How deep is the frost line in VA zip code 24343?

Answer 1

During the winter, not more than a couple of inches, depending on where you live. Along the coast, it's less; in the mountains, it may be higher.

In the summer, there is no frost line.

Answer 2

That last answer is totally wrong.

Check this website of hammerpedia dot com then /frost-line-map/

Your area is a minimum of 10”. It’s important for building purposes and the codes reflect the needed depth for decks, etc.