Mt. Tam Trail Run
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Mt. Tam Trail Run : event overview
The Mt. Tam Trail Run is held in November 2025 at Mt. Tamalpais State Park / Stinson Beach, California. The event offers multiple distances and is limited to a total capacity of 500 runners across all distances. Races are professionally chip timed using MyLaps and Race Director; disposable timing chips are attached to the back of each bib. The 50K has an advertised 8.5 hour time limit and organizers state that all runners must be off the course by 4:00 PM. The 50K awards a prize purse for overall male and female top three finishers: $300, $200, and $100.
Course, aid and logistics
The courses start at Stinson Beach, climb to viewpoints on Mount Tamalpais, and return via trails in the Headlands to the beach. Surface types include technical dirt trails and non-technical fire roads; hiking or trekking poles are permitted. Distances and elevation gains are:
- 50K - 30.0 miles, 6,000 ft elevation gain
- 30K - 18.5 miles, 3,900 ft elevation gain
- Half Marathon - 13.0 miles, 2,800 ft elevation gain
- 10K - 6.8 miles, 1,600 ft elevation gain
Aid stations provide a variety of foods and drinks (water, Skratch Hydration, cola, snacks, PB&J, fruit, etc.); Gu gels are restricted at some aid stations on GGNRA property. The event is cupless - runners must carry their own bottle or reusable cup; disposable cups are not provided. Parking is available in the Stinson Beach Day Use Area and is free; dogs are allowed at the beach on leash but are not permitted on Mt. Tam trails. Visit the organization's website for the most recent information.