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

Mar

20

VALENCIA Trail Race

Valencia, California, United States

$107.00 - $187.00

Trail running

Ultra Half-Marathon 10K

Apr

03

Bedrock Valley Trail Runs

Hemet, California, United States

$15.00 - $115.00

Trail running Running Cycling

Marathon Half-Marathon 15K 10K +9

Apr

10

Nature Made Great Race: Half Marathon, 5K, 10K, 15K, 10M, 1M

Agoura Hills, California, United States

$33.95 - $107.55

Trail running Running

Half-Marathon 10K 16.6K 15K +3

Apr

24

No Foolin' Foot Race

San Carlos, California, United States

$20.00 - $65.00

Trail running

15K 10K 5K 1K

May

01

Santa Clarita Trail Race

Santa Clarita, California, United States

$50.00 - $180.00

Trail running

5K 10K 15K 30K +4

May

08

Grizzly Peak Trail Run

Berkeley, California, United States

Free - $90.00

Trail running Running

10K Half-Marathon 30K Marathon +3

Jul

10

San Lorenzo River Trail Run

Santa Cruz, California, United States

Free - $90.00

Trail running Running

10.1K Half-Marathon 30K Marathon +3

Oct

16

Lake Hodges Trail Festival

San Diego, California, United States

$15.00 - $110.00

Trail running Running Duathlon

50K 25.1K 15K 10.3K +7

Oct

16

Heart of Cool Trail Run

Cool, California, United States

$30.00 - $55.00

Trail running

5K 10K Half-Marathon

Oct

17

SPACEROCK Trail Race

Agua Dulce, California, United States

Trail running

22.4K 14.3K 10K 5K

Oct

11

Bizz Johnson

Susanville, California, United States

Running

Ultra Half-Marathon 10K

Oct

10

Rock It in Chino Hills 5K & 10K

Brea, California, United States

Trail running

5K 10K