4' (1.2m)
Frost depth will of course vary depending on the severity of the winter and the ground cover with the deepest frost occurring under areas cleared of snow and devoid of sod. If you draw an east-west roughly through the middle of the state, the rule of thumb has been 5' above the line, and 3.5 feet below the line.
The frost line depth in the northern counties of Ontario is about 5 feet. Most supply lines like water and gas are placed below that depth.
1.5 m
The frost line is most commonly the depth to which the groundwater in soil is expected to freeze. Maps of this can be found on Wikipedia, and different frost lines for different areas can be found on that regions department of labor website.
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
frost line in pa is 42 inches
18 in
In western Pennsylvania the frost line falls at 36", when installing underground waterlines 42" is perfered.
4'
Based on construction guidelines for a garage, the minimum depth of a below frost foundation is 3'11". That is the city of Oshawa guidelines.
The average front line depth in Connecticut is around 42 inches. However, the frost line in northern areas of the state can reach depths of over 50 inches.
The frost line in Georgia ranges from 12" in the Southern part of Georgia to 30" in the Northern part of Georgia. Metro Atlanta frost line is 24". Macon is 18". Dalton is 28".
frost depth in eastern ohio
The frost line depth for Cheyenne, Wyoming is 36" for foundation.
The frost depth level below area's usually not less than 800 mm .
What is the frost line depth in louisville Kentucky
Frost line in SLC is 30"in
The frost line depth for the Ottawa-Montreal area ranges from 1.4m to 1.5m below surface elevation.
The frost line depth for South Point, Ohio is 42 inches. You can get more information about the frost line depth by contacting the local building department in South Point.
24" will cover all of TN