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This map is from the National Snow and Ice Data center and shows the frost line map across the United States. Note how it moves down from 72-inch depth to a 6-inch depth. The maximum frost line depth is 100-inches as seen near the tip of Minnesota, North Dakota, and Alaska, all the way to zero inches in Florida, southern Arizona, and southern ...
Local Information. Full Screen Frost Depth Map. Frost depth data download: 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.
When excavating your deck footings, you'll need to dig below the frost line. Find out how deep the frost line is in your area with our frost depth map at Decks.com.
The frost line is simply the deepest point in the ground to which ground water will freeze. It’s also referred to as the frost depth. When water changes from liquid to solid, it expands 9% in volume. This resulted frost heave can be detrimental to footings and foundations.
Generally, the coldest U.S. states have the deepest frost lines. Alaska's is the deepest at 100 inches, followed by Minnesota with 80 and North Dakota with 75. On the other hand, the hottest U.S. states have more shallow frost lines.
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.
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...