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Half Marathon calendar near Castro Valley 2025-2026

Explore the top half marathons near Castro Valley for 2025-2026! We've gathered 71 exciting races in the area. Check out our detailed list below to find your next local race.

December 2025
Dec
13
Saturday

Summit Rock Half Marathon

Trail Run 5 km 10 km 13 mi
Dec
13
Saturday

Hark the Herald Half Marathon

Trail Run 10 km 13 mi
Dec
27
Saturday

Brazen Almost New Year's Eve

5 km 10 km 13 mi
Dec
27
Saturday

Brazen New Year's Eve

Trail Run 5 km 10 km 13 mi
January 2026
Jan
1
Thursday

Brazen New Year's Day

Trail Run 5 km 10 km 13 mi
Jan
3
Saturday

Hacienda Hills Trail Run - Winter

Trail Run 5 km 10 km ... 26 mi 50 km
Jan
24
Saturday

Coyote Hills Run

Trail Run 5 km 10 km 13 mi
February 2026
Feb
7
Saturday

Mt. Umunhum Trail Conquest - Winter

Trail Run 5 km 7 mi ... 26 mi 50 km
Feb
14
Saturday

Bay Breeze - San Leandro

Trail Run 5 km 10 km 13 mi
March 2026
Mar
1
Sunday

Livermore Valley Half Marathon

5 km 13 mi
Mar
20-22
Fr - Su

Oakland Marathon

5 km 10 km 13 mi 26 mi
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