Bad Bass - Castro Valley

Bad Bass 2026 : Lake Chabot Marina, Castro Valley

Bad Bass 2026 is a running event held at Lake Chabot Marina in Castro Valley, California, on July 18, 2026. The courses use trails around Lake Chabot and are presented in multiple distance options. The event notes a themed character called the Bad Bass and references the lake and surrounding trails as part of the event setting.

Distances offered include:

• Half Marathon
• 10K
• 5K

The event offers both in-person and a remote runner option. Registration fees vary by distance and by registration period, with early, mid, and late price tiers listed for each distance. The event lists the East Bay Regional Parks Campership Program as a fundraising partner.

Event information references Lake Chabot Marina and the address 17600 Lake Chabot Road, Castro Valley, California. A website is provided for additional event details and the itemized pricing structure, and the event identifies a race director as the event contact. Visit the organization's website for the most recent information.

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