Inside Trail Racing organizes ultramarathon, half marathon, and 10K trail runs throughout the SF Bay Area.
Race Day
Aug 8, 2026
Registration opens, price changes, race updates: straight to your inbox.
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
Make Race PlanAre you the race director for The Napa Lapa Trail Adventure?
Claim this race to manage registration, volunteers, and race-day ops on Endurance HQ.