California Triathlon Calendar 2025-2026

Oct

26

Sunday

Halloween Havoc Half Marathon - Fountain Valley, CA

Fountain Valley, California

5 km 10 km 13 mi

Oct

26

Sunday

Trick or Trot Half Marathon

Long Beach, California

5 km 10 km 13 mi

Oct

26

Sunday

Binational Race

San Diego, California

10 km 13 mi

Oct

26

Sunday

Monster Dash Half Marathon - Anaheim

Anaheim, California

5 km 10 km 15 km 13 mi

Oct

27

Monday

Alhambra Pumpkin Run

Alhambra, California

5 km 10 km

Oct

31

Friday

Machete Trail Madness 100 Miler

Perris, California

Trail Run 10 mi 50 mi 100 mi

Nov

1

Saturday

Thrive San Diego Half Marathon

San Diego, California

5 km 13 mi

Nov

1

Saturday

Beer City Half Marathon

Santa Ana, California

5 km 10 km 13 mi

Nov

1

Saturday

IPA 10K

Sebastopol, California

3 km 10 km 13 mi

Nov

1

Saturday

Día De Los Muertos 5k Race

Sacramento, California

5 km

Nov

1

Saturday

Ipa Half Marathon

Sebastopol, California

3 km 10 km 21 km

Nov

1

Saturday

Zombierunner Halloween

San Jose, California

Trail Run 5 km 10 km 13 mi 26 mi

Nov

1

Saturday

Almaden Hills Trail Run - Fall

San Jose, California

Trail Run 5 km 10 km ... 26 mi 50 km

Nov

1

Saturday

Rio Del Lago 100 Mile Endurance Run

Granite Bay, California

Trail Run 50 km 100 mi

Nov

1

Saturday

Joshua Tree Half Marathon

Joshua Tree, California

13 mi

Nov

1

Saturday

Wildwood Canyon Trail Run

Yucaipa, California

Trail Run

Nov

1

Saturday

The Best Races - Los Angeles

Los Angeles, California

5 km 10 km 13 mi

Nov

1

Saturday

Los Muertos 5K

Los Angeles, California

5 km

Nov

1

Saturday

Roosters Backyard Ultra

San Diego, California

Backyard Ultra

Nov

2

Sunday

Oakland Tech 5km Fundraiser Race

Piedmont, California

Trail Run 5 km