant, AK
At Kodiak Wastewater Plant, the median last spring frost (32°F) is Apr 29 and the median first fall frost is Oct 14, for a typical growing season of 168 days. For a 90% chance that the last frost has passed, wait until May 13. Nearby ZIP codes are in USDA hardiness zones 6a to 7b.
- Apr 29Last spring frost (median)50% chance of 32°F after this date
- May 13Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 168 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 4 | May 19 | Jun 1 |
| 32°F | Apr 14 | Apr 29 | May 13 |
| 28°F | Mar 31 | Apr 11 | Apr 26 |
| 24°F | Mar 15 | Apr 2 | Apr 16 |
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 14 | Oct 1 | Oct 16 |
| 32°F | Sep 30 | Oct 14 | Oct 29 |
| 28°F | Oct 11 | Oct 26 | Nov 14 |
| 24°F | Oct 21 | Nov 7 | Dec 1 |
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 | 112 days | 135 days | 155 days |
| 32°F | 149 days | 168 days | 190 days |
| 28°F | 177 days | 197 days | 220 days |
| 24°F | 197 days | 219 days | 248 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 |
|---|---|---|---|
| 99644 | 7b | 5 to 10°F | 12 km |
| 99550 | 7a | 0 to 5°F | 30 km |
| 99615 | 7a | 0 to 5°F | 62 km |
| 99643 | 7b | 5 to 10°F | 87 km |
| 99624 | 7b | 5 to 10°F | 96 km |
| 99608 | 7a | 0 to 5°F | 122 km |
| 99663 | 6b | -5 to 0°F | 183 km |
| 99603 | 6a | -10 to -5°F | 204 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 USC00504991, at 57.8047, -152.3561, elevation 16 m (54 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 120.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Monashka Creek Dam (7 km)
- Kodiak Airport (10 km)
- Ouzinkie (16 km)
- Kitoi Bay (43 km)
- Seldovia Airport (186 km)
- Homer Airport (210 km)
- King Salmon 42 SE (215 km)
- Homer 8 NW (220 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.