3 feet 6 inches
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.
no Frost
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
no Frost
one metre
42"
42 inches
3ft
What is the frost line depth in louisville Kentucky
48"
the frost line is 36"
They are located below the frost line