Common garter snake, Thamnophis sirtalis. They are probably the most docile snake I've ever come across in the wild, but they are mildly venomous. Now, for clarity, they don't have fangs, so to get envenomated by this snake you'd have to piss them off enough for them to latch onto you, and work the venom into you over the course of about 20 minutes of squeezing it out from between their teeth.

And even if you did get envenomated it would be enough to cause some swelling and not much more