San Marcos
Triathlon Calendar near San Marcos 2026-2027
Monthly updates for San Marcos
Get new running races (and updates) in your inbox every month.
Explore the top triathlons near San Marcos for 2026-2027! We've gathered 6 exciting races in the area. Check out our detailed list below to find your next local race.
October 2026
Mission Bay in San Diego hosts multisport races on October 11, 2026, including the USAT State Championships across age group, high school, and club divisions.
Trail festival at Piedras Pintadas Trailhead in San Diego offering races from a 1 mile kids run to a 50K, plus a Run Bike Run trail duathlon.
Trail duathlon at Lake Hodges in San Diego featuring Run | Bike | Run over about 23 miles, open to individual and team entries with a cupless aid station policy.
April 2027
A half IRONMAN triathlon in Oceanside California with a sheltered harbor swim, a bike course through Camp Pendleton, and a run along the Pacific to a beach finish.
May 2027
Spring Sprint Triathlon in San Diego on May 2, 2027 features triathlon, duathlon, aquabike, a 5K and kids races with USAT sanctioning and event amenities.
Monthly updates for San Marcos
Get new running races (and updates) in your inbox every month.
June 2027
45th Annual San Diego International Triathlon on June 27, 2027 in downtown San Diego, offering swim-bike-run events, relays, aquabike, duathlon and a 5.6K run; beer garden benefits Father Joe's Villages.