Cal Tri Newport Dunes

The 2025 Optimism Cal Tri Newport Dunes, held at Newport Dunes Waterfront Resort & Marina in Newport Beach, California, is the longest-running triathlon at the same location since 1978. This event serves as the Cal Tri Events National Championship, attracting 1,500 to 2,000 participants. It offers 12 race options including six Olympic distance events (triathlon, run-bike-run, swim-bike, swim-run, 1640-yard swim, and 10K run) and six sprint distance events (triathlon, run-bike-run, swim-bike, swim-run, 400-yard swim, and 5K run).

The course features wetsuit-legal water averaging 65°F and mild air temperatures. The race is beginner-friendly and conveniently located near John Wayne Airport and local attractions like Disneyland and Balboa Island. Visit the organization's website for the most recent information.