Bad Bass - Castro Valley

JUL

18

2026

Bad Bass at Lake Chabot Marina in Castro Valley on July 18, 2026 features a half marathon, a 10K on trails and a paved 5K. Tiered registration pricing and a Remote Runner option are available.

Sat 18 Jul 2026

Castro Valley, California

Website Registration

Half Marathon 10 kilometers 5 kilometers

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Bad Bass - Castro Valley

Bad Bass is scheduled for July 18, 2026 at Lake Chabot Marina in Castro Valley, California. The event offers three race distances and uses different surfaces: a paved 5K and trail courses for the 10K and the half marathon. The courses run on and around Lake Chabot trails and parkland.

Registration is organized with tiered pricing for each distance and a Remote Runner option is available. Event materials after the race include published results and race photos provided by volunteer photographers. Volunteers support race operations.

Practical details such as course type and location are emphasized. Distances are listed below. Visit the organization's website for the most recent information.

Half Marathon: trail course at Lake Chabot.
10K: trail course.
5K: paved course.