Ultramarathon Races in Castro Valley
Find Ultramarathon running races in Castro Valley. Browse upcoming ultramarathon events, registration details, and race information for 2026.
2 races found
Trail
Skyline 50k Endurance Run
2 Aug 2026
Castro Valley, United States
50km · Ultra
Skyline 50k Endurance Run is a 50 km ultra trail race held in Castro Valley, CA. The event takes place in August 2026.
Trail
Dick Collins Firetrails
26 Sept 2026
Castro Valley, United States
100km · Ultra
Dick Collins Firetrails is a 100 km ultramarathon trail race held in Castro Valley, CA. The event takes place in September 2026.