The frost line in the city of Chicago is thought to be 36 inches. The average Chicago winter does not exceed the 36 inch frost line, but extremely cold winters can.
Well, there more then one frost line in Illinois: 1) 10" to 20" for Southern Illinois 2) 15" to 30" for Central Illinois (frost line for Peoria) 3) 20" to 35" for Northern Illinois
3 feet 6 inches
no Frost
I saw a good chart of average frost penetration for Illinois. 10" to 20" for southern Illinois 15" to 30" for central Illinois (frost line for Peoria) 20" to 35" for northern Illinois
no Frost
frost line in pa is 42 inches
The frost line in Spokane, WA is typically around 24 inches deep. This is the depth at which soil is expected to freeze during the winter months. It is important to consider the frost line when planning construction projects to prevent damage from freezing and thawing.
42 inches
one metre
42"
3ft
What is the frost line depth in louisville Kentucky