27th Annual
Tamalpa Headlands 50K
Register Here & Volunteers Needed!
Saturday, August 15th

Presented by Arc’teryx and Tamalpa Runners
USATF PA Grand Prix Event

Total Purse $10,000

1st M/F: $2,500 – 2nd M/F: $1,500 – 3rd M/F: $1,000

Featuring many of Marin County’s most famous trails — Coastal, Miwok, Steep Ravine, Matt Davis and Dipsea — the 26th annual the Tamalpa Headlands 50k presented by Arc’teryx and Tamalpa Runners provides a spectacular setting for this classic, single-loop ultramarathon that was founded in 1998. The event has the full support of Marin’s largest running club, the Tamalpa Runners as well as UltraRunning Magazine.

Just a hop and a skip from downtown San Francisco, the Tamalpa Headlands 50k is a demanding ultramarathon with approximately 6,500-feet of elevation gain featuring fast fire road running, steep climbs, flowy singletrack, technical sections and stunning views of the Bay Area, Pacific Ocean and beyond. The race starts and finishes at the idyllic and the beloved Santos Meadow in Muir Woods as the staging area for the start and finish line after-party.

Please join us on Saturday, August 15th, 2026, to enjoy all the splendor that the Marin Headlands and Mount Tamalpais has to offer in one of the country’s most stunning places to celebrate the sport of ultrarunning