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Triathlon Calendar near Brea 2025-2026

Explore the top triathlons near Brea for 2025-2026! We've gathered 152 exciting races in the area. Check out our detailed list below to find your next local race.

March 2026
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

Nurses Rock

5 km 10 km
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
23-24
Sa - Su

Nanny Goat

Trail Run 6 hr 12 hr 100 mi 24 hr
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
March 2027
Mar
1
Monday

Screenland 5K

5 km
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