California Triathlon Calendar 2025-2026

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Explore the best triathlons in California for 2025-2026! Our updated list features 852 exciting races across the region. Find your next race in California below and join the running community at these great events!

August 2026
Aug
22
Saturday

We Run Oakland: For Our Children

5 km
Aug
22-23
Sa - Su

Santa Rosa Marathon

5 km 10 km Half Marathon Marathon
Aug
23
Sunday

Splash Dash 5k

5 km
Aug
29-30
Sa - Su

Norcal Spartan Event Weekend

Obstacle Run 5 km 10 km
Aug
29
Saturday

Santa Barbara Triathlon & Beach Festival

Triathlon
Aug
30
Sunday

BRA Run - Los Angeles

5 km 13 km
September 2026
Sep
6
Sunday

Mount Shasta Tinman Triathlon

Triathlon
Sep
6
Sunday

Mammoth Bar Trail Runs

Trail Run 10 km Half Marathon
Sep
11
Friday

Mendocino Running Festival

Trail Run 10 km Half Marathon 6 hr 12 hr
Sep
12
Saturday

Emerald Bay Trail Run

Trail Run 7 mi
Sep
12
Saturday

She.is.beautiful Santa Barbara

5 km 10 km
Sep
12
Saturday

LSA's Run Home

5 km 10 km
Sep
19
Saturday

Gold Rush 10M Trail Run

Trail Run 5 km 10 mi
Sep
26-27
Sa - Su

Temecula Spartan Event Weekend

Obstacle Run 5 km 10 km
Sep
26
Saturday

Urban Cow Weekend

5 km Half Marathon
Sep
26
Saturday

Ascot Hills Challenge 5K

Trail Run 5 km
Sep
26
Saturday

Dick Collins Firetrails

Trail Run 30 km Marathon 50 mi 100 km
Sep
27
Sunday

Socal's Tiki Beach 5k & 10k Run/Walk

5 km 10 km
October 2026
Oct
3
Saturday

Signal Peak Trail Runs

Trail Run 24 mi 50 km
Oct
3
Saturday

Angeles Crest 100 Mile Endurance Run

Trail Run 100 mi
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