Marin Ultra Challenge
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Marin Ultra Challenge
The Marin Ultra Challenge is a trail running event in Sausalito, California, held on March 13, 2027 and organized by Inside Trail Racing. The event offers two distances:
- 50 Mile
- 50K
Both courses start at the black sand of Rodeo Beach and traverse the Marin Headlands, Muir Woods, and Stinson-facing Mt. Tamalpais. Terrain includes exposed fire roads with coastal and inland views, tight technical single-track under redwood canopy, ample climbs and sweeping descents. The 50 Mile course contains about 11,000 feet of elevation gain and there is very little trail overlap between loops.
Aid stations provide a variety of foods and beverages such as energy gels, chews, stroopwafels, trail mix, pretzels, boiled potatoes with salt, Coke, ginger ale, Skratch Hydration mix, PB&J sandwiches, bananas, watermelon, tangerines, and basic first aid items. Gu energy gels are not allowed at some GGNRA aid stations, including Conzuleman, Tennessee Valley, Muir Beach, and Willow Camp. Runners are encouraged to carry at least one 20 oz bottle due to variable aid station spacing.
Race limits and logistics include a capacity of 500 runners across both distances, a 14 hour time limit for the 50 Mile, and a 10 hour time limit for the 50K; all runners must be off course by 8:30 PM. Drop bags are available at Tennessee Valley and Cardiac aid stations and runners expecting to be out after sunset should plan to have a headlamp in a drop bag.
Awards include cash prizes for the top three 50 Mile finishers, custom awards and medals, age group medals, and a Dead Last Finisher award. Visit the organization's website for the most recent information.
