Bad Bass - Castro Valley
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Bad Bass 2026
Bad Bass is an annual running event held at Lake Chabot Marina in Castro Valley, California. The event utilizes the trail networks surrounding Lake Chabot, providing participants with a scenic environment for trail running.
Participants can choose from three primary on-site distances:
- Half Marathon
- 10K
- 5K
The event also offers a Remote Runner option for those who wish to participate from a different location. For the Half Marathon, a specific hiker start is available for individuals who plan to walk the course and expect to take between 3.5 and 4 hours to complete the distance.
The event supports the East Bay Regional Parks Campership Program, and registration is open to the general public with tiered pricing based on the date of entry. Facilities and the start/finish area are located at 17600 Lake Chabot Road. Visit the organization's website for the most recent information.
