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Triathlon Calendar near Costa Mesa 2025-2026

Explore the top triathlons near Costa Mesa for 2025-2026! We've gathered 96 exciting races in the area. Check out our detailed list below to find your next local race.

March 2026
Mar
7
Saturday

Bayshore 70.4 Triathlon

Triathlon
Mar
7
Saturday

Lakewood Run

5 km 10 km
Mar
8
Sunday

Rodeo Run 10K

5 km 10 km
Mar
14
Saturday

Nine Trails 35 Mile Endurance Run

Trail Run 17 mi 35 mi
Mar
21
Saturday

Beer City Half Long Beach

5 km 10 km 13 mi
Mar
28-29
Sa - Su

Long Beach Half Marathon

5 km 10 km 13 mi
Mar
28
Saturday

Run Seal Beach

5 km 10 km
April 2026
Apr
4
Saturday

Billy Goat Mountain Climb

Trail Run 10 km 13 mi 17 mi
Apr
25
Saturday

Covina Fun Run

5 km
May 2026
May
2-3
Sa - Su

The Hoag OC Marathon

5 km 13 mi 26 mi
May
2
Saturday

SoCal's Cinco De Miles 5 Mile

5 km 5 mi
May
16
Saturday

O'Neill Park Trail Races

Trail Run 10 km 13 mi ... 26 mi 50 km
May
31
Sunday

Long Beach Classic Half Marathon

5 km 13 mi
June 2026
Jun
6
Saturday

Wrigley River Run

5 km 10 km 10 mi
November 2026
Nov
7
Saturday

Saddleback Marathon

Trail Run 10 km 13 mi 26 mi
Nov
26
Thursday

Plymouth Rock n Run

5 km 10 km
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