Quad Dipsea

Embark on a legendary challenge with the Quad Dipsea, a 28.4-mile ultra-distance trail race set for November 28, 2026, in the scenic landscape of Mill Valley, CA. This iconic event, now in its 44th running, is a test of grit and endurance, taking runners on two demanding out-and-back journeys along the famed Dipsea Trail. The course is renowned for its relentless elevation changes, featuring a staggering 9,276 feet of combined climb and descent, packed into an extraordinary ratio of elevation to miles. Runners will conquer hundreds of varied stairs—including 671 in the initial half-mile—and navigate technical single-track paths riddled with roots and rocks, traversing sections like "Dynamite," "The Hogsback," "The Rainforest," "Cardiac," "Steep Ravine," and "Insult Hill" as they plunge into Muir Woods and climb to panoramic views of the Pacific Ocean before reaching Stinson Beach. Unlike its shorter counterparts, shortcuts are strictly prohibited, ensuring every runner experiences the full, unadulterated challenge of this historic trail.

The Quad Dipsea kicks off at 7:30 AM from Old Mill Park in Mill Valley, which also serves as the halfway turnaround point and the finish line. Aid stations are strategically placed throughout the course at approximately miles 4.5, 7.1, 9.7, 14.2, 18.7, 21.3, 23.9, and the finish, offering essential sustenance like GU, PB&Js, bananas, potatoes, pretzels, salt, water, and GU Brew electrolyte drink to fuel your journey. Drop bags are accessible at the start and halfway point. Typical race day conditions in late November feature comfortable highs around 59°F and lows around 44°F, with an 18% chance of precipitation, offering a refreshing fall day for trail running. This race has garnered a reputation for its tough yet rewarding experience, fostering incredible community and camaraderie among participants who repeatedly cross paths on the double out-and-back course.

The Quad Dipsea is more than just a race; it's a deep dive into Northern California's trail running heritage, often described by runners as one of the toughest yet most beloved ultras they've encountered. Its rich history, having evolved from an informal "fun run" in the early 1980s, draws a limited field of 250-350 dedicated ultrarunners annually, selling out quickly due to its unique appeal and challenging nature. While the course will push your physical and mental limits, leading to potential leg cramps and extreme fatigue, the stunning scenery, the uplifting support from volunteers, and the vibrant camaraderie among runners create an unforgettable atmosphere. Finishing the Quad Dipsea is a remarkable accomplishment, culminating with modest post-race facilities, including the famous black bean soup, a well-deserved reward for conquering one of the most distinctive trail ultras around.