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! Why is he Scottish? What is he doing in Castro Valley? How can he play bagpipes with his fin? We have no idea how to answer those questions. Why is he so bad-to-the-fishbone? Maybe he just knows how awesome the trails of Lake Chabot really are! 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!
How to enter the Bad Bass Half Marathon
- Run 13.1mi
- Run 10km
- Run 5km
Bad Bass Half Marathon routes
The 5K is entirely on paved trails. The 10K is about 50% paved trails and 50% fire trails. The half marathon is approximately 25% paved trails and 75% fire trails.
The 5K and 10K will essentially be out and back courses, while the half marathon is a loop.
All courses include rolling hills that are mostly runnable -- except for the climb up Live Oak for the half marathon and 10K that is best power-hiked!
The half marathon has a 4 hour time limit. Half runners must reach the 4th aid station (mile 10) by 11:30 am. This is a 20+ minute per mile page.
For half marathon participants who wish to hike the course and take more than about four hours, we will offer a "Hiker Start" at 7:30 am. Those starting at 7:30 should carry water as the first and second aid stations might not be 100% up and running, depending on the hikers speed. Hiker starts will not be eligible to win the race or for age group awards, but will be listed as official finishers in the Hikers Division and will still receive finisher medals.
Bad Bass Half Marathon weather forecast
Clear throughout the day.
Meet the organizer
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