The Stinson Beach/Muir Woods Marathon, Half Marathon & 7 Mile marks its 36th annual running on Saturday, May 9, 2026. This rigorous trail event is defined by its immediate ascent from sea level into the dense, towering old-growth forests of Muir Woods. Runners navigate the legendary Dipsea Trail and Steep Ravine, encountering technical elements such as a wooden ladder, natural rock staircases, and fallen tree trunks. Due to the narrow trails and steep drop-offs, the event strictly prohibits the use of headphones to ensure participant safety during passing. Participation is capped at 300 runners, emphasizing an intimate and environmentally conscious racing experience.
| Race Distance | Start Time | Course Markings | Incentives |
|---|---|---|---|
| Marathon | 08:00 AM | Two loops + Out & Back | T-Shirt & Finisher Medal |
| Half Marathon | 08:00 AM | Single Loop (Orange Ribbon) | T-Shirt & Finisher Medal |
| 7 Mile | 08:00 AM | Turn at 1st Aid Station | T-Shirt & Award Ribbon |
Stinson Beach is an unincorporated community in Marin County, California, with a permanent population of approximately 540 residents. The demographic profile of the area is primarily White (Non-Hispanic) at 89.6%, followed by Hispanic or Latino at 4.2%, and Asian at 3.5%. The median household income in this coastal enclave is roughly $118,000 USD. Geographically, the race is situated within the Mount Tamalpais State Park and Muir Woods National Monument. The terrain is characterized by steep coastal ridges and deep canyons filled with coastal redwoods. Runners experience a dramatic microclimate transition from the moist, foggy coastline of the Pacific to the shaded, humid interior of the redwood groves.
The course features a generous 6.5-hour cutoff time, making it accessible to hikers and walkers. Athlete check-in occurs at the Stinson Beach parking lot starting at 7:00 AM for those who did not receive their bibs by mail. Aid stations are strategically placed throughout the route, though the organizers strongly advise carrying personal water due to the vertical gain. For logistical inquiries or distance changes, the event directors at Enviro-Sports can be reached at 415-868-1829. Registrations are handled via Race Roster, and participants must adhere to the non-refundable rollover policy if they cancel by April 9.
May 09, 2026
Distance — 7mi
Type — Running
08:00
$76.88
May 09, 2026
Distance — 7mi
Type — Running
08:00
$28.74
May 09, 2026
Distance — 21km
Type — Running
08:00
$87.58
May 09, 2026
Distance — 21km
Type — Running
08:00
$28.74
May 09, 2026
Distance — 42km
Type — Running
08:00
$103.63
May 09, 2026
Distance — 42km
Type — Running
08:00
$39.44
These values represent the 3-year monthly averages for May in Stinson Beach.
Learn more about the host city, Stinson Beach.
Stinson Beach is a beach town in Marin County, California.
Read more launchWatch highlights and course previews from previous years.
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