Hertfordshire
Triathlon Calendar near Hertfordshire 2026-2027
Monthly updates for Hertfordshire
Get new running races (and updates) in your inbox every month.
Explore the top triathlons near Hertfordshire for 2026-2027! We've gathered 42 exciting races in the area. Check out our detailed list below to find your next local race.
May 2027
Multisport event at Higginson Park in Marlow featuring triathlon, duathlon, aquabike, aquathlon and 750m 1500m 3000m open water swims with chip timed results and finisher medals.
June 2027
Midweek triathlon at Dorney Lake offering Super Sprint, Sprint, Standard, aquabike and relay options on a flat, chip timed course with wetsuit hire available.
Multi-distance triathlon at Dorney Lake with sprint, standard, super sprint, aquabike and relay options on a flat, Olympic-standard course.
July 2027
Five-distance triathlon at Hitchin Outdoor Pool and Butts Close, from children's Nano races to the Olympic distance, with timing, t-shirt and finisher medal included.
Monthly updates for Hertfordshire
Get new running races (and updates) in your inbox every month.
Midweek Dorney Triathlon at Dorney Lake offers sprint, super sprint, aquabike and relay options on a flat, chip timed course with wetsuit hire and free parking.
Triathlon at Higginson Park, Marlow on 11 July 2027 offering Middle, Olympic and Sprint distances with a Thames swim and chip timed results.
One on the River Marlow stages triathlon, duathlon, aquabike, aquathlon and open-water swims at Higginson Park beside the River Thames with chip timing and marked courses.
Triathlon at Riverside Park St Neots offering Sprint and Standard distances plus aquabike, relay options and on site camping.
Teams of three each complete a 750m swim, 23km bike and 5km run in relay format at Box End Park with categories and prizes for top teams.
Triathlon at Dorney Lake offering sprint, standard and super sprint distances plus aquabike and relay options on a flat chip timed Olympic course.
Point to point triathlon from Dorney Lake near Windsor to Brighton seafront with a 1.2 mile swim, c. 67 miles bike and c. 14 miles run.
Family oriented triathlon at Dorney Lake on 25 July 2027 with open water swims, flat traffic free bike routes and multiple junior and youth race distances.
Experience a flat and fast triathlon at the iconic Dorney Lake Olympic venue featuring super sprint sprint and standard distances plus relay and aquabike options.
August 2027
A multisport festival in St Neots on 7 August 2027 offering sprint to full triathlon distances, a 12 hour run, team relays, camping and family activities.
Bedford Triathlon on 15 August 2027 in Bedford Town Centre features Olympic and Sprint races with river swims, country bike routes and multi-lap riverside runs.
Multi-distance triathlon festival in London on 21-22 August 2027, featuring the 100 km T100 distance plus Olympic, Sprint and Super Sprint options.
SPRINT Superhero Tri is a short multisport challenge with a 150 m swim, 3 km bike and 1 km push/run. Entries can be solo, relay, or pulling a Superhero; everyone on course must be registered and receives a medal, T shirt and Super Kit Bag.
Beginner-friendly triathlon at Surrey Docks with open water swims, static cycling options and flat run routes, focused on community and representation rather than competition.
September 2027
One on the Lake Dorney on 5 September 2027 offers triathlon, duathlon, aquabike, aquathlon, open water swims and 5K, 10K and 15K runs with pro timing and medals.