Saturday, August 16

Tamalpa Headlands 50K

Experience the thrill of running amidst the breathtaking beauty of Northern California trails at the Tamalpa Headlands 50K, renowned as the 2025 USATF 50k Trail Championship. Taking place on August 16th, 2025, this iconic ultramarathon features a challenging single-loop course with 6,500 feet of elevation gain, showcasing the majestic Marin County trails including Coastal, Miwok, and Dipsea. Hosted by NIKE Trail and the Tamalpa Runners of Marin, this event promises fast fire road running, steep climbs, flowy singletrack, and scenic vistas of the Bay Area and Pacific Ocean. With a rich history dating back to 1998, this race offers a podium purse that rivals previous years, making it a must-attend for both seasoned and aspiring ultrarunners. Join us for an unforgettable day of racing in one of the most stunning locations for ultrarunning, complete with aid stations, strict course rules, and USATF Trail 50k Championship eligibility. Don't miss your chance to be part of this extraordinary event that celebrates the essence of ultrarunning in the picturesque setting of the Marin Headlands and Mount Tamalpais.