This park has closed. The trails are there, but there's no lift service. I don't know whether you're allowed to hike up with your bike (As of September 29, 2020). This is a lift-serviced downhill free ride mountain biking park open from May to November.
From the Launch Bike Park website: In 2010, Launch Bike Park was opened for lift accessed downhill and freeride mountain biking. It currently boasts 11 skillfully crafted trails which challenge riders of all levels. The trails feature roots, rocks, rock drops, bridges, berms, bridge drops, jumps, gaps, and a brand new dedicated jump line. At the base, riders experience a laid back, friendly atmosphere where people from all over can socialize, get tips, and swap stories. To experience all this and more, come see what Launch has to offer so close to home. Launch Bike Park is located at the Spring Mountain Ski Area, in beautiful Spring Mount, Pennsylvania. It is less than an hour drive north from the city of Philadelphia and has established itself as the Philadelphia area's year-round destination for outdoor fun and adventure. Spring Mountain also offers adventure activities including zip line canopy tours, a rock climbing tower, and the Perkiomen Trail. This 19 mile multi-use trail runs right past Spring Mountain for those who wish to partake in a scenic and relaxing bike ride. Plus there are cross country trails on Spring Mountain, so bring the whole family!