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Trail Running Calendar near Castro Valley 2025-2026

Explore the top trail runs near Castro Valley for 2025-2026! We've gathered 150 exciting races in the area. Check out our detailed list below to find your next local race.

January 2026
Jan
31
Saturday

Race to the Flagpole

5 km 10 km
February 2026
Feb
7
Saturday

Mt. Umunhum Trail Conquest - Winter

Trail Run 5 km 7 mi ... 42 km 50 km
Feb
14
Saturday

Bay Breeze - San Leandro

Trail Run 5 km 10 km 21 km
Feb
21
Saturday

Redtail Ridge

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

Montara Mountain Trail Run

Trail Run 10 km 21 km ... 42 km 50 km
Feb
28
Saturday

Victory

5 km 10 km 13 mi
March 2026
Mar
1
Sunday

Livermore Valley Half Marathon

5 km 21 km
Mar
1
Sunday

Zoom Angel Island

Trail Run 5 mi 10 mi 15 mi
Mar
14
Saturday

Marin Ultra Challenge

Trail Run 31 mi 50 mi
Mar
14
Saturday

Zoom San Francisco

5 km 10 km 21 km
Mar
20-22
Fr - Su

Oakland Marathon

5 km 10 km 21 km 42 km
Mar
21
Saturday

Redwood (Spring) Trail Run

Trail Run 5 km 5 mi ... 42 km 50 km
Mar
28
Saturday

Western Pacific Marathon

Trail Run 5 km 10 km 21 km
April 2026
Apr
4
Saturday

Golden Gate Headlands Marathon

Trail Run 10 km 13 mi 26 mi
Apr
4
Saturday

Diablo Trails Challenge

Trail Run 5 km 10 km 21 km 50 km
Apr
4
Saturday

Antioch Rotary Club Bunny Hop 5K

5 km
Apr
11
Saturday

Romancing the Island Half Marathon

Trail Run 10 km 21 km
Apr
18
Saturday

Badger Cove Half Marathon

Trail Run 5 km 10 km 21 km
Apr
25
Saturday

Mt. Tam Wild Boar Half Marathon

Trail Run 10 km 21 km
May 2026
May
3
Sunday

Aztec Run

5 km
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