California
California Triathlon Calendar 2025-2026
Explore the best triathlons in California for 2025-2026! Our updated list features 35 exciting races across the region. Find your next race in California below and join the running community at these great events!
August 2025
The Cupertino Splash and Dash is an exciting aquathon event featuring a 1.5 km swim followed by a 5 km run. Set in the scenic Stevens Creek Reservoir and surrounding park trails in Cupertino, CA, this..
Tri Santa Cruz is a vibrant and scenic triathlon event scheduled for August 10, 2025, in Santa Cruz, California. The event features a variety of competitions, including International and Sprint distan..
The Millerton Madness Triathlon, scheduled for August 24, 2025, in Friant, CA, features a variety of events including a Super Sprint Triathlon, a 5k Run, and a Relay Madness option. This USAT-sanction..
September 2025
The IRONMAN 70.3 Santa Cruz is a premier triathlon event set against the stunning backdrop of California's coastline. Athletes will experience a 1.2-mile ocean swim, a challenging 56-mile bike ride th..
The Shaver Lake Mile High Triathlon is a premier multisport event taking place in Shaver Lake, California. Scheduled for September 14, 2025, it features a variety of competitions including Sprint and..
October 2025
The Mermaid Triathlon & Duathlon Capitola 2025 is set to take place at Capitola Beach, California, featuring a variety of events including Sprint and Super Sprint Triathlons, Duathlons, Aquabike, and..
The Lake Evans Triathlon, 5k & 10k is a multi-sport event taking place at the Buena Vista Aquatic Recreation Area in Bakersfield, California. Scheduled for October 12, 2025, it features a variety of r..
The 2025 Cal Tri LA event, taking place in Playa Del Rey, California, features a variety of competitive races, including Sprint and Olympic triathlons, youth events, and unique formats like RunBikeRun..
The Kaiser Permanente IRONMAN California is a premier triathlon event held in Sacramento, featuring a fast and flat course ideal for athletes aiming for personal bests. Participants enjoy a downriver..
The Lake Hodges Off-Road Duathlon is an exciting running and biking event taking place on October 19, 2025, at the Piedras Pintadas Trailhead in San Diego, CA. Participants can compete individually or..
November 2025
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..
The Fall Classic Olympic Triathlon is set to take place in Long Beach, California, featuring a challenging course that includes a 1.5 km swim, a 40 km bike ride, and a 10 km run. Participants can expe..
December 2025
The IRONMAN 70.3 Indian Wells - La Quinta is a premier triathlon event held in La Quinta, California, near Palm Springs. This race features a scenic course that includes a swim in the calm waters of L..
The 39th Annual Tinsel Triathlon, taking place in Hemet, California, is a celebrated reverse sprint pool triathlon that caters to athletes of all levels. This event features various categories, includ..
Rudolphs Aquabike is an exciting end-of-season Super Sprint event taking place in Visalia, California. Participants can choose between an individual Aquabike or an Aquabike Relay, featuring a 400-yard..
