Missouri
Missouri Triathlon Calendar 2025-2026
Monthly updates for Missouri
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in Missouri for 2025-2026! Our updated list features 14 exciting races across the region. Find your next race in Missouri below and join the running community at these great events!
December 2025
Embrace winter trails with the Stick Season Trail Run Series in Glencoe, Missouri. Five Saturday races from late December to late January cover 4 miles to a half marathon on mixed single track and road, with chip timing, great swag and series awards.
January 2026
Stick Season Trail Run Series offers five winter trail races in Glencoe Missouri, culminating in a half marathon through Rockwoods Reservation. Expect varied terrain, major climbs and cozy series swag for finishers.
Stick Season Trail Run Series offers five winter trail races in Glencoe Missouri, culminating in a half marathon through Rockwoods Reservation. Expect varied terrain, major climbs and cozy series swag for finishers.
Stick Season Trail Run Series offers five winter trail races in Glencoe Missouri, culminating in a half marathon through Rockwoods Reservation. Expect varied terrain, major climbs and cozy series swag for finishers.
Stick Season Trail Run Series offers five winter trail races in Glencoe Missouri, culminating in a half marathon through Rockwoods Reservation. Expect varied terrain, major climbs and cozy series swag for finishers.
May 2026
Take on the C26 Kansas City Triathlon on May 17 2026 with Olympic, sprint, duathlon and relay options. Flat closed road courses and strong race day support make this an ideal early season test for all levels.
June 2026
The Innsbrook Triathlon on Saturday June 6, 2026 in Wright City MO offers sprint and Olympic distances plus aquabike and relay options. Swim Lake Aspen then bike rolling hills and run a mixed gravel and pavement course.
Celebrate the 10th Great Escape Triathlon in Jefferson City on June 13 and 14, offering races for ages 5 to adult with a 50 meter pool swim and scenic bike and run past the historic Missouri State Penitentiary. All finishers receive medals and shirts..
Join the 39th annual ConcreteMan and ConcreteKids Triathlon in Rogersville on June 19 and 20 2026 for family friendly youth races and a full range of adult distances. New supersprint added and a course preview is set for May 28.
St. Louis Triathlon at Creve Coeur Park on June 28, 2026 features Sprint and Olympic races plus aquabike, duathlon, relays and a 6K. Enjoy a shirt, medal, live results and a post race festival while supporting Wounded Warrior Project.
July 2026
Tackle a fast, family friendly sprint triathlon in Ballwin with a 300 yard pool swim, 9 mile bike and 3.4 mile run. Options include relays, a buddy division and a Double Triathlon for athletes seeking an extra challenge.
Honor and support families while celebrating Matt Mason at the Cowboy UP Triathlon/Duathlon on July 26, 2026 at Smithville Lake. Choose tri, du, relay or virtual options and tackle scenic swim, bike and run courses for all levels.
August 2026
Race the 370 Lakeside Triathlon in St Peters on August 23 2026 with options from super sprint to half distance plus a 5K. A pre race open water clinic and relay, para, collegiate and high school divisions make this event welcoming to all.
September 2026
Conquer the rugged XTERRA Branson Mountain Man off road triathlon at Table Rock State Park, with swim, mountain bike and trail run on the White River Valley Trail. World Championship and youth slots reward top performances.