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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.

September 2026
Sep
26-27
Sa - Su

Temecula Spartan Event Weekend

Obstacle Run 5 km 10 km
Sep
27
Sunday

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

5 km 10 km
October 2026
Oct
24
Saturday

Caspers Trail Races

Trail Run 10 km Half Marathon ... Marathon 50 km
November 2026
Nov
7
Saturday

Saddleback Marathon

Trail Run 10 km Half Marathon Marathon
Nov
26
Thursday

Plymouth Rock n Run

5 km 10 km
January 2030
Jan
1
Tuesday

Gemini Timing Demo

5 km
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