Marin Ultra Challenge

MAR
13
2027
Trail races in the Marin Headlands and Mt Tam with two distances, significant elevation, live tracking, and a cupless aid station format.
Sat 13 Mar 2027
50 miles 50 kilometers

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Marin Ultra Challenge

The Marin Ultra Challenge is a trail running event in the Marin Headlands and Mt Tam near Sausalito, California. It offers two long-distance trail options that use coastal and inland trails through Rodeo Beach, the Marin Headlands, Mt. Tamalpais, Muir Woods, Stinson Beach, and other local trails. The courses include exposed fire roads with coastal views, technical single-track under redwood canopy, long climbs and steep descents.

The event details include:

  • 50 Mile - about 50.2 miles with 10,550 feet of elevation gain.
  • 50K - about 30.8 miles with approximately 6,300 feet of elevation gain.

Additional facts: field capacity is 450 runners; the 50 Mile has a 14 hour time limit and the 50K has a 10 hour time limit. The race uses colored ribbon and signs for course markings; blue ribbons mark wrong way trails. Aid stations are supplied with a variety of foods and drinks but Gu gels are not provided at several GGNRA aid stations. Drop bags are available at Tennessee Valley and Cardiac aid stations and pacers may join after the second pass through Cardiac Aid Station (mile 29.3). The event is cupless, so runners must carry their own cup or bottle. Live runner tracking will be provided and disposable timing chips are attached to bibs. Dogs are not allowed on the course; leashed dogs may be at Rodeo Beach. Visit the organization's website for the most recent information.

50 mi
50 Mile
50 km
50k
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