Race Discovery
Bad Bass
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Bad Bass

Castro Valley, California, United States View on map
Jul 18, 2026 (America/Los_Angeles local time)
Running

About this race

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!

Pick your distance

Running

HALF MARATHON

Jul 18, 2026 Half-Marathon 8:30 AM
$100.00
Closed

10K

Jul 18, 2026 10.3K 8:55 AM
$82.00
Closed

5K

Jul 18, 2026 5.4K 9:10 AM
$73.00
Closed

Remote Runner

Jul 18, 2026 Half-Marathon 7:30 AM
$60.00
Closed

Typical race-day weather

Based on 9 years of historical conditions on this event's race dates in Castro Valley.

Temp (°C)
Minimum temperature (race-day average) 13.0° / Maximum temperature (race-day average) 21.9°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-day average) 13.0° / Maximum feels like — heat index / wind chill (race-day average) 21.9°
Wind (km/h)
Average wind speed (race-day average)
17.1
Precip (mm)
Average precipitation (race-day average)
0.0mm
Humidity
Average relative humidity (race-day average)
77.1%

Course

Route map and elevation profile

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

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Results — Bad Bass

2019 edition View Results
2018 edition View Results

Other races near Castro Valley

Different organizers, within 40 miles, in the next three months

🏃 Plan Your Next Race in Castro Valley

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 7 Castro Valley events

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