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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.

May 2025
May
31
Saturday

Calero Trail Run - Spring

Trail Run 5 km 10 km ... 26 mi 50 km
May
31
Saturday

Beer City Half San Jose

5 km 10 km 13 mi
May
31
Saturday

San Jose Half Marathon

8 km 13 mi
May
31
Saturday

Wildcat Half Marathon

Trail Run 5 km 10 km 13 mi
June 2025
Jun
1
Sunday

Lake Chabot Trail Challenge

Trail Run 5 km 13 mi
Jun
1
Sunday

Cinderella Trail Run

Trail Run 8 km 13 mi ... 26 mi 50 km
Jun
14
Saturday

Skyline Ridge Trail Run

Trail Run 21 km 50 km
Jun
14
Saturday

The Best Races - San Francisco

5 km 10 km 13 mi
Jun
21
Saturday

Angel Island Half Marathon

Trail Run 5 mi 13 mi
Jun
21
Saturday

The Best Races - San Francisco

5 km 10 km 13 mi
Jun
27-30
Fr - Mo

The Rock The Loch Half Marathon

Trail Run 5 km 10 km 13 mi
July 2025
Jul
5
Saturday

The Best Races - San Mateo

5 km 10 km 13 mi
Jul
19
Saturday

Bad Bass - Castro Valley

5 km 10 km 13 mi
Jul
26
Saturday

Calero Hills Trail Fest

Trail Run 5 km 10 km ... 30 km 26 mi
Jul
26-27
Sa - Su

The San Francisco Marathon

5 km 10 km 13 mi 26 mi
Jul
26
Saturday

The Best Races - San Francisco

5 km 10 km 13 mi
August 2025
Aug
2
Saturday

Summer Breeze

5 km 10 km 13 mi
Aug
2
Saturday

Rodeo Valley Trail Run

Trail Run 8 km 13 mi 30 km 50 km
Aug
3
Sunday

Skyline 50k Endurance Run

Trail Run 21 km 50 km
Aug
9
Saturday

Bear Creek Run

Trail Run 5 km 10 km 13 mi
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