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

Events nearby

Trail races at Redwood Regional Park offering 35K, half and 10K options on technical dirt trails with marked courses, chip timing, cupless aid stations, and limited field size.
A women’s trail half in the Marin Headlands covering 13.6 miles and 2,156 feet of climbing with aid stations, shuttle service, training support, childcare grants, and a $25,000 prize purse.
Virtual worldwide challenge and an in-person gathering at the San Francisco Ferry Building on October 24, 2026, fundraising for the Breast Cancer Research Foundation.
A team relay across San Francisco trails covering nearly 13 miles and over 2,000 feet of elevation, with five segments and teams of up to five runners for a $50 entry.
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