The Barn Door Hills of north-central Connecticut are a pair of prominent rocky trap rock knobs separated by a steep sided gap. They are located in Granby, Connecticut. The hills are an outlying section of the narrow, linear Metacomet Ridge that extends from Long Island Sound near New Haven, north through the Connecticut River Valley of Massachusetts to the Vermont border. The crest of the Metacomet Ridge is located 3.75 mi east at Hatchet Hill.

Recreation and conservation

East Barndoor Hill is located in the 4000 acre McLean Game Refuge founded by former United States Senator George P. McLean and now a National Natural Landmark. A hiking trail climbs the summit of the hill. West Barndoor Hill is maintained by the Granby Land Trust.