About Frostline.info

Frostline.info gives homeowners, deck builders, fence installers and contractors a quick frost-depth estimate for any US ZIP code, so they can plan footings and buried lines before calling the permit office.

The numbers come from public NOAA climate records and standard frost-engineering formulas. See the methodology for details.

Questions or corrections: hello@frostline.info. If your building department publishes a frost depth that differs from our range, tell us and we will add it.