Embark on an unforgettable trail running adventure at the FOURmidable, set to challenge runners on February 21, 2026, in the stunning Sierra Nevada foothills of Auburn, CA. With distances including a 50K, 35.5K, Half Marathon, and 13K, this race truly lives up to its name, derived from the four major climbs that define its demanding courses. Runners will be immersed in picturesque scenery featuring majestic mountain views, dense forests, and breathtaking vistas of the American River Canyon, traversing a mix of technical single-track trails, fire roads, and scenic ridgeline paths.

The FOURmidable course is renowned for its significant elevation gains, with the 50K boasting over 6,000 feet of cumulative climbing, including notorious ascents like Cardiac Hill, K2 (also known as Training Hill with over 900 feet of gain in less than a mile), Knickerbocker, and the final push up Overlook Hill. Even the Half Marathon presents a formidable challenge with 2,706 feet of elevation gain. Runners will navigate sections of the iconic Western States Trail, passing the historic No Hands Bridge. Strategically placed, fully stocked aid stations offer water, electrolyte drinks, gels, salt tablets, soda, snacks, and even boiled potatoes, supported by enthusiastic volunteers who are a highlight for many participants. Participants should be prepared for a cupless event, bringing their own reusable hydration vessels.

Beyond the rigorous challenge, the FOURmidable offers a vibrant race experience, celebrating camaraderie and support within the trail running community. Finishers are rewarded with major swag, and a lively post-race atmosphere awaits at Overlook Park, the start and finish line, complete with post-run meals. Typical race day conditions in late February see comfortable highs around 57°F and lows around 37°F, with a 24% chance of precipitation, creating an ideal cool climate for tackling the challenging terrain. This event, known for its strong organization by SingleTrack Running and its history of attracting top talent, promises a test of grit and a truly rewarding accomplishment for all who dare to take on its "FOURmidable" hills.