Peak Mountain, also called Copper Mountain, is a traprock ridge in East Granby, Connecticut, on the Metacomet Ridge, known for cliffs, broad views, and a compact but varied landscape. Formed from basalt laid down as continental rifting began near the end of the Triassic Period, its tilted rock layers created steep slopes, ledges, and ravines that support uncommon plant communities. The ridge is also an important migration route for birds of prey, with more than 20 raptor species recorded there. Crossed by the Metacomet Trail and visually linked to Old Newgate Prison below, it has also been a focus of conservation in the face of development and quarrying.