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The frost depth refers to how deeply frost can penetrate into the ground. In Martinsville, Virginia, the frost depth is around 18 inches deep.
18"
Wilmington, North Carolina, is located in New Hanover County. The frost line depth in New Hanover County is 2 inches.
24"
The frost line in the state of West Virginia is about 30 inches. This is the depth that frost can penetrate the soil.
For Orange County is 50 inches or 4'-2". I would use 4'-6" for design.
3.5 to 4 ft
Walter Archer Frost died on March 10, 1964, in Martinsburg, Berkeley County, West Virginia, USA.
frost depth in eastern ohio
Up to July 2008 it was 4' per the NYC Code. I haven't dealt enough with the newly adopted code. I imagine it hasn't changed.
I've read it was 12" for frost line and 6" more = 18"
The frost depth level below area's usually not less than 800 mm .