Half Marathon Races in Castro Valley
Find Half Marathon running races in Castro Valley. Browse upcoming half marathon events, registration details, and race information for 2026.
2 races found
Trail
2026 Lake Chabot Trail Challenge (Half Marathon & 5K)
7 Jun 2026
Castro Valley, United States
“Beginning July 1, 2024, the “Honest Pricing Law” or “Hidden Fees Statute,” SB 478, makes it illegal for businesses to advertise or list a price for a good or service that does not include all. This race is well regarded amongst serious trail runners in the outlying areas.
Trail
The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual)
26 Jun 2026
Castro Valley, United States
We cannot promise you'll encounter any cryptic, aquatic creatures at Loch Chabot, but you might. We DO promise a gorgeous trail run on the scenic trails of Loch Chabot Regional Park, some quality nature therapy, and some incredible views.