2026 Mt. Tam Wild Boar Half Marathon & 10K

The 38th Annual Mt. Tam Wild Boar Half Marathon & 10K is a premier coastal trail race scheduled for Saturday, April 25, 2026, in Mt. Tamalpais State Park, Mill Valley. This event is highly sought after for its scenic route along the "spine" of Bolinas Ridge, offering expansive views of the Pacific Ocean, Bolinas Lagoon, and the Marin County watershed. The course is a technical mix of paved roads and rolling single-track dirt trails. To preserve the trail experience and ensure safety on narrow ridges, the event is strictly limited to 300 participants.

Race Logistics and Safety

Athlete check-in takes place between 7:00 AM and 7:45 AM at Rock Springs near the Mountain Theater, though participants who receive their bibs by mail can proceed directly to the start. The Half Marathon includes three aid stations (miles 2.35, 7, and 12), while the 10K features one at mile 5. Due to the steep drop-offs and narrow passing zones, headphones are strictly prohibited to ensure runners can communicate effectively. All participants receive a t-shirt, and unique to the Half Marathon, all finishers receive a medal. Personalized award ribbons are also mailed to the top three male and female finishers in each age group following the event.

Regional and Community Context

Mill Valley (94941) is an affluent city in Marin County, California, with a 2026 population of approximately 14,300 residents. Nestled at the foot of Mount Tamalpais, the community is deeply connected to environmental conservation and outdoor athletics. The local economy is driven by high-income professionals, with a median household income exceeding $175,000. Mill Valley is world-famous for its redwood forests and its role as the birthplace of mountain biking and legendary trail races like the Dipsea.

The demographic profile of Mill Valley is approximately 85% White, 6% Hispanic or Latino, 5% Asian, and 1% Black or African American. The community is characterized by an active, health-conscious population with a median age of 48.2 years. Mount Tamalpais itself rises to 2,572 feet and serves as a major ecological landmark for the San Francisco Bay Area. The Wild Boar race leverages this unique geography—transitioning from shaded groves to exposed coastal ridges—providing a rugged, high-altitude experience that has made it a staple of Northern California's trail running culture for nearly four decades.