What race distances can I run in Castro Valley?
Castro Valley has 5K (4), Half Marathon (6). The 5K is usually the easiest entry point if you are new, and the links above jump straight to each distance.
California · Race calendar
2026-2027 Running Races in Castro Valley, California
Upcoming running races in and near Castro Valley, California - 5Ks, 10Ks, half marathons and more, with dates, pricing, finish-time stats, start-line maps, and local run clubs to train with.
6 upcoming races · 5 with finish-time stats
By the numbers
The Biggest and Longest-Running
The Castro Valley races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
Sat, Nov 7, 2026Lake Chabot Trail Run Castro Valley, CAFrom $25Details Fri, Jan 1, 2027Brazen New Year's Day Castro Valley, CAFrom $73Details Fri, Jan 1, 2027Brazen New Year's Eve Castro Valley, CAFrom $68Details Sat, Apr 24, 2027SPASM Lake Chabot Trail Run Castro Valley, CAFrom $60Details Sun, Jun 6, 20272027 Lake Chabot Trail Challenge (Half Marathon & 5K) Castro Valley, CAFrom $40Details Sat, Jul 24, 2027Bad Bass Castro Valley, CARegistration opens Oct 17From $63Details
Within 100 miles
Races in Nearby Cities
More race calendars close to Castro Valley. Miles are measured center to center, so treat them as a rough guide.
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Oct 16, 2026.
Common Questions About Racing in Castro Valley
When is race season in Castro Valley?
January is the busiest month for races in Castro Valley, with 2 of the 6. If you are flexible on the date, that is the quickest way to narrow things down.
Are Castro Valley races beginner-friendly?
Yes, for the most part. Across the 5 races in Castro Valley with published results, the typical median finish is around 40:00, which means half of every one of those fields came in slower than that. Recreational runners and walk-runners are the bulk of these fields, not the exception.
Where can I train for a race in Castro Valley?
Browse Castro Valley run clubs on RunSesh to find a training group at your pace.
Are there trail races near Castro Valley?
Yes, one race around Castro Valley gets you off the pavement: 1 is a trail race.