Climate zones by state

Florida Climate Zones by County

Florida's 67 counties span climate zones 1A to 2A under the 2021 International Energy Conservation Code (IECC). Zone 2A is the most common, with 63 of the 67. For reference, Miami is in zone 1A and Tampa, Orlando and Jacksonville are in 2A.

Insulation minimums for each zone in Florida

ZoneCountiesAtticWood-frame wallsFloors over unheated spaceBasement walls
1A4R-30R-13, or R-10ciR-13None required
2A63R-49R-13, or R-10ciR-13None required

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 Florida uses

Florida enforces the 2021 IECC with amendments for homes (in effect since Dec 2023). 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

One county moved one zone warmer in the 2021 map: Palm Beach County (2 → 1). If your town still enforces the 2018 or 2015 code, the older zone applies to permits.

Every county in Florida

NameZone (2021)Zone (2018)Details
Alachua County2A2AInsulation →
Baker County2A2AInsulation →
Bay County2A2AInsulation →
Bradford County2A2AInsulation →
Brevard County2A2AInsulation →
Broward County1A1AInsulation →
Calhoun County2A2AInsulation →
Charlotte County2A2AInsulation →
Citrus County2A2AInsulation →
Clay County2A2AInsulation →
Collier County2A2AInsulation →
Columbia County2A2AInsulation →
DeSoto County2A2AInsulation →
Dixie County2A2AInsulation →
Duval County2A2AInsulation →
Escambia County2A2AInsulation →
Flagler County2A2AInsulation →
Franklin County2A2AInsulation →
Gadsden County2A2AInsulation →
Gilchrist County2A2AInsulation →
Glades County2A2AInsulation →
Gulf County2A2AInsulation →
Hamilton County2A2AInsulation →
Hardee County2A2AInsulation →
Hendry County2A2AInsulation →
Hernando County2A2AInsulation →
Highlands County2A2AInsulation →
Hillsborough County2A2AInsulation →
Holmes County2A2AInsulation →
Indian River County2A2AInsulation →
Jackson County2A2AInsulation →
Jefferson County2A2AInsulation →
Lafayette County2A2AInsulation →
Lake County2A2AInsulation →
Lee County2A2AInsulation →
Leon County2A2AInsulation →
Levy County2A2AInsulation →
Liberty County2A2AInsulation →
Madison County2A2AInsulation →
Manatee County2A2AInsulation →
Marion County2A2AInsulation →
Martin County2A2AInsulation →
Miami-Dade County1A1AInsulation →
Monroe County1A1AInsulation →
Nassau County2A2AInsulation →
Okaloosa County2A2AInsulation →
Okeechobee County2A2AInsulation →
Orange County2A2AInsulation →
Osceola County2A2AInsulation →
Palm Beach County1A2A changedInsulation →
Pasco County2A2AInsulation →
Pinellas County2A2AInsulation →
Polk County2A2AInsulation →
Putnam County2A2AInsulation →
Santa Rosa County2A2AInsulation →
Sarasota County2A2AInsulation →
Seminole County2A2AInsulation →
St. Johns County2A2AInsulation →
St. Lucie County2A2AInsulation →
Sumter County2A2AInsulation →
Suwannee County2A2AInsulation →
Taylor County2A2AInsulation →
Union County2A2AInsulation →
Volusia County2A2AInsulation →
Wakulla County2A2AInsulation →
Walton County2A2AInsulation →
Washington County2A2AInsulation →

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 Florida?

Florida spans IECC climate zones 1A to 2A; zone 2A is the most common. Find your county in the table above, or search by ZIP code.

How much attic insulation do I need in Florida?

In Florida, the 2021 IECC calls for R-30 and R-49 in the attic, depending on the zone. The table near the top of this page lists each zone's minimums.

What energy code does Florida use?

Florida enforces the 2021 IECC with amendments for homes (in effect since Dec 2023). Source: US Department of Energy, September 2026. Local governments can adopt newer codes or amendments.

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