Logo

Tamalpa Headlands 50K

Mill Valley, United States • 16 Aug 2025

The Tamalpa Headlands 50K is a challenging ultramarathon held annually in Marin County, California, starting and finishing at Santos Meadow near Muir Woods. Covering 50 kilometers with about 6,500 feet of elevation gain, the single-loop course features renowned trails such as Coastal, Miwok, Steep Ravine, Matt Davis, and Dipsea. Runners experience a mix of fast fire roads, steep climbs, technical singletrack, and stunning views of the Bay Area and Pacific Ocean. The event, supported by the Tamalpa Runners and Arc'teryx, also serves as the USATF Trail 50K Championship. Aid stations are strategically placed, and the race emphasizes environmental respect and a cup-free policy. Visit the organization's website for the most recent information.

United States California Mill Valley

Race information

Website Registration
50 km
6500 m+
50k
Kids' One Mile Challenge
Visit the organization's website for the most recent information.
Trail runs nearby

Diablo Summit Stomp

Walnut Creek - 26 mi from Mill Valley

Take on scenic dirt trails and choose from 5K, 10K, half marathon, or the summit 30K at the Diablo Summit Stomp in Walnut Creek. Walkers welcome and well stocked aid stations keep you fueled as you climb toward Mount Diablo.

Matt Yeo Memorial Aggie XC Open

Martinez - 23 mi from Mill Valley

The 27th Annual Matt Yeo Memorial Aggie XC Open, presented by the HOKA Aggies, is held at Radke Martinez Regional Shoreline in Martinez, California. The meet features three 4.1-mile cross-country races for Women, Masters Men, and Open Men,..

Oakland Hills Trail Run

Oakland - 16 mi from Mill Valley

Join the Oakland Hills Trail Run on October 25 2025 at Redwood Regional Park with 35K, half marathon or 10K options on scenic technical trails. Limited to 300 runners, finishers earn a custom medal and enjoy well stocked aid stations.

Golden Gate Park XC Open

San Francisco - 11 mi from Mill Valley

The 39th Golden Gate Park XC Open, held at Lindley Meadow (30th Ave & JFK Dr) in San Francisco's Golden Gate Park, is a 5k cross-country race over grass, dirt, and rolling hills. It features Masters Women 40+ and Masters Men 40+ along with..

Oakland Tech 5km Fundraiser Race

Piedmont - 18 mi from Mill Valley

Run through towering redwoods at the Oakland Tech 5 km fundraiser, with a 1 mile fun run or walk for all levels. Enjoy scenic trails while supporting Oakland Tech PTSA and the school cross country team.

Lake Chabot Trail Run

Castro Valley - 30 mi from Mill Valley

...

Explore scenic trails around Lake Chabot Marina in Castro Valley with distances from 8K to 50K and a kids dash for little runners. Pre registered runners get T shirts and all finishers receive custom medals and stocked aid stations.