Breakneck Ledge Loop
A rugged 4.5-mile yellow triangle loop from Houghton’s Pond through the Great Blue Hill section, walked counterclockwise.

The Breakneck Ledge loop is a rugged yellow triangle route through the Great Blue Hill section of the reservation. It starts at Houghton’s Pond and is marked in one direction only, so you have to walk it counterclockwise.
Trailhead parking
Directions to Houghton’s Pond →Guided hikes
Our staff lead groups up Great Blue Hill, connecting the trail to the landscape, the climate record, and 141 years of daily observation. Every guided hike ends inside the Observatory.
Staff-led · By appointment, any day, year-round · Observatory tour included · From $250 per group, members save
DCR lists it at about 4.5 miles, taking 2.5 to 3 hours.
The yellow triangles are marked in one direction only.
DCR rates it moderately difficult, with rugged woodland and rolling hills.
Trail details are based on the Massachusetts Department of Conservation and Recreation’s recommended color-coded hiking trails. Trails and markers change, so carry the DCR map and confirm conditions with DCR at 617-698-1802.
Breakneck Ledge runs through the Great Blue Hill section. The Observatory waits at the top.
Monthly Skymail, event announcements, and research summaries.
