Groundhogs like to den up in a particular environment. That translates into;
You will find them just about anywhere. In particular along the edge of wood lots. The momma will raise her young till they get too big and then she kicks them out, so they can make their own dens. They will eat just about anything like nuts and your garden produce. They like to dig dens under rock and woods piles. as well as sheds, garages and even your house. I average about four per year, in my neighborhood. ....
One interesting point that I learned just last year, is if they are spooked, they will climb trees and for some strange reason, they hang up there for a long time. I can only guess that they really don't like coming out of the tree. They also have a strange bark, if you want to call it that as it sounds more like a sharp whistle. .....
Good Luck and;
Be Safe !!!