Cal Tri Newport Dunes

The 2025 Optimism Cal Tri Newport Dunes is a premier triathlon event taking place at the Newport Dunes Waterfront Resort & Marina. Celebrated as the longest-running triathlon in the world at the same location, this event features a variety of competitions, including Sprint and Olympic triathlons, RunBikeRun, SwimBike, and SwimRun events, catering to participants of all skill levels. With an expected registration of 1500-2000 athletes, the event promises a vibrant atmosphere.

The venue is conveniently located near attractions like Disneyland and Balboa Island, making it an ideal destination for both competitors and their families. Visit the organization's website for the most recent information.