Mount Holyoke, a traprock mountain, elevation 935 feet (285 m), is the westernmost peak of the Holyoke Range and part of the 100-mile (160 km) 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. The mountain is crossed by the 110-mile (180 km) Metacomet-Monadnock Trail and numerous shorter trails. Mount Holyoke is the home of J.A. Skinner State Park which is accessible from Route 47 in Hadley, Massachusetts.

The Holyoke Range or Mount Holyoke Range is a traprock mountain range located in the Connecticut River Valley of Massachusetts. It is a subrange of the narrow, linear Metacomet Ridge that extends from Long Island Sound near New Haven, Connecticut north through the Connecticut River Valley of Massachusetts to the Vermont border. It is also a subrange of the Appalachian Mountains. A popular hiking destination, the range is known for its anomalous east–west orientation, high ledges and its scenic character. It is also notable for its unique microclimate ecosystems and rare plant communities, as well as significant historic sites, such as the Mount Holyoke Summit House and the Horse Caves.