Mt. Tam Wild Boar Half Marathon
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Event
The 2026 Mt. Tam Wild Boar Half Marathon & 10K takes place on April 25, 2026, at Mt. Tamalpais State Park in Mill Valley, California. The event is limited to 300 participants. Distances offered:
- Half Marathon
- 10K
Course and logistics
Runners start at Rock Springs and follow Ridgecrest Blvd along the spine of Bolinas Ridge. The route combines paved roadways and dirt single-track trails with views of Bolinas Lagoon, the Pacific Ocean and the Marin County watershed. 10K runners turn left onto Willow Camp Trail and return to Rock Springs via the Coastal Trail. Half marathon runners continue to Bolinas/Fairfax Road and then return via the Coastal Trail. The course is marked with orange ribbon; a course monitor will direct 10K runners and a sign marks the half marathon turnaround.
The course cut-off time is 3 hours (13:45 min/mile pace for half marathon, 29 min/mile for 10K). Aid stations: one at mile 5 for the 10K; at miles 2.35, 7 and 12 for the half marathon. Food and drink are available at the finish. T-shirts are provided to participants; medals are awarded to all half marathon finishers and personalized ribbons are mailed to top three finishers, male and female, in each age group. Bibs are mailed beginning two weeks before the event; unreceived bibs may be picked up on race morning. Headphones and audio devices are not allowed on course. Parking is in the Rock Springs parking area. Registrations are non-refundable and non-transferable; a rollover credit may be available if requested by March 25, 2026, subject to a $20 fee. Visit the organization's website for the most recent information.