Map of the eight IECC climate zones across the United States

The IECC divides the country into eight climate zones, warm zone 1 in the south to cold zone 8 in the north. Look up your zone below — the colder it is, the more insulation the code requires.

A simplified map of the United States colored by IECC climate zone, from warm zone 1 in the south (red) through mixed zone 4 in the middle to cold zone 8 in the far north (navy). Florida and the Gulf coast fall in the hot zones 1 and 2; the deep South in warm zone 3; the middle of the country in mixed zone 4 and cool zone 5; and the northern tier, including Minnesota and Maine, in the cold zones 6 and 7. Alaska (zones 7 and 8) and Hawaii (zone 1) are shown as insets at the lower left. A legend names each zone’s climate. The colder the zone (the higher the number), the more insulation the energy code requires, so finding your zone is the first step. — Source: 2021 IECC Figure R301.1 / Table R301.1

Use this diagram free on your site — grab the embed codeGet the code

What this diagram shows

A simplified map of the United States colored by IECC climate zone, from warm zone 1 in the south (red) through mixed zone 4 in the middle to cold zone 8 in the far north (navy). Florida and the Gulf coast fall in the hot zones 1 and 2; the deep South in warm zone 3; the middle of the country in mixed zone 4 and cool zone 5; and the northern tier, including Minnesota and Maine, in the cold zones 6 and 7. Alaska (zones 7 and 8) and Hawaii (zone 1) are shown as insets at the lower left. A legend names each zone’s climate. The colder the zone (the higher the number), the more insulation the energy code requires, so finding your zone is the first step.

Use this diagram — free

You're welcome to use this diagram on your own site, blog, handout, or lesson at no cost. The only condition is a visible credit link back to the source page. Copy the snippet below and paste it into your page — the credit is already included.

Embed code (HTML)

<figure style="margin:0;max-width:800px">
  <a href="https://remodelcalculators.com/construction-diagrams/climate-zone-us-map" target="_blank" rel="noopener">
    <img src="https://remodelcalculators.com/api/figure-embed/climate-zone-us-map" alt="A simplified map of the United States colored by IECC climate zone, from warm zone 1 in the south (red) through mixed zone 4 in the middle to cold zone 8 in the far north (navy). Florida and the Gulf coast fall in the hot zones 1 and 2; the deep South in warm zone 3; the middle of the country in mixed zone 4 and cool zone 5; and the northern tier, including Minnesota and Maine, in the cold zones 6 and 7. Alaska (zones 7 and 8) and Hawaii (zone 1) are shown as insets at the lower left. A legend names each zone’s climate. The colder the zone (the higher the number), the more insulation the energy code requires, so finding your zone is the first step." width="800" height="600" style="width:100%;height:auto;border:0" loading="lazy">
  </a>
  <figcaption style="font:14px/1.4 -apple-system,sans-serif;margin-top:6px;color:#555">
    Diagram: <a href="https://remodelcalculators.com/construction-diagrams/climate-zone-us-map" target="_blank" rel="noopener">Map of the eight IECC climate zones across the United States</a> — courtesy of <a href="https://remodelcalculators.com" target="_blank" rel="noopener">RemodelCalculators.com</a>
  </figcaption>
</figure>

Please keep the credit link intact and don't alter the diagram itself. Redistribution as part of a competing diagram library or template pack isn't permitted. Questions? Reach us via the site.

Was this diagram helpful?