Deconstruct SunAlaska Hardiness Zones
Alaska covers USDA plant hardiness zones 1a to 8b on the 2023 map, so its coldest areas average −60 to −55 °F on the coldest winter night. Find your zone by ZIP code, or pick a city below for its zone, sunrise and daylight by month.
Alaska hardiness zone map
This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km. Dots mark cities with their own page.
Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30.
Zones and daylight by city
| City | Zone | Coldest night | Longest day | Shortest day |
|---|---|---|---|---|
| Anchorage | 5b | −15 to −10 °F | 19h 22m | 5h 27m |
| Fairbanks | 2a | −50 to −45 °F | 21h 50m | 3h 42m |
| Juneau | 7a | 0 to 5 °F | 18h 17m | 6h 22m |
Gardening in Alaska?
Your zone says what survives winter. Deconstruct Sun measures how many hours of direct sun your exact spot gets, so you can pick plants that thrive. Free on iPhone.
Questions
What hardiness zones are in Alaska?
Alaska spans USDA zones 1a to 8b on the 2023 map. Among its larger cities, Fairbanks is coldest (zone 2a) and Juneau is warmest (zone 7a).
How do I find my exact zone in Alaska?
Enter your ZIP code in the hardiness zone lookup on this site. It reads the 2023 USDA data for that ZIP and warns you if you are near a zone boundary.
How much sun do gardens in Alaska get?
In Anchorage, an open spot gets up to 19.4 hours of daylight in June but only 5.5 in December. Trees and buildings cut that down, especially in winter. The Deconstruct Sun app measures the real direct-sun hours for one exact spot.