Quad Dipsea
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Event overview
The Quad Dipsea is a trail running event in Mill Valley, California, scheduled for Saturday, November 29, 2025. The race distance is 28.4 miles with about 9,000 feet of total vertical. The course is an out-and-back to Stinson Beach and back to Old Mill Park, and that round trip is then repeated to complete the full event. Registration opens August 1, 2025 and closes November 28, 2025. A wait list is used; invitations to register are sent as spots open and the entrant list is finalized by November 20.
Course, aid, and rules
The course follows the Dipsea Trail for the entire route; shortcuts are not allowed. Terrain includes many stairs, steep climbs and descents, single-track trails, creek crossings, and named trail sections such as Windy Gap, Muir Woods, Dynamite, The Hogsback, The Rainforest, Cardiac, Steep Ravine, Insult Hill, and The Moors. Aid stations are located at Cardiac Hill, Stinson Beach, and Old Mill Park (start/finish and the halfway point). Due to single-track sections, pacers are not permitted and hiking or trekking poles are not allowed. There are time limits and cutoffs at the halfway turnaround, at the Stinson Beach turnaround, and at the finish. Refunds, rollovers, and exchanges are not permitted. Visit the organization's website for the most recent information.
