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Bad Bass

Castro Valley, California, United States

calendar_today 18 Jul, 2026

directions_run Running

sell $55.00 – $90.00

About the Event

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!

Races Offered

Remote Runner

Jul 18, 2026

straighten

Distance — 13.1 Miles

terrain

Type — Running

timer

07:30

sell

$55.00

HALF MARATHON

Jul 18, 2026

straighten

Distance — 13.2 Miles

terrain

Type — Running

timer

08:30

sell

$90.00

10K

Jul 18, 2026

straighten

Distance — 6.4 Miles

terrain

Type — Running

timer

08:55

sell

$72.00

5K

Jul 18, 2026

straighten

Distance — 3.35 Miles

terrain

Type — Running

timer

09:10

sell

$63.00

Weather History

These values represent the 3-year monthly averages for July in Castro Valley.

thermostat Temperature

13.2° / 22.3°

wb_sunny Feels like

12.1° / 19.8°

light_mode Avg sunshine hours

12h 21m

water_drop Avg rainfall

0.1 mm

ac_unit Avg snowfall

—

air Avg wind speed

11.0 km/h (Light breeze)

opacity Sweat loss rate

Moderate

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Very High (8.0)

humidity_mid Humidity

75.4%

wb_twilight Sunrise

05:59

nightlight Sunset

20:27

About Castro Valley

Learn more about the host city, Castro Valley.

Castro Valley is an unincorporated town in the inner East Bay in the Bay Area of California. It has a population of about 60,000 and is located north of Hayward and east of San Leandro and south of the Oakland hills. Since it is unincorporated, Castro Valley is governed by the County of Alameda, which has its county seat in Oakland.