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Frost depth by zip code map (see map) shows that the maximum frost depth is in Alaska (100 inches), Minnesota (80 inches), and North Dakota (75 inches). However, because of the warm climate, Florida and Hawaii have frost depths equal to zero.
Frost Line Depth by Zip Code There are online tools that allow you to enter a zip code to discover what the frost depth might be where you’re building. Once again, don’t take this information as gospel.
Before digging footings for your deck or for placing water pipes check your frost line by zip code and location to determine how deep you can go.
The custom map below depicts the United States residential building code frost depth by jurisdiction based on our research. The information presented in this map is the most comprehensive database of building code frost depths on the internet, covering about 60% of the US residential population.
Discover the factors influencing frost line depth, the importance of knowing it for your foundation, and how to determine it based on your zip code’s variability. Factors Affecting Frost Line Depth Climate
Historical frost depth data (2004-2023): click here to download zipped .csv. For year-to-date data, please contact the NCRFC directly. Metadata for the historical frost depth data: click here to open metadata.txt in a new tab. Frost depth data for the past seven days: click here to download .csv.
For accurate, up-to-date information about the current frost level in your area, the National Weather Service provides a country-wide frost line depths map that can be referenced by...
Explore the latest frost depth data and measurements from the National Weather Service River Forecast Center on ArcGIS Dashboards.
Frost Line Map by Zip Code. If the map isn’t accurate enough for you. It will give you a general idea of where frost lines are at your location for the time of the year. Check your frost line by zip code or address using this NCREC map from the National Weather Service.
The frost line map below was drawn based on data from the U.S Department of Commerce. Keep in mind you local building official will be able to provide the most accurate information based on your particular area.