IECC 2021 · PNNL
Wyoming climate zones
Wyoming’s 23 counties fall in 3 IECC 2021 climate zones: 5B (3), 6B (17), 7 (3).
Zone 5B: cool-dry
Attic target R60 (ENERGY STAR)Goshen County (Cold) · Laramie County (Cold) · Platte County (Cold)
Zone 6B: cold-dry
Attic target R60 (ENERGY STAR)Albany County (Cold) · Big Horn County (Cold) · Campbell County (Cold) · Carbon County (Cold) · Converse County (Cold) · Crook County (Cold) · Fremont County (Cold) · Hot Springs County (Cold) · Johnson County (Cold) · Natrona County (Cold) · Niobrara County (Cold) · Park County (Cold) · Sheridan County (Cold) · Sweetwater County (Cold) · Uinta County (Cold) · Washakie County (Cold) · Weston County (Cold)
Zone 7: very cold
Attic target R60 (ENERGY STAR)Lincoln County (Very cold) · Sublette County (Very cold) · Teton County (Very cold)