When
Saturday, July 18th, 2026
Where
17600 Lake Chabot Road, Castro Valley CA
Distances
Half
About this race
Race Overview
Rising up from the depths of Lake Chabot, the Bad Bass (a strangely kilt-wearing, bagpipe-playing Scottish bass with teeth) shows itself once again on July 18th 2026!
Mystery of the Bad Bass
- Scottish Origin: Why is he Scottish?
- Location: What is he doing in Castro Valley?
- Musical Skill: How can he play bagpipes with his fin?
- Trail Enthusiast: Why is he so bad-to-the-fishbone? Maybe he just knows how awesome the trails of Lake Chabot really are!
Join Us
Whatever the Bad Bass is doing here, we hope you'll join us at the beautiful Lake Chabot Marina in Castro Valley for the scenic Bad Bass 5K, 10K or Half Marathon!
Event Details
- Date: July 18, 2026
- Location: 17600 Lake Chabot Road, Castro Valley, CA
- Race Options: 5K, 10K, Half Marathon
- Registration: Sign up here
Course map
Train with a club
Run clubs near Castro Valley to train with before race day.
See all run clubs near Castro Valley →
Suggested Races
Organize this race?
Claim it free to manage your listing — and get it featured for free, while spots last.