Lake Chabot Trail Challenge

Get ready to conquer the trails at the annual Lake Chabot Trail Challenge on June 7, 2026, in scenic Castro Valley, CA. This well-regarded event offers both a challenging Half Marathon (13.1M) and an accessible 5K, attracting runners from across the region. Typical race day conditions in early June boast pleasant highs around 73°F and comfortable lows near 55°F, with minimal chance of precipitation, providing ideal weather for a memorable run.

The Half Marathon course is a scenic, hilly loop primarily on dirt fire roads, offering stunning ridge-line views of Lake Chabot, surrounding grassy slopes, and eucalyptus groves. Runners will even catch glimpses of Mt. Diablo and the San Francisco Bay along the route, navigating an elevation gain of approximately 1,450 feet. For those opting for the 5K, expect an out-and-back route with gentle rolling hills, mostly on paved surfaces, featuring an elevation gain of around 380 feet. Both races begin in the Lake Chabot Regional Park area, with bib pickup and check-in starting at 7:00 AM. Parking is available with a nominal fee, and free street parking can be found nearby.

Runners can anticipate well-marked courses with ribbon and polka-dot flagging at turns to guide the way. Fully-stocked aid stations are strategically placed every 4-5 miles on the Half Marathon course, providing water, Skratch electrolyte sports drink, fresh fruit, and an assortment of snacks. While aid stations are supported with first aid and radio communication, participants are encouraged to carry their own hydration as this is a cupless event. This long-standing race, celebrating its 42nd year, promises a rewarding experience amidst breathtaking natural beauty, whether you're a seasoned trail runner or tackling your first trail 5K.