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California Triathlon Calendar 2025-2026

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Explore the best triathlons in California for 2025-2026! Our updated list features 37 exciting races across the region. Find your next race in California below and join the running community at these great events!

December 2025
Dec
14
Su

Tinsel Triathlon

Triathlon
January 2026
Jan
3
Sa

The New Year's Duathlon

Duathlon
February 2026
Feb
14
Sa

Stanford Treeathlon

Triathlon
Feb
14
Sa

Stanford Draft Legal Triathlon

Triathlon
Feb
28
Sa

UWS Race on the Base

Triathlon
March 2026
Mar
7
Sa

Pasadena Triathlon

Triathlon
Mar
7
Sa

Bayshore 70.4 Triathlon

Triathlon
Mar
7
Sa

March Triathlon Series

Triathlon
Mar
14
Sa

The Rocky Hill Triathlon

Triathlon
Mar
28
Sa

Ironman 70.3 Oceanside

Triathlon
April 2026
Apr
12
Su

Cal Tri Lake Perris

Triathlon
Apr
12
Su

Millerton Lake Crows Nest Triathlon, 5k & 10k

Triathlon 5 km 10 km
Apr
26
Su

Grapes of Wrath Triathlon

Triathlon
May 2026
May
3
Su

Cal Tri Ventura

Triathlon
May
9
Sa

Folsom Lake International Triathlon

Triathlon
June 2026
Jun
20
Sa

Cal Tri Castaic Lake

Triathlon
Jun
27
Sa

XTERRA Tahoe City

Triathlon
Jun
28
Su

Cal Tri La Crema

Triathlon
July 2026
Jul
18-19
Sa - Su

San Clemente Ocean Festival

Multisport
Jul
18
Sa

Great American Triathlon

Triathlon