3 events in Contra Costa County, California

From big races to Saturday morning group runs—find half marathon events and connect with the local endurance sports community.

• Wildcat Half Marathon [finishers.com] - Facebook
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  Sat, May 30, 2026

  Half Marathon Run Trail

  Contra Costa County, California, United States
  OpenStreetMap Google Maps
• Berkeley Trail Adventure [insidetrail.com] [Register at ultrasignup.com] - Facebook - Instagram
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  Sat, Sep 12, 2026

  10k 35k 50k Half Marathon Trail Ultra

  Lake Anza Road, Contra Costa County, California, 94708, United States
  OpenStreetMap Google Maps

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