Marin Ultra Challenge

Marin Ultra Challenge is Inside Trail Racing’s premier Marin County trail race in Sausalito, California. It offers two long-distance options: a 50-mile and a 50K. The course starts at Rodeo Beach and winds through the Marin Headlands, Mt.

Tamalpais, and Muir Woods, combining coastal vistas, redwood canopies, technical single-track, and long, punishing fire-road climbs. The 50-mile route covers about 50.2 miles with around 10,550 feet of elevation gain; the 50K about 30.8 miles with roughly 6,000 feet. Features include cupless aid stations, live timing/tracking, limited trail overlap, and a post-race spread. Visit the organization's website for the most recent information.