Bad Bass - Castro Valley
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Bad Bass : Castro Valley
Bad Bass is a running event at Lake Chabot Marina in Castro Valley, California, in the San Francisco Bay Area. The event on July 18, 2026 offers three distinct courses that use the lake and surrounding parkland.
The courses listed are:
- Half Marathon on trail terrain.
- 10K on trail terrain.
- 5K on paved surfaces.
Race materials and information include race info pages, course details, directions, bib pick-up, shirts and awards, volunteer opportunities, and an FAQ. Official results are published after the event. Race photos are provided free by volunteer photographers. Sponsors are listed for the event.
The event page describes the setting around Lake Chabot Marina and highlights multiple course options for timed racing. Information is presented for participants who need logistical details such as course type, available distances, and where to find results and photos. The organizer supplies resources for volunteers and for those interested in sponsorship. Visit the organization's website for the most recent information.
