Lag Bon 10K
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Event details
The Lag Bon 10K is a trail running fundraiser held on Sunday, March 22, 2026, at the Lake Lagunitas Picnic Area at the end of Sky Oaks Road in Fairfax, CA. The event is dedicated to World Water Day. Ticket sales collected in excess of event costs will be donated to the NGO Evidence Action for its Safe Water Now program. Registration opens January 1, 2026. Space is limited to 100 runners and race day registration is not available.
Course and logistics
The course distance is 10K with approximately 400 feet of elevation gain and loss. The route is technical in places, with stairs, bridges, roots, rocks, and some flat trail sections. Aid stations and bathrooms are located after Bon Tempe Dam at the 3.5 mile point and at the start/finish area. The event will be held rain or shine; participants should expect cold, wet, or muddy conditions. A two-hour time limit applies to complete the course due to permit restrictions. No dogs or strollers are allowed.
Registration, packet pickup and awards
The registration fee is $50 and includes an event T-shirt, finisher medal, stickers, and GU energy gels or chews. Registrations after March 6 may not receive the requested shirt size. Packet pickup is scheduled at the San Francisco Running Company San Anselmo location on Saturday, March 21 from 12:00 pm to 4:00 pm. Prizes in each division (Men, Women, Non-binary) include gift cards for first, second, and third place. Visit the organization's website for the most recent information.
