California Triathlon Calendar 2025-2026

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Explore the best triathlons in California for 2025-2026! Our updated list features 743 exciting races across the region. Find your next race in California below and join the running community at these great events!

January 2026
Jan
1
Thursday

Brazen New Year's Day

Trail Run 5 km 10 km 13 mi
Jan
1
Thursday

Auburn Resolution Run

Trail Run 5 km 10 km 10 mi
Jan
3
Saturday

Hacienda Hills Trail Run - Winter

Trail Run 5 km 10 km ... 26 mi 50 km
Jan
3
Saturday

Lost Coast 55K

Trail Run 55 km
Jan
3
Saturday

Chase the Falling Stars Half Marathon

5 km 10 km 13 mi
Jan
4
Sunday

Grievances & Gratitude Run – Half Marathon

5 km 10 km 13 mi
Jan
10
Saturday

Resolution Run

5 km 10 km 13 mi
Jan
10
Saturday

Citrus Heritage Run

Jan
18
Sunday

Carlsbad Marathon

5 km 13 mi 16 mi 26 mi
Jan
24-25
Sa - Su

Socal Spartan Event Weekend

Obstacle Run 5 km 10 km 21 km
Jan
24
Saturday

La Cuesta Ranch Trail Run

Trail Run 10 km 20 km 30 km
Jan
24
Saturday

Folsom Lake Sweetwater Trail Run

Trail Run 5 km 10 km ... 26 mi 50 km
February 2026
Feb
1
Sunday

Surf City Marathon

5 km 13 mi 26 mi
Feb
7
Saturday

Mt. Umunhum Trail Conquest - Winter

Trail Run 5 km 7 mi ... 26 mi 50 km
Feb
14
Saturday

The Ranch 50K

Trail Run 13 mi 50 km
Feb
20
Friday

San Pasqual Valley Trail Race

Trail Run
Feb
21
Saturday

Fourmidable

Trail Run 13 km 13 mi 35 km 50 km
Feb
21
Saturday

Bob Long Memorial Mutt Run 5K

March 2026
Mar
1
Sunday

Screenland 5K

5 km
Mar
22
Sunday

Bakersfield Marathon

6 km 10 km 13 mi 26 mi
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