Call your local Building Code office for your region of Saskatechewan.
They will tell you the legally required footing depth for your locale.
There are places in the northern US with required frost depths of 100″ or more, so a 6 footing depth for your region may be too shallow.
Generally speaking, permanent structures need to have footings placed below the frost level for that region, extend to permafrost, or be constructed as ‘frost protected shallow foundations’.
Your local code officials can answer any questions you have regarding each.