2 running events in Castro Valley, California
From big races to Saturday morning group runs—find running events and connect with the local endurance sports community.
2 events
Cycling
Triathlon — no events here yet
Swim — no events here yet
parkrun — no events here yet
Marathon
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-
Thu, Dec 31, 2026 at 7:30 AMSee full details
Whether you're looking to squeeze in your first trail run or you're looking to log that 1,000th mile before the clock strikes midnight on 12/31/2026, this is your chance.
Note: This year we will have back-to-back events at Lake Chabot, Castro Valley with a 5K, 10K and half marathon!
New Year's Eve, Thursday, 12/31/2026
New Year's Day, Friday, 1/1/2027*
Make it a double and join us both days and earn the Brazen New Year Mega-Medal!
*Note: Each race is a unique event on its own and requires separate registration.