Half-Marathon 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

06

Diablo Trail Run

Clayton, California, United States

Free - $100.00

Trail running Running

6.4K 16.1K Half-Marathon Marathon +2

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

02

Sgrail Marin - Triathlon & Trail Half Marathon

San Rafael, California, United States

Free - $390.00

Triathlon Running Trail running

Kids "Fun" Event Ultra Half-Marathon +1

Oct

11

Bizz Johnson

Susanville, California, United States

$75.00 - $110.00

Running

Ultra Half-Marathon 10K

Oct

17

Heart of Cool Trail Run

Cool, California, United States

$40.00 - $70.00

Trail running

5K 10K Half-Marathon

Oct

18

Fleet Feet Fall Classic - Trail October 18th, 2026

Chico, California, United States

$90.00

Trail running

Half-Marathon 6.4K

Oct

31

ZombieRunner Halloween

San Jose, California, United States

Free - $80.00

Trail running Running

5K 10K Half-Marathon Marathon +6

Nov

07

Lake Chabot Trail Run

Castro Valley, California, United States

Free - $90.00

Trail running Running

7.7K Half-Marathon 30K Marathon +4

Nov

14

ZombieRunner Quarry Lakes

Fremont, California, United States

Free - $70.00

Trail running Running

5K 10K Half-Marathon 3.2K +4

Nov

14

Catalina Island Half-Marathon & 10K

Avalon, California, United States

$25.00 - $150.00

Trail running Running

Half-Marathon 10K 1K

Nov

26

Zoom Turkey Trot

San Jose, California, United States

Free - $70.00

Trail running Running

5K 10K Half-Marathon 3.2K +4