Lake Chabot Trail Challenge
Castro Valley, United States • 7 Jun 2026
Lake Chabot Trail Challenge - 2026
The 42nd annual Lake Chabot Trail Challenge takes place on June 7, 2026 in Castro Valley at Lake Chabot (17404 Lake Chabot Road). This event includes the following distances:
- Half Marathon : scenic hilly loop mainly on dirt fire roads.
- 5K : out and back, mostly paved with gentle rolling hills.
The half marathon route follows ridge lines with views of Lake Chabot, surrounding grassy slopes, and eucalyptus groves; Mt. Diablo and San Francisco Bay are visible along the course. The half marathon has a 3.5 hour time limit. Water stations are provided with first aid and radio support; participants are advised to bring personal hydration. The 5K features one water station with first aid and radio support. Both races are chip timed. The race takes place rain or shine and there are no refunds.
Pre-registered runners are guaranteed a short sleeve t-shirt if registered by May 10, 2026. Posted prices list entry fees for the 5K and the half marathon and higher fees for race day registration; race day payments accepted in cash, check, or Venmo. There is a nominal fee for the Chabot parking lot and free parking on Lake Chabot Road and nearby streets. Race packet and bib pick-up is at the Willow picnic site, and race photos will be available after the event. Awards include finisher medals and age division medals for top finishers in each division. Visit the organization's website for the most recent information.