2 events in Castro Valley, California
From big races to Saturday morning group runs—find marathon events and connect with the local endurance sports community.
2 events
Run
Cycling
Triathlon — no events here yet
Swim — no events here yet
parkrun — no events here yet
Half Marathon
10k
Open Water — no events here yet
Trail
Walk — no events here yet
Kids — no events here yet
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Castro Valley
2 events in Castro Valley-
Sat, Sep 26, 2026