Not sure as I really don't know much about snakes but I think it's a Northern Brown Snake. I don't think it's a copperhead as I believe the pattern is more pronounced on those. Thankfully for the east coast copperheads and Timber Rattlesnake are the only two poisonous snakes here typically although I could be wrong.
The head is the wrong shape to be poisonous.
Eastern diamondback . Poisonous snakes heads are shaped like an arrowhead. Either way be cautious , even if not poisonous snake mouths are nasty and can be painful and cause infection. Btw snakes are good for rodent control.