Southeast of Pittsburgh and Ligonier in the Forbes State Forest, the 10+ mile Linn Run Trail System is open to mountain biking. The system consists of the Grove Run Trail (3.8 miles), Fish Run Trail (2.5 miles) and the Quarry Trail (3.9 miles) among others. There are several trailheads along Linn Run Road.
Note: Only the Quarry Trail is currently open to biking.
Overall, Linn Run Trail System is the 49th most popular mountain bike trail of all 75 mountain biking rides in Pennsylvania.