Sunday, November 2

2025 Optimism Cal Tri Newport Dunes - 11.2.25

Experience the thrill and camaraderie at the 2025 Optimism Cal Tri Newport Dunes, the world's longest-running triathlon set to take place on November 2, 2025, in the scenic Newport Beach, Orange County. Choose from 12 exciting event options, including both Olympic and Sprint distances with unique race formats like Triathlon, RunBikeRun, SwimBike, and SwimRun. Whether you're a seasoned athlete or a beginner, there's a race tailored for you. Dive into the refreshing 65°F waters and compete against a backdrop of stunning coastal views. After the race, explore nearby attractions such as Disneyland Park and Balboa Island Ferry. Join us for a celebration of health, community, and the great outdoors - register now to be part of this historic event!