California
California Triathlon Calendar 2026-2027
Monthly updates for California
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in California for 2026-2027! Our updated list features 57 exciting races across the region. Find your next race in California below and join the running community at these great events!
September 2026
Triathlon and duathlon at Lake Siskiyou in Mt. Shasta with a 750 yard swim, 16.6 mile bike and 5K run; proceeds support the Dunsmuir Rotary backpack program.
A triathlon in Bear Valley, CA on Sep 6, 2026 with a 600 yd swim, 10.5 mile bike and 3.4 mile run. The bike uses three loops and the run one loop; wetsuits are allowed and water is provided on the run.
A multisport event at Liberty Station with swims in San Diego Bay, bike routes through Point Loma, waterfront runs including a separate San Diego 5K.
A gravel triathlon at Granite Beach, Folsom Lake with lake swims, off road gravel bike courses and trail running. Sprint and Olympic distances are USAT sanctioned and there is a non USAT SUP and kayak sprint option.
A full day in Lotus CA combining a supported point to point trail run with a professionally guided whitewater raft trip on the South Fork American River.
Monthly updates for California
Get new running races (and updates) in your inbox every month.
IRONMAN 70.3 Santa Cruz on September 13, 2026 includes a 1.2 mile ocean swim, a 56 mile bike on Highway 1 and a flat half marathon along coastal bluffs.
Experience a multisport challenge at Shaver Lake with triathlon, duathlon, and running events held at Camp Edison. Enjoy hilly bike routes and scenic trail runs followed by a tri tip lunch and finisher celebrations.
Experience a scenic multisport event at Crystal Cove State Beach featuring swim legs in the Pacific Ocean and a closed bike course on the Pacific Coast Highway. Choose from triathlon duathlon aquabike or trail run options.
A 12 hour team adventure race in Sausalito with paddling, mountain biking, trekking and map and compass navigation; boats are provided and teams choose their route.
Community Super Sprint triathlon in Albany, CA on September 20, 2026, with main and short courses at the Albany Aquatic Center and Memorial Park.
A reverse triathlon at Civic Center Park featuring a 5K run, 12 mile bike leg and 150 yard pool swim, plus a kids tri and a stand alone 5K.
Tri to Inspire is a short distance triathlon in Santa Rosa on 09/27/2026 featuring pool swims followed by bike and run courses. It offers sprint, mini sprint, relay and family divisions, with proceeds supporting the Inspiration Sports Foundation.
The Olympic course combines a 1500m rolling swim from Main Beach to Cowell Beach, a 40K bike along West Cliff Drive and Highway 1 to Davenport, and a 10K run that returns along West Cliff Drive and Swanton Boulevard. Transition rules are strict.
Sprint triathlon on September 27, 2026 featuring a 500 yards swim, a 12.5 miles bike leg and a 3 miles run with chip timing and a finisher medal.
October 2026
A weekend of Olympic-distance triathlon, an Olympic relay, a trail half marathon and a kids fun event at McNear’s Beach Park in San Rafael.
An annual multisport event at Mission Bay and Fiesta Island, the 2026 XTERRA Wetsuits Mission Bay Triathlon hosts USA Triathlon State Championships and offers triathlon, duathlon, aquabike, aquathlon, youth races, and a 5K, produced for Life Sports F..
Mudskipper US SoCal Silverwood takes place in Hesperia California on October 11 2026 and features open water swim and swimrun races presented by Canaqua Sports. It is the first Mudskipper event on the US west coast.
Annual triathlon in Davis hosted by UC Davis Triathlon Club with sprint, relay, and mixed team relay options at Schaal Aquatics Center.
IRONMAN California in Sacramento features a downriver 2.4 mile swim, a flat 112 mile bike through farmland and a 26.2 mile run finishing at the State Capitol.
A trail Run, Bike, Run at Lake Hodges near San Diego combining a 10k run, a 22k bike and a 5k run. Entries are available for individuals or teams; the event is cupless so participants should bring a personal hydration vessel.