Bad Bass
- Date
- July 18, 2026
- Distance
- 5K · 10K · Half Marathon
- Price
- $68–$95
From the Organizer
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! 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!
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
75°
Typical Low
58°
Chance of Rain
1%
Based on US Climate Normals data from Hayward Air Terminal, 4 mi from the venue.
Host City
About Castro Valley, CA
City Elevation
393 ft
Nearest Airport
OAK
San Francisco Bay Oakland International Airport · 9 mi
Time Zone
Pacific Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Bad Bass, put it on the calendar, and turn “someday” into a start date.
Coming Up
More Running races near Castro Valley, CA
The City Eats & Stack Run Club - Hayward 5K
1 Mile · 5K · From $10 · 2300 Panama St
5 miles away
Summer Breeze
5K · 10K · Half Marathon · From $68 · 1400 Monarch Bay Dr
5 miles away
Redwood (Summer) Trail Run
Half Marathon · Marathon · Ultra · Other · From $60 · Chabot Space & Science Center (annex lot)
8 miles away
Beer City Half™ Bishop Ranch
1 Mile · 5K · 10K · Half Marathon · From $30 · 6000 Bollinger Canyon Rd
8 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Bad Bass?
- Bad Bass is a running race held in Castro Valley, California on July 18, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Bad Bass?
- Saturday, July 18, 2026 in Castro Valley, California at 17600 Lake Chabot Road. Check the event page for exact start times and wave schedules.
- How do I register for the Bad Bass?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Bad Bass
Jul 18, 2026