Mount Holyoke, a traprock mountain, elevation 935 feet, is the westernmost peak of the Holyoke Range and part of the 100-mile Metacomet Ridge. The mountain is located in the Connecticut River Valley of western Massachusetts, and is the namesake of nearby Mount Holyoke College. The mountain is located in the towns of Hadley and South Hadley, Massachusetts. It is known for its historic summit house, auto road, scenic vistas, and biodiversity.