Indiana climate zones
Indiana’s 92 counties fall in 2 IECC 2021 climate zones: 4A (45), 5A (47).
Zone 4A: mixed-humid
Attic target R60 (ENERGY STAR)Bartholomew County (Mixed-humid) · Brown County (Mixed-humid) · Clark County (Mixed-humid) · Clay County (Mixed-humid) · Crawford County (Mixed-humid) · Daviess County (Mixed-humid) · Dearborn County (Mixed-humid) · Decatur County (Mixed-humid) · Dubois County (Mixed-humid) · Fayette County (Mixed-humid) · Floyd County (Mixed-humid) · Franklin County (Mixed-humid) · Gibson County (Mixed-humid) · Greene County (Mixed-humid) · Harrison County (Mixed-humid) · Hendricks County (Mixed-humid) · Jackson County (Mixed-humid) · Jefferson County (Mixed-humid) · Jennings County (Mixed-humid) · Johnson County (Mixed-humid) · Knox County (Mixed-humid) · Lawrence County (Mixed-humid) · Marion County (Mixed-humid) · Martin County (Mixed-humid) · Monroe County (Mixed-humid) · Morgan County (Mixed-humid) · Ohio County (Mixed-humid) · Orange County (Mixed-humid) · Owen County (Mixed-humid) · Perry County (Mixed-humid) · Pike County (Mixed-humid) · Posey County (Mixed-humid) · Putnam County (Mixed-humid) · Ripley County (Mixed-humid) · Rush County (Mixed-humid) · Scott County (Mixed-humid) · Shelby County (Mixed-humid) · Spencer County (Mixed-humid) · Sullivan County (Mixed-humid) · Switzerland County (Mixed-humid) · Union County (Mixed-humid) · Vanderburgh County (Mixed-humid) · Vigo County (Mixed-humid) · Warrick County (Mixed-humid) · Washington County (Mixed-humid)
Zone 5A: cool-humid
Attic target R60 (ENERGY STAR)Adams County (Cold) · Allen County (Cold) · Benton County (Cold) · Blackford County (Cold) · Boone County (Cold) · Carroll County (Cold) · Cass County (Cold) · Clinton County (Cold) · DeKalb County (Cold) · Delaware County (Cold) · Elkhart County (Cold) · Fountain County (Cold) · Fulton County (Cold) · Grant County (Cold) · Hamilton County (Cold) · Hancock County (Cold) · Henry County (Cold) · Howard County (Cold) · Huntington County (Cold) · Jasper County (Cold) · Jay County (Cold) · Kosciusko County (Cold) · LaGrange County (Cold) · Lake County (Cold) · LaPorte County (Cold) · Madison County (Cold) · Marshall County (Cold) · Miami County (Cold) · Montgomery County (Cold) · Newton County (Cold) · Noble County (Cold) · Parke County (Cold) · Porter County (Cold) · Pulaski County (Cold) · Randolph County (Cold) · St. Joseph County (Cold) · Starke County (Cold) · Steuben County (Cold) · Tippecanoe County (Cold) · Tipton County (Cold) · Vermillion County (Cold) · Wabash County (Cold) · Warren County (Cold) · Wayne County (Cold) · Wells County (Cold) · White County (Cold) · Whitley County (Cold)