The Quad Rock 50, taking place on May 9, 2026, in Fort Collins, CO, offers runners an unforgettable journey through the challenging and picturesque trails of Lory State Park and Horsetooth Mountain Park. This premier spring ultramarathon features both a 50-mile and a 25-mile distance, crafted by trail runners for trail runners. The course itself is a demanding tour of the Fort Collins skyline, with stunning vistas stretching east to the Great Plains and west to the layered ridgelines of the Rocky Mountains, crowned by the majestic Longs Peak in the distance. Expect to navigate approximately 85% gnarled singletrack and 15% dirt road, providing a diverse and engaging terrain.

The Quad Rock course is renowned for its distinctive "symmetrical sawtooth profile," presenting a significant test of endurance and mental fortitude. The 25-mile loop involves a formidable 5,500 feet of vertical gain, guiding runners over three major climbs, including the iconic Horsetooth Rock and Arthur's Rock. Those tackling the 50-mile distance will complete this challenging loop twice, running the second circuit in reverse, accumulating an impressive 11,000 feet of elevation gain. This unique two-loop format means runners encounter each major ascent and descent twice, often leading to a significant mental battle at the 25-mile turnaround, where the finish line barbecue tantalizingly awaits before the second half begins. Aid stations are fully stocked with essentials like Gnarly Nutrition and Näak products, though runners should bring their own flasks and bottles as it is a cupless race. Drop bags are available at key locations, including the Horsetooth Trailhead and the Soldier Canyon finish/25-mile turn.

Runners consistently praise the Quad Rock for its challenging nature, breathtaking scenery, and exceptional camaraderie. Typical race day conditions in early May often see highs around 67°F and lows around 41°F, with an 11% chance of precipitation, though participants should be prepared for variable weather, including potential thunderstorms or muddy trails. The race kicks off from the Soldier Canyon Picnic Area in Lory State Park, where a festive post-race experience with food, music, and awards awaits all finishers, celebrating their remarkable achievements on this unforgettable Colorado ultra.