frost line in pa is 42 inches
6" below grade
They are located below the frost line
The frost depth level below area's usually not less than 800 mm .
The frost line depth for the Ottawa-Montreal area ranges from 1.4m to 1.5m below surface elevation.
A concrete foot generally must extend one foot below the frost line. in some cases it may have to be more or less.
6" below grade
5.6 feet below ground level.
Depends on what you plan to put ON the footer. If a building- yes. Above the frost line, when the soil freezes it will push the foundation up- but not evenly.
They hibernate in burrows, below the frost line.
the maximum depth of ground below which the soil does not freeze in winter.
Average is 4ft, building code requires water pipes to be at least 6ft deep to be well below frost line and safe from frezzing.