2026 Lake Chabot Trail Challenge (Half Marathon & 5K)

The 42nd annual Lake Chabot Trail Challenge is a favorite for serious trail runners. The half marathon offers a scenic, hilly loop, mainly on dirt fire roads. Expect ridge-line views looking down upon Lake Chabot, surrounding grassy slopes, and eucalyptus groves, with Mt. Diablo and San Francisco Bay visible along the route. For a different experience, the 5K is an out and back with gentle rolling hills, mostly on paved surfaces.