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Half Marathon Calendar near Castro Valley 2026-2027

Monthly updates for Castro Valley

Get new running races (and updates) in your inbox every month.

Explore the top half marathons near Castro Valley for 2026-2027! We've gathered 53 exciting races in the area. Check out our detailed list below to find your next local race.

January 2026
Jan
17
Sa

The Best Races - San Francisco

5 km 10 km 13 mi
Jan
18
Su

Crystal Springs (Winter) Trail Run

Trail Run 8 km Half Marathon ... Marathon 50 km
Jan
18
Su

Crystal Springs Trail Run

Trail Run 8 km Half Marathon ... Marathon 50 km
Jan
24
Sa

Pacifica Foothills Trail Run

Trail Run 6 mi 13 mi 19 mi
Jan
31
Sa

Coyote Hills Run

Trail Run 5 km 10 km Half Marathon
February 2026
Feb
7
Sa

Mt. Umunhum Trail Conquest - Winter

Trail Run 5 km 7 mi ... 26 mi 50 km
Feb
7
Sa

Golden Gate Trail Run

Trail Run 8 km Half Marathon ... Marathon 50 km
Feb
14
Sa

Bay Breeze - San Leandro

Trail Run 5 km 10 km Half Marathon
Feb
21
Sa

Redtail Ridge

Trail Run 5 km 10 km ... 30 km 50 km
Feb
21
Sa

Montara Mountain Trail Run

Trail Run 10 km 13 mi ... 26 mi 50 km
Feb
28
Sa

Victory

5 km 10 km Half Marathon
March 2026
Mar
1
Su

Livermore Valley Half Marathon

5 km Half Marathon
Mar
7
Sa

Skyline Ridge Trail Run

Trail Run 10 km Half Marathon 50 km
Mar
21
Sa

Oakland Marathon

5 km 10 km Half Marathon Marathon
Mar
21
Sa

Redwood (Spring) Trail Run

Trail Run 5 km 5 mi ... Marathon 50 km
Mar
22
Su

Horseshoe Lake Half Marathon

Trail Run 13 mi
Mar
28
Sa

Western Pacific Marathon

Trail Run 5 km 10 km Half Marathon
Mar
28
Sa

Zoom San Francisco

5 km 10 km Half Marathon
April 2026
Apr
4
Sa

Golden Gate Headlands Marathon

Trail Run 6 mi 13 mi 26 mi
Apr
4
Sa

Diablo Trails Challenge

Trail Run 5 km 10 km Half Marathon 50 km