Running Races in Castro Valley, California
9 upcoming races in Castro Valley, updated nightly. For radius search from your exact zip, use the Race Finder.
Racing in Castro Valley: what the calendar looks like
There are 9 upcoming races on the Castro Valley calendar over the next 12 months, with race dates in 8 of the next 12 months. Among complete calendar months, January 2027 has the most listed races, with 2. By race count, Castro Valley ranks 17th among California cities.
Of those, 8 offer a Half Marathon, 6 offer a 5K and 4 offer a 10K. The next marathon on the calendar is SPASM Lake Chabot Trail Run on April 17. The next half marathon is Brazen New Year's Eve 2026 on December 31. Where fees are published, the median entry in Castro Valley is $50, above the California median of $30.
Close enough for a race-day drive: Alameda (8 races, 10 miles), Oakland (7 races, 10 miles), Fremont (7 races, 11 miles).
Races by month
- Dec 20261 race
- Jan 20272 races
- Feb 20271 race
- Apr 20271 race
- Jun 20271 race
- Jul 20271 race
- Aug 20271 race
- Sep 20271 race
December 2026
- Thu 12/31Brazen New Year's Eve 2026Castro Valley, CA · 5K · 13K · Half Marathon · register ↗
January 2027
- Fri 1/1Brazen New Year's DayCastro Valley, CA · 5K · 10K · Half Marathon · from $50 · register ↗
- Fri 1/1Brazen New Year's EveCastro Valley, CA · 5K · 10K · Half Marathon · from $50 · register ↗
February 2027
- Sat 2/20Chabot/Redtail Ridge Trail RunCastro Valley, CA · 50K · 35K · Half Marathon · 10K · 5K · Trail · register ↗
April 2027
- Sat 4/17SPASM Lake Chabot Trail RunCastro Valley, CA · 5 Miles · Half Marathon · 17.9 Miles · Marathon · 50K · Trail · from $60 · register ↗
June 2027
- Sun 6/62027 Lake Chabot Trail Challenge (Half Marathon & 5K)Castro Valley, CA · Half Marathon · 5K · Trail · from $40 · register ↗
July 2027
- Sat 7/24Bad BassCastro Valley, CA · Half Marathon · 6.4 Miles · 3.4 Miles · from $55 · register ↗
August 2027
- Sun 8/1Skyline 50k Endurance RunCastro Valley, CA · 50K · Half Marathon · register ↗
September 2027
- Sat 9/25Dick Collins FiretrailsCastro Valley, CA · 100K · 50 Mile · Marathon · register ↗
Where to stay in Castro Valley
Race-weekend hotel search, dates prefilled for check-in the night before.
- Dec 31Brazen New Year's Eve 2026Find hotels for this race weekend
- Jan 1Brazen New Year's DayFind hotels for this race weekend
- Jan 1Brazen New Year's EveFind hotels for this race weekend
Hotel links are affiliate links. Booking through them costs you nothing extra and helps keep RunRace USA free.
Planning a race
- Getting inlotteries, qualifiers, and how entry works for the races that sell out
- Lottery watchwhich race lotteries and registration windows are open right now
- Choosing a first marathona practical guide to picking a debut race