Get ready for an exhilarating journey into the heart of Pennsylvania's trail running scene at the Fifth Street Rock Monster, held on Sunday, April 12, 2026, in Mertztown, PA. This event, hosted at the scenic Forever Farm in Alburtis, promises an unforgettable day across distances including 100K (Ultra-Marathon Relay), 26.2M (Marathon), 13.1M (Half Marathon), 10K, and 5K. The course is renowned for its challenging yet rewarding single-track trails, winding through lush woods near farmland with rolling, rugged terrain, technical sections, and plenty of rocks and roots. Runners on longer distances will experience a multi-lap format, with the marathon featuring six laps and approximately 2500 feet of vertical gain, ensuring a true test of endurance.

What truly sets the Fifth Street Rock Monster apart is its exclusive access to these stunning private trails, available only on race weekend. Formerly known as the Rockland Rad Run, this race kicks off the spring season with a festive atmosphere, often described as a "party in the woods". Participants can expect well-supported aid stations, which marathoners will pass multiple times on their journey. Typical race day conditions in mid-April include highs around 62F and lows around 40F, with a 14% chance of precipitation, providing ideal spring running weather.

Beyond the race itself, the Fifth Street Rock Monster is a full weekend celebration. The festivities begin on Saturday, April 11th, with mountain bike races, offering a chance to scout the course or simply enjoy the camaraderie. Runners and their supporters can take advantage of free on-site camping Saturday night, culminating in a lively after-party for runners that includes complimentary food and drinks. All finishers receive a commemorative coaster, a tangible reminder of their "technical tango with nature" on Pennsylvania's finest trails.