In western Pennsylvania the frost line falls at 36", when installing underground waterlines 42" is perfered.
3'
frost line in pa is 42 inches
Below the frost line of your area. Your local building code will tell you what the requirements are.
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
It depends on where you live and is associated with latitude. The further you go north or south of the equator, the deeper the frost line tends top be.
Footings, the concrete pads upon which foundation walls are built, must be located beneath the frost line in order to prevent a building from heaving when the ground freezes. If the site is sloped maintaining a constant elevation for the footings would either cause the footings to be above the frost line or significantly deeper than the frost line at one end of the building. Stepping the footings enables them to follow the slope of the site and remain below the frost line without going too deep under the ground. It allows the foundation wall heights to be minimized because the footings are kept as close to the surface as possible.
32"
no Frost
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
frost line in pa is 42 inches
The frost line in Salt lake city is 30 in. I would assume that that is average for most of the state.
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.
one metre
42 inches
42"
3ft
i dont know whho cares Most concrete foundations are buried 4' to get below the frost line which is around 3'.