Alaska climate zones
Alaska’s 30 counties fall in 4 IECC 2021 climate zones: 5C (3), 6A (7), 7 (10), 8 (7).
No zone on file
Ketchikan Gateway Borough (Cold) · Prince of Wales-Hyder Census Area (Cold) · Sitka City and Borough (Cold)
Zone 6A: cold-humid
Attic target R60 (ENERGY STAR)Haines Borough (Cold) · Hoonah-Angoon Census Area (Cold) · Juneau City and Borough (Cold) · Kodiak Island Borough (Cold) · Petersburg Borough (Cold) · Skagway Municipality (Cold) · Wrangell City and Borough (Cold)
Zone 7: very cold
Attic target R60 (ENERGY STAR)Aleutians East Borough (Very cold) · Aleutians West Census Area (Very cold) · Anchorage Municipality (Very cold) · Bethel Census Area (Very cold) · Bristol Bay Borough (Very cold) · Dillingham Census Area (Very cold) · Kenai Peninsula Borough (Very cold) · Lake and Peninsula Borough (Very cold) · Matanuska-Susitna Borough (Very cold) · Yakutat City and Borough (Very cold)
Zone 8: subarctic
Attic target R60 (ENERGY STAR)Denali Borough (Very cold) · Fairbanks North Star Borough (Subarctic) · Nome Census Area (Subarctic) · North Slope Borough (Subarctic) · Northwest Arctic Borough (Subarctic) · Southeast Fairbanks Census Area (Subarctic) · Yukon-Koyukuk Census Area (Subarctic)
No zone on file
Chugach Census Area · Copper River Census Area · Kusilvak Census Area