I hate to respond with my life's experience but ironically, I just watched 1 man dig a hole 2'x2'x2' in minutes, somewhere it's been an average of -10C for approx. 10 days...
...just saying.
One way to figure out if the ground ever becomes frozen is to look at whether it's normal to have basements. Basements are necessary in places where the ground freezes. The house didn't appear to have a basement as there were no below grade windows anywhere along the front and one side of the house.