That light blue map (except for the line going to Moosonee on James Bay) sort of follows what might be considered white tail deer range too. Wonder if hard winters in the light blue fringe areas might control populations? I live in that area in Ontario and MNR already have cameras out on the agricultural and fringe areas from Thunder Bay - Manitoba border looking for them. They would have certainly thrived in this years winter, but last year with a consistent 50+ cm of snow on the ground and a lot of -25-30 days I am not sure how they would have handled that.
I've seen domestic pigs thrive outside while -30, but with a steady feed source. IMO that would be the deciding factor for how far north they can go, is the food supply. They can burrow and will get almost as hairy as a bear, but will need something to chew on.