Half-Marathon races in California, United States — 2026 trail running calendar

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

17

Horseshoe Lake Trail Run

Los Gatos, California, United States

Free - $90.00

Trail running Running

8.2K Half-Marathon 30K Marathon +2

Apr

24

SPASM Lake Chabot Trail Run

Castro Valley, California, United States

Free - $90.00

Trail running Running

8K Half-Marathon 28.8K Marathon +2

May

08

Grizzly Peak Trail Run

Berkeley, California, United States

Free - $90.00

Trail running Running

10K Half-Marathon 30K Marathon +3

May

23

Diablo Trail Run

Clayton, California, United States

Free - $90.00

Trail running Running

6.4K 16.1K Half-Marathon Marathon +3

Jun

05

Cinderella Trail Run

Oakland, California, United States

Free - $90.00

Trail running Running

8K Half-Marathon 30K Marathon +3

Jun

06

Lake Chabot Trail Challenge (Half Marathon & 5K)

Castro Valley, California, United States

$40.00 - $65.00

Trail running

Half-Marathon 5K

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

Aug

14

Redwood (Summer) Trail Run

Oakland, California, United States

Free - $90.00

Trail running Running

8K Half-Marathon 30K Marathon +3

Oct

16

Heart of Cool Trail Run

Cool, California, United States

$30.00 - $55.00

Trail running

5K 10K Half-Marathon

Oct

18

Fleet Feet Fall Classic - Trail October 18th, 2026

Chico, California, United States

Trail running

Half-Marathon 6.4K