Muir Woods Marathon

Event overview

The 36th annual Stinson Beach/Muir Woods event on May 9, 2026 offers trail race options at Stinson Beach Parking Lot, Stinson Beach, CA. The field is limited to 300 participants and the event is organized by Enviro-Sports.

Distances:

• Marathon
• Half Marathon
• 7 Mile

Course and logistics

The course leaves sea level at Stinson Beach and climbs into the wooded trails of Muir Woods, following the Dipsea Trail to Steep Ravine. The route includes a wooden ladder, natural rock and wooden staircases, and sections that require scrambling under tree trunks. Runners pass brooks, waterfalls, redwoods and oaks, reach a summit with panoramic views, then descend back to Stinson Beach. The course is marked with orange ribbon. Aid stations are located at miles 3.8, 7.5, 10.5, 14.2, 17.2 and 22.2; participants are advised to carry water. The 7 Mile course turns at the first aid station; half marathoners and marathoners complete a loop, with marathoners repeating the loop plus an additional out-and-back segment. Hikers and walkers are welcome. The overall course cut-off is 6.5 hours.

Services and rules

Bib numbers are mailed beginning two weeks before the race; unreceived bibs may be picked up at the start/finish area on race morning. Safety pins and course maps are available at check-in. T-shirts are provided to all participants; finisher medals are awarded for the full and half marathons. Personalized award ribbons for top three male and female finishers in each age group will be mailed a few weeks after the event. Parking is available at Stinson Beach Park. Headphones and other audio devices are not allowed. Registrations are non-refundable and non-transferable; refund protection options and a rollover-credit policy apply. Visit the organization's website for the most recent information.