North Carolina climate zones
North Carolina’s 100 counties fall in 3 IECC 2021 climate zones: 3A (79), 4A (16), 5A (5).
Zone 3A: warm-humid
Attic target R49 (ENERGY STAR)Alamance County (Mixed-humid) · Alexander County (Mixed-humid) · Anson County (Mixed-humid) · Beaufort County (Mixed-humid) · Bertie County (Mixed-humid) · Bladen County (Mixed-humid) · Brunswick County (Hot-humid) · Cabarrus County (Mixed-humid) · Camden County (Mixed-humid) · Carteret County (Hot-humid) · Caswell County (Mixed-humid) · Catawba County (Mixed-humid) · Chatham County (Mixed-humid) · Cherokee County (Mixed-humid) · Chowan County (Mixed-humid) · Clay County (Mixed-humid) · Cleveland County (Mixed-humid) · Columbus County (Hot-humid) · Craven County (Mixed-humid) · Cumberland County (Mixed-humid) · Currituck County (Mixed-humid) · Dare County (Mixed-humid) · Davidson County (Mixed-humid) · Davie County (Mixed-humid) · Duplin County (Mixed-humid) · Durham County (Mixed-humid) · Edgecombe County (Mixed-humid) · Forsyth County (Mixed-humid) · Franklin County (Mixed-humid) · Gaston County (Mixed-humid) · Gates County (Mixed-humid) · Granville County (Mixed-humid) · Greene County (Mixed-humid) · Guilford County (Mixed-humid) · Halifax County (Mixed-humid) · Harnett County (Mixed-humid) · Hertford County (Mixed-humid) · Hoke County (Mixed-humid) · Hyde County (Mixed-humid) · Iredell County (Mixed-humid) · Johnston County (Mixed-humid) · Jones County (Mixed-humid) · Lee County (Mixed-humid) · Lenoir County (Mixed-humid) · Lincoln County (Mixed-humid) · Martin County (Mixed-humid) · Mecklenburg County (Mixed-humid) · Montgomery County (Mixed-humid) · Moore County (Mixed-humid) · Nash County (Mixed-humid) · New Hanover County (Hot-humid) · Northampton County (Mixed-humid) · Onslow County (Hot-humid) · Orange County (Mixed-humid) · Pamlico County (Mixed-humid) · Pasquotank County (Mixed-humid) · Pender County (Hot-humid) · Perquimans County (Mixed-humid) · Person County (Mixed-humid) · Pitt County (Mixed-humid) · Polk County (Mixed-humid) · Randolph County (Mixed-humid) · Richmond County (Mixed-humid) · Robeson County (Mixed-humid) · Rockingham County (Mixed-humid) · Rowan County (Mixed-humid) · Rutherford County (Mixed-humid) · Sampson County (Mixed-humid) · Scotland County (Mixed-humid) · Stanly County (Mixed-humid) · Tyrrell County (Mixed-humid) · Union County (Mixed-humid) · Vance County (Mixed-humid) · Wake County (Mixed-humid) · Warren County (Mixed-humid) · Washington County (Mixed-humid) · Wayne County (Mixed-humid) · Wilkes County (Mixed-humid) · Wilson County (Mixed-humid)
Zone 4A: mixed-humid
Attic target R60 (ENERGY STAR)Buncombe County (Mixed-humid) · Burke County (Mixed-humid) · Caldwell County (Mixed-humid) · Graham County (Mixed-humid) · Haywood County (Mixed-humid) · Henderson County (Mixed-humid) · Jackson County (Mixed-humid) · Macon County (Mixed-humid) · Madison County (Mixed-humid) · McDowell County (Mixed-humid) · Mitchell County (Mixed-humid) · Stokes County (Mixed-humid) · Surry County (Mixed-humid) · Swain County (Mixed-humid) · Transylvania County (Mixed-humid) · Yadkin County (Mixed-humid)
Zone 5A: cool-humid
Attic target R60 (ENERGY STAR)Alleghany County (Cold) · Ashe County (Cold) · Avery County (Cold) · Watauga County (Cold) · Yancey County (Cold)