Cavern Rock Park

115 Westminster Rd, Weymouth, MA 02189, USA

Weymouth Parks/Trees/Grounds: (781) 337-5100

Owned By: Town of Weymouth

Weymouth’s Cavern Rock Park is an unusually rocky property with a challenging 0.7-mile loop trail. This is a great place to explore when you need a change of scenery!


Cavern Rock Park was acquired as conservation land by the Town of Weymouth in 1968. It features numerous rocky outcroppings, many covered with moss. Deep within the property, don’t miss the old stone wall — it extends for quite a distance!

This land is within the region of the Massachusett (or Massachuseuk). To learn more about local Native American tribes, we encourage you to interact with their members. The Mattakeeset band of the Massachusett, and the Massachusett tribe at Ponkapoag, both share information on their websites. 

Trail Description

This property features a 0.7 mile loop trail. It is very rocky. It is also quite steep in places, offering a more challenging hike than what is typically found in the area. The trail extends through the forest, between and over some large rock formations. While rocky, it is not “rock climbing” terrain (no need for ropes or carabiners). The trail is marked with white blazes.

Habitats and Wildlife

The forest here is primarily oak, with some maple, beech and black walnut, plus pine and the occasional hemlock, and plenty of greenbrier. The land drains to Whitman’s Pond nearby, and lies within the watershed of the Weymouth Back River. The Weymouth Back River flows for about 10 miles through Weymouth, and empties into the Atlantic Ocean at Hingham Bay, just south of Grape Island and Slate Island.

  • A photograph of a parking area with green trees.
  • A photograph of an interpretive sign and a trailhead.
  • A photograph of a trail passing between large boulders, with a forest in the background.
  • A photograph of a rocky trail through a green woodland.
  • A photograph of a rocky outcropping in a green woodland.
  • A photograph of the sun shining through green trees with a rocky outcropping.
  • A photograph of an old stone wall in the woods and a tree with a white blaze.
  • A photograph of a clearing in a forest with green trees and rocky outcroppings.
115 Westminster Rd, Weymouth, MA 02189, USA

Historic Site: No

Park: No

Beach: No

Boat Launch: No

Lifeguards: No

Size: 36 acres

Hours: Dawn to Dusk

Parking: Very limited on-site parking (3 cars) on Westminster Road.

Cost: Free

Trail Difficulty: Medium, Hard


Interpretive signage.

Dogs: Dogs must remain on a leash no more than 6 feet in length. Scoop the poop!

Boat Ramp: No

ADA Access: No

Scenic Views: Yes

Waterbody/Watershed: Weymouth Back River watershed

Other Things to Do at This Site