Quad Dipsea
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Quad Dipsea
The Quad Dipsea is a 28.4 Miler held in Mill Valley, California on November 28, 2026. The course begins and finishes at Old Mill Park and follows the Dipsea Trail to Stinson Beach and back, then repeats that route for a total of four laps.
The route includes many stairs and sustained climbing, with about 9,000 feet of vertical gain over roughly 28 miles. Within a few hundred yards the trail climbs three flights of stairs described as being as tall as a fifty story building, then continues through areas named Windy Gap, Muir Woods, Redwood Creek, Dynamite, The Hogsback, The Rainforest, Cardiac, Steep Ravine, Insult Hill, and The Moors before reaching Stinson Beach.
Aid stations are located at Cardiac Hill, Stinson Beach, and Old Mill Park, the latter serving as both the start and the halfway turnaround. Runners must stay on the Dipsea Trail for the entire event; shortcuts are not permitted. Because the course is single track, pacers and hiking poles are not allowed. There are no refunds, rollovers, or exchanges. A wait list is used to fill cancellations, and the entrant list is finalized by November 10. Visit the organization's website for the most recent information.
