10K races in California, United States — 2026 trail running calendar

Sep

06

Mammoth Bar Trail Runs

Auburn, California, United States

Trail running

Half-Marathon 10K

Sep

11

The Honey Badger Half (& 10K/5K)

Santa Venetia, California, United States

$45.00 - $105.00

Running Trail running

5K 10K Half-Marathon +2

Oct

10

Rock It in Chino Hills 5K & 10K

Brea, California, United States

$60.00 - $70.00

Trail running

5K 10K

Oct

11

Bizz Johnson

Susanville, California, United States

$75.00 - $110.00

Running

Ultra Half-Marathon 10K

Oct

17

SPACEROCK Trail Race

Agua Dulce, California, United States

$85.00 - $175.00

Trail running

22.4K 14.3K 10K 5K

Oct

17

Lake Hodges Trail Festival

San Diego, California, United States

$15.00 - $145.00

Trail running Running Duathlon

50K 25.1K 15K 10.3K +7

Oct

17

Heart of Cool Trail Run

Cool, California, United States

$40.00 - $70.00

Trail running

5K 10K Half-Marathon

Oct

31

ZombieRunner Halloween

San Jose, California, United States

Free - $80.00

Trail running Running

5K 10K Half-Marathon Marathon +6

Nov

07

Epicpalooza

Moorpark, California, United States

$55.00 - $75.00

Trail running

10K 5K

Nov

14

Catalina Island Half-Marathon & 10K

Avalon, California, United States

$25.00 - $150.00

Trail running Running

Half-Marathon 10K 1K

Nov

14

ZombieRunner Quarry Lakes

Fremont, California, United States

Free - $70.00

Trail running Running

5K 10K Half-Marathon 3.2K +4

Nov

26

Zoom Turkey Trot

San Jose, California, United States

Free - $70.00

Trail running Running

5K 10K Half-Marathon 3.2K +4