California
California Triathlon Calendar 2025-2026
Monthly updates for California
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Explore the best triathlons in California for 2025-2026! Our updated list features 38 exciting races across the region. Find your next race in California below and join the running community at these great events!
January 2026
Start the year at the New Year's Duathlon and 5K at Granite Beach, Folsom Lake, with scenic lake trails and a 2 mile run 5 mile bike 2 mile run or a gentle 5K. Enjoy aid stations, post race soup and cookies and support a local charity.
February 2026
Join the Stanford Treeathlon in San Mateo on Feb 14, 2026 for a 750 m open water swim, 20 km bike and 5 km run. Choose draft legal collegiate and elite racing or the Classic non draft event with waves for all genders and team relays.
Stanford Draft Legal Triathlon on Feb 14, 2026 in San Mateo offers a sprint course: 750 m swim, 20 km bike and 5 km run. Collegiate, elite and age group athletes welcome; registration opens Dec 2025 and draft legal spots require a code.
Race at Joint Forces Training Base in Los Alamitos on Feb 28, 2026, with a community 5K and an exciting reverse sprint triathlon. The triathlon starts with a 5K run, then a 13 mile bike and a 200 meter swim with solo and relay options.
March 2026
Celebrate the 20th Pasadena Triathlon & Angel 5k at the Rose Bowl on March 7, 2026 with triathlon, duathlon, reverse triathlon, kids races and a 5k fun run for all ages. The Angel 5k benefits Angel City Sports and welcomes adaptive athletes.
Take on the Bayshore 70.4 or a beginner friendly sprint in Long Beach with a calm Bay swim and scenic oceanfront course. Individual and relay entries, chip timing, finisher medal and post race food make this an ideal early season race.
Take on the March Triathlon Series at Lopez Lake in Arroyo Grande, with canyons and March greenery framing sprint and Olympic courses. USAT sanctioned and community focused, it also serves as the California Collegiate League championship.
Rocky Hill Triathlon in Exeter CA on March 14, 2026 offers short and long triathlon courses plus 5k and 10k races. Pool swims and valley to foothill bike and run routes deliver scenic views, challenging climbs and finisher swag.
Start your season at IRONMAN 70.3 Oceanside with a protected harbor swim, a scenic bike through Camp Pendleton, and a beachfront finish on The Strand. Coastal views and lively race day energy await.
April 2026
Join the 2026 Cal Tri at Lake Perris on April 12 for sprint and Olympic triathlons plus RunBikeRun, SwimBike, SwimRun and standalone swim and run options. Camping and RV spots available; youth ages 7 to 17 race free.
Race at scenic Millerton Lake on April 12, 2026 with triathlon, aquabike, duathlon and 5K and 10K run options for all levels. Limited to 200 participants for a friendly day of racing with medals, shirts and photos.
Dive into the Grapes of Wrath Triathlon, 5k & 10k at Lake Woollomes in Delano, CA on April 26, 2026. Choose from triathlon, duathlon, aquathlon, run or virtual options and enjoy scenic lake swims, flat bike routes and mixed trail runs.
May 2026
Dive into the 2026 Cal Tri Ventura on May 3 at Harbor Cove Beach in Ventura, CA, offering sprint and Olympic triathlon and multi sport formats across 12 options. Coastal course, free parking and race transfers make race day easy and fun.
Challenge yourself at the scenic Folsom Lake International Triathlon at Granite Beach with Olympic distance and Aquabike options, capped at 300 athletes. Enjoy custom TBF socks, a swim cap, a finisher hat, post race refreshments and age group awards.
June 2026
Join Cal Tri at scenic Castaic Lake on June 20, 2026 for open water swims and multisport fun. Pick from 18 options including Sprint and Olympic triathlons, Run Bike Run, SwimRun, swims, runs, and free youth races for ages 7 to 17.
XTERRA Tahoe City on June 27, 2026 delivers rugged off road triathlon and multisport action on the shores of Lake Tahoe. Swim in crystal clear water, tackle scenic singletrack bike trails and finish at Commons Beach for awards and atmosphere.
Join the 2026 Cal Tri La Crema in Guerneville, California on June 28 for scenic swims on the Russian River, rolling bike routes along River Road, and vineyard runs at La Crema Estate. Finish with a complimentary wine pour for athletes 21 and over.
July 2026
Enjoy the San Clemente Ocean Festival on the beach with athletic contests like a 5K run, 1 mile swim and Dory boat races, plus family favorites including a free concert, sand sculpting and youth activities. Perfect for athletes and families seeking s..
Join the Great American Triathlon, an annual no swim race along Sacramento's American River Parkway that blends running, biking and paddling into one exhilarating day. Perfect for racers and volunteers seeking a scenic summer challenge.
Take on the Crescent City Triathlon, a sprint with a pool swim, oceanfront bike and a run by Beach Front Park and the harbor in Crescent City California. Kid races and relays welcome for all abilities.