Mount Sugarloaf State Reservation is a state-owned public recreation area managed by the Massachusetts Department of Conservation and Recreation located in South Deerfield, just west of the Connecticut River.

The state park includes the summits of North Sugarloaf Mountain and South Sugarloaf Mountain, as well as 1.75 miles of frontage on the Connecticut River and two river islands.

Portions of the park property along the river are used by the University of Massachusetts Amherst for agricultural research.

[3] The state maintains an automobile road and an observation tower on South Sugarloaf,[4] open from late spring through the fall foliage season.

Parking for a fee is available at the base of the mountain and at the summit of the auto road.