Bad Bass - Castro Valley
JUL
18
2026
Run Bad Bass at scenic Lake Chabot Marina in Castro Valley on July 18, 2026, choosing a paved 5K or trail 10K and half marathon. Organized by Brazen Racing with free race photos, online results and a friendly race day atmosphere.
Sat 18 Jul 2026
13 miles
10 kilometers
5 kilometers
Always double-check with the organizer's website! This page may contain affiliate links.
Event overview
Bad Bass is a running event held at Lake Chabot Marina in Castro Valley, California, in the San Francisco Bay Area. The race date is July 18, 2026. The event is organized by Brazen Racing and includes pages for race information, directions, bib pick-up, start times, shirts and awards.
Courses and race services
The event offers three distances:
- 5K - paved course
- 10K - trail course
- Half Marathon - trail course
Race photos are provided for free by volunteer photographers. Official results are published online. Volunteers are used for event operations, and sponsors include GU Energy. Visit the organization's website for the most recent information.
13 mi
Bad Bass Half Marathon
10 km
Bad Bass 10k
5 km
Bad Bass 5k
