Quad Dipsea
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Quad Dipsea
The Quad Dipsea is a 28-mile trail race comprising two out-and-back trips along the Dipsea Trail, with start and finish at Old Mill Park in Mill Valley, California. The course includes a total of 9200 feet of ascent and an equal amount of descent over the full distance. Most of the route is single track with a mix of clean trail and sections that have many roots and rocks.
The course contains numerous stair flights, including 686 steps in the first three flights. Short cuts are not permitted; runners must follow the marked trail for the entire route.
Aid stations are positioned along the course and are stocked with typical ultra race supplies plus GU Roctane Endurance Drink. Races that take place within the GGNRA may not distribute gel packets, so participants must carry their own gels. Key aid locations by mile are listed as follows: Cardiac (mile 4.3), Stinson Beach (mile 7.0), Old Mill Park turnaround (mile 14.0), Cardiac (mile 18.3), Stinson Beach (mile 21.0), Cardiac (mile 23.7), and Old Mill Park finish (mile 28.0).
Drop bags may be left at the Old Mill Park turnaround at mile 14; drop bags are not transported to other aid stations. Registration opens on August 1, 2026. This edition is the 43rd running of the event. Visit the organization's website for the most recent information.
