Climate zones by state

Nebraska Climate Zones by County

All 93 of Nebraska's counties are in climate zone 5A under the 2021 International Energy Conservation Code (IECC).

Insulation minimums in Nebraska (zone 5A)

ZoneAtticWood-frame wallsFloors over unheated spaceBasement walls
5AR-60R-30, or 20+5ci, or 13+10ci, or R-20ciR-30R-15ci, or R-19, or 13+5ci

Minimums from the 2021 IECC (Table R402.1.3). Many areas still enforce an older edition, so check with your local building department. See sources.

Which energy code Nebraska uses

Nebraska enforces the 2018 IECC for homes (in effect since Jul 2020). Source: US Department of Energy, September 2026. Local governments can adopt newer codes or amendments. See every state's energy code.

What changed from the 2018 map

None of Nebraska's counties changed zone between the 2018 and 2021 maps.

Every county in Nebraska

NameZone (2021)Zone (2018)Details
Adams County5A5AInsulation →
Antelope County5A5AInsulation →
Arthur County5A5AInsulation →
Banner County5A5AInsulation →
Blaine County5A5AInsulation →
Boone County5A5AInsulation →
Box Butte County5A5AInsulation →
Boyd County5A5AInsulation →
Brown County5A5AInsulation →
Buffalo County5A5AInsulation →
Burt County5A5AInsulation →
Butler County5A5AInsulation →
Cass County5A5AInsulation →
Cedar County5A5AInsulation →
Chase County5A5AInsulation →
Cherry County5A5AInsulation →
Cheyenne County5A5AInsulation →
Clay County5A5AInsulation →
Colfax County5A5AInsulation →
Cuming County5A5AInsulation →
Custer County5A5AInsulation →
Dakota County5A5AInsulation →
Dawes County5A5AInsulation →
Dawson County5A5AInsulation →
Deuel County5A5AInsulation →
Dixon County5A5AInsulation →
Dodge County5A5AInsulation →
Douglas County5A5AInsulation →
Dundy County5A5AInsulation →
Fillmore County5A5AInsulation →
Franklin County5A5AInsulation →
Frontier County5A5AInsulation →
Furnas County5A5AInsulation →
Gage County5A5AInsulation →
Garden County5A5AInsulation →
Garfield County5A5AInsulation →
Gosper County5A5AInsulation →
Grant County5A5AInsulation →
Greeley County5A5AInsulation →
Hall County5A5AInsulation →
Hamilton County5A5AInsulation →
Harlan County5A5AInsulation →
Hayes County5A5AInsulation →
Hitchcock County5A5AInsulation →
Holt County5A5AInsulation →
Hooker County5A5AInsulation →
Howard County5A5AInsulation →
Jefferson County5A5AInsulation →
Johnson County5A5AInsulation →
Kearney County5A5AInsulation →
Keith County5A5AInsulation →
Keya Paha County5A5AInsulation →
Kimball County5A5AInsulation →
Knox County5A5AInsulation →
Lancaster County5A5AInsulation →
Lincoln County5A5AInsulation →
Logan County5A5AInsulation →
Loup County5A5AInsulation →
Madison County5A5AInsulation →
McPherson County5A5AInsulation →
Merrick County5A5AInsulation →
Morrill County5A5AInsulation →
Nance County5A5AInsulation →
Nemaha County5A5AInsulation →
Nuckolls County5A5AInsulation →
Otoe County5A5AInsulation →
Pawnee County5A5AInsulation →
Perkins County5A5AInsulation →
Phelps County5A5AInsulation →
Pierce County5A5AInsulation →
Platte County5A5AInsulation →
Polk County5A5AInsulation →
Red Willow County5A5AInsulation →
Richardson County5A5AInsulation →
Rock County5A5AInsulation →
Saline County5A5AInsulation →
Sarpy County5A5AInsulation →
Saunders County5A5AInsulation →
Scotts Bluff County5A5AInsulation →
Seward County5A5AInsulation →
Sheridan County5A5AInsulation →
Sherman County5A5AInsulation →
Sioux County5A5AInsulation →
Stanton County5A5AInsulation →
Thayer County5A5AInsulation →
Thomas County5A5AInsulation →
Thurston County5A5AInsulation →
Valley County5A5AInsulation →
Washington County5A5AInsulation →
Wayne County5A5AInsulation →
Webster County5A5AInsulation →
Wheeler County5A5AInsulation →
York County5A5AInsulation →

Source: Pacific Northwest National Laboratory, Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (2022).

Frequently asked questions

What climate zone is Nebraska?

Nebraska is IECC climate zone 5A under the 2021 code.

How much attic insulation do I need in Nebraska?

The 2021 IECC calls for R-60 in the attic everywhere in Nebraska.

What energy code does Nebraska use?

Nebraska enforces the 2018 IECC for homes (in effect since Jul 2020). Source: US Department of Energy, September 2026. Local governments can adopt newer codes or amendments.

More for Nebraska: Last frost dates in Nebraska · Nebraska planting zones · Frost line depth by state