Don't bet on there not being snakes. When I still lived in Va just outside of DC, one of the guys I worked with got some up close and personal time with a rattle snake. He lived in the burbs. Coons are night time critters, chances are you won't see them. But if you saw a possum chances are high there's coons around too. It's not as much of an issue if the girls are up at night and have secure latches to keep them out.