Half Marathons in Castro Valley, California 2026 — MyNextRace

There are 3 half marathons in Castro Valley, California in 2026. The next is the Brazen New Year's Eve on January 1.

Fri, Jan 1 · Castro Valley, CA Castro Valley

Virtual NYE 5KNYE 10KNYE HALF MARATHON +1

From $50 Open

Fri, Jan 1 · Castro Valley, CA Castro Valley

Virtual 5K10KHALF MARATHON +1

From $50 Open

Sat, Jul 24 · Castro Valley, CA Castro Valley

Virtual 5K5K10K +6

From $55 Closed

Half Marathons in Castro Valley, California