Trail running Race Calendar in California, United States

Mammoth Bar Trail Runs

Auburn, California, United States

06 Sep, 2026 (Sun)

Trail running

Half-Marathon 10K

Diablo Trail Run

Clayton, California, United States

06 Sep, 2026 (Sun)

Free - $90.00

Trail running, Running

6.4K 16.1K Half-Marathon Marathon +2

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

Santa Venetia, California, United States

11 Sep, 2026 (Fri) – 14 Sep, 2026

$45.00 - $95.00

Running, Trail running

5K 10K Half-Marathon +2

Los Angeles Sunset Relays | 5K & Kid Run

Los Angeles, California, United States

12 Sep, 2026 (Sat)

$14.50 - $200.00

Running, Trail running

16.1K 5K 1.6K 4K +1

JP's Backyard Ultra/Hike, The Final Edition

Napa, California, United States

26 Sep, 2026 (Sat)

Free

Trail running

Ultra

Cirque Series - Mt Baldy, CA

Mt Baldy, California, United States

03 Oct, 2026 (Sat)

$92.45

Trail running

14.6K

Saddle2Surf

Norco, California, United States

04 Oct, 2026 (Sun)

$75.00 - $150.00

Trail running

Ultra

Ruth Anderson Memorial Endurance Run

San Francisco, California, United States

10 Oct, 2026 (Sat)

Free

Trail running, Running

Ultra 7.2K

Ridge Creek Run Club 12 Hour Ultra

Dinuba, California, United States

10 Oct, 2026 (Sat)

$75.00

Trail running

12 Hour Ultra Lap Run

Bizz Johnson

Susanville, California, United States

11 Oct, 2026 (Sun)

$65.00 - $100.00

Running

Ultra Half-Marathon 10K

The Jackalope Lope

Redding, California, United States

17 Oct, 2026 (Sat)

$65.00 - $90.00

Trail running

13.7K 33K Ultra

Lake Hodges Trail Festival

San Diego, California, United States

17 Oct, 2026 (Sat) – 18 Oct, 2026

$15.00 - $130.00

Trail running, Running, Duathlon

50K 25.1K 15K 10.3K +7