Lake Chabot Trail Challenge

Event overview

The Lake Chabot Trail Challenge takes place on June 7, 2026, in Castro Valley, California. This is the 42nd annual running of the event at Lake Chabot (17404 Lake Chabot Rd, Castro Valley, CA 94546). Registration deadlines and pricing noted by the organizer: pre-registration guarantees a t-shirt if completed by May 10, 2026. Pre-registration prices listed are Half Marathon $65 and 5K $40; race day prices listed are Half Marathon $70 and 5K $45. Registration must be completed by June 6 to avoid price increases. A nominal fee of about $5 applies for the Chabot parking lot; free parking is available on Lake Chabot Rd and nearby streets.

Distances

• Half Marathon
• 5K

Course and logistics

The half marathon is a hilly loop mainly on dirt fire roads with ridge-line views of Lake Chabot, grassy slopes, and eucalyptus groves; Mt. Diablo and San Francisco Bay are visible from parts of the route. The half has a 3.5-hour time limit. The 5K is an out-and-back of about 3.1 miles, mostly on paved surfaces with gentle rolling hills. Both courses have water stations plus first aid and radio support; organizers advise bringing personal hydration. Both races are chip-timed. Race packet and bib pick-up occurs at the Willow picnic site (finish area) on race day; packets are not mailed. The event runs rain or shine and there are no refunds. Finisher medals are awarded, and age-division medals go to the top three in each division (12 divisions for the half, 9 for the 5K). Official race photos are available after the event. Visit the organization's website for the most recent information.