raceIQ

Running races in Castro Valley, CA

7 upcoming running races in Castro Valley, CA — 10Ks, half marathons and marathons, with dates and field depth before you enter.

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Most competitive fields

Ranked by how fast the front of the field ran in recent editions, compared with every race we track at that distance.

  1. 12027 Lake Chabot Trail Challenge (Half Marathon & 5K)Sun, Jun 6Castro Valley5KHalf marathon
  2. 2Bad BassSat, Jul 24Castro Valley5K10KHalf marathon
  3. 3Brazen New Year's DayFri, Jan 1Castro Valley5K10KHalf marathon
  4. 4Lake Chabot Trail RunSat, Nov 7Castro Valley5KHalf marathonMarathon
  5. 5SPASM Lake Chabot Trail RunSat, Apr 17Castro ValleyHalf marathonMarathon

Which of these could you place in? raceIQ ranks them by where your pace would finish, in your age group and gender.

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November 2026

January 2027

February 2027

April 2027

June 2027

July 2027