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Triathlon Calendar near Lake Forest 2025-2026

Explore the top triathlons near Lake Forest for 2025-2026! We've gathered 106 exciting races in the area. Check out our detailed list below to find your next local race.

April 2026
Apr
4
Saturday

The Rabbit Run 5k

5 km
Apr
5
Sunday

ABWR Half Marathon - Belmont Shore

5 km 10 km 15 km Half Marathon
Apr
12
Sunday

Cal Tri Lake Perris

Triathlon
Apr
17-18
Fr - Sa

Run4Kids Ultra Running Party

Backyard Ultra Half Marathon Marathon ... 100 mi 24 hr
Apr
18
Saturday

Run for the Planet – Half Marathon

5 km 10 km Half Marathon
Apr
19
Sunday

ABWR Half Marathon - Belmont Shore

5 km 10 km 15 km Half Marathon
Apr
25
Saturday

SoCal Redwood Race

Backyard Ultra 3 hr 6 hr 12 hr
Apr
25
Saturday

Running Is For The Birds

5 km 10 km
Apr
25
Saturday

Orange County Superhero 5K

5 km
May 2026
May
2-3
Sa - Su

The Hoag OC Marathon

5 km Half Marathon Marathon
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 Half Marathon ... Marathon 50 km
May
23-24
Sa - Su

Nanny Goat

Trail Run 6 hr 12 hr 100 mi 24 hr
May
25
Monday

Laguna Hills Memorial Day Half Marathon

3 mi 6 mi 13 mi
June 2026
Jun
20
Saturday

SoCal's Pirate's Run

5 km 10 km
July 2026
Jul
4
Saturday

IRVINE 4th of July-Red, White, & Blue 5k

5 km
Jul
4
Saturday

Freedom Run on the Ranch

5 km 10 km
Jul
18-19
Sa - Su

San Clemente Ocean Festival

Multisport
Jul
18
Saturday

Harding Hustle

Trail Run 15 km 30 km 50 km
August 2026
Aug
23
Sunday

Splash Dash 5k

5 km
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