In Manitoba, we have garter snakes, and lots of them. check out this [link] This area is about about a 1 1/2 hour drive north of where I live. You will find rattlers in Alberta and British Columbia when you get into the foothills of the Rockies.
They go back to the pits every fall like clockwork to hibernate (guess that's how they survive our cold winters) I know they are harmless and I don't mind one at a time, but seeing them in those mass pits creeps me out. I thought you would find it interesting.