Observed arrival · 2026-11-05

A county-by-county frost-line check

frostdepthcheck.com Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

FrostDepthCheck estimates normal-winter frost depth for US counties and gives a suggested dig depth for footings, posts, or water lines.

Landing page captured for the 2026-11-05 issue.

For: People planning footings, posts, or water lines
Worth noticing: The calculation assumes sandy silt under snow, a stated limitation on how to read its county estimates.

Field notes

The page says it matches each of 3,144 US counties to its nearest NOAA weather station and uses 1991–2020 daily temperature normals with the Modified Berggren equation. Displayed examples range from 5 inches for King County, Washington, to 64 inches for Cass County, North Dakota; calculations assume sandy silt under snow. The site distinguishes these estimates from adopted code requirements and directs readers to confirm the controlling depth locally.

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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