I think it is non poisonous. Still, it will scare the 💩 out of you. Had a similar problem years ago. Garage door was open and I found a snake laying beside the car drivers side door. Limited lighted and seeing eerie markings like a copperhead or rattlesnake. Turned out it wasn’t. Used a broom to get it out of the garage and no issues. Told my wife and she said glad I got it out of the garage, since she would leave an hour later or more after I left for work and I would have probably come home and found her dead. So far I’ve seen copperheads and rattlesnakes as well , as rat snakes and black snakes. I know we live where the snakes are so not an issue for me, but it does scare the 💩 out of when me when I’m surprised by one.