The Pumpelly Trail is a challenging but rewarding hike to the summit of Mount Monadnock, the most climbed mountain in the world. The trail is 8 miles out-and-back and starts from a parking area near Dublin Lake. 

Monadnock State Park is located in and around the 3,165-ft. Mount Monadnock. The park is surrounded by thousands of acres of protected highlands. In 1987, Mount Monadnock was designated a National Natural Landmark. The park offers year-round recreational opportunities.

Monadnock State Park is open year-round unless closed or restricted by posting. While the staff is present around the park daily, limited visitor services and amenities are provided and day-use fees are required through the winter season only on weekends and holidays.

The AllTrails website has a description and map of a hike on the Pumpelly Trail.