Quad Dipsea
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Quad Dipsea : Mill Valley, CA (November 29, 2025)
The Quad Dipsea is a trail running event in Mill Valley, California, listed at 28.4 miles. The route starts and finishes at Old Mill Park (Throckmorton Avenue, Cascade Way, and Old Mill Street intersection) and follows the Dipsea Trail out to Stinson Beach and back. That out-and-back sequence is then repeated to complete the Quad.
Course, logistics, and rules
The course includes many stairs and steep trail sections with about 9,000 feet of total vertical gain. Named trail sections include Dynamite, The Hogsback, The Rainforest, Cardiac, Steep Ravine, Insult Hill, and The Moors. Shortcuts are not allowed; runners must remain on the Dipsea Trail for the entire route.
Aid stations are located at Cardiac Hill, Stinson Beach, and Old Mill Park (start/finish and the halfway point). Time limits are expressed as elapsed times from the start: the halfway turnaround cutoff is 4 hours 30 minutes, the cutoff to leave Stinson Beach (beginning of Lap 4) is 6 hours 45 minutes, and the overall finish cutoff is 9 hours. Due to single-track sections, no pacers and no hiking/trekking poles are permitted.
There are no refunds, rollovers, or exchanges. A wait list is used for cancellations, and the entrant list is finalized by November 20. Registration closes on November 28. Visit the organization's website for the most recent information.
