Triathlon Calendar United Kingdom 2026-2027
Monthly updates for United Kingdom
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in United Kingdom for 2026-2027! Our updated list features 227 exciting races across the country. Find your next race in United Kingdom below and join the running community at these great events! Search for a location or view races near London, Birmingham, Glasgow, Liverpool, Scotland or Wales.
September 2026
Triathlon at Dorney Lake supporting Macmillan Cancer Support with Super Sprint, Sprint, Standard, aquabike and relay options at the Olympic venue; event sold out.
Triathlon at Dorney Lake with sprint, standard, super sprint, aquabike and relay options on a flat, chip timed Olympic venue.
ATW Grafham Triathlon at Grafham Water features sprint and standard formats with open water swim loops, a flat out and back bike and a 5 km lap run around the dam. Aquabike and relay options plus wetsuit hire and overnight options are available.
Mumbles Triathlon on 26 September 2026 features a sea swim in Mumbles Bay, hilly bike routes on the Gower Peninsula and a flat seafront run with Olympic and Sprint options.
Hever Castle Multisport Weekend offers triathlon, duathlon, aquabike, swim and run events across a range of distances in the historic Kent castle grounds.
Monthly updates for United Kingdom
Get new running races (and updates) in your inbox every month.
Sprint duathlon in Mumbles on 26 September 2026 featuring a 5k run, 32k bike and 5k run with entry from £75.
A swimrun eliminator at Princes Dock in Liverpool with up to six knockout laps and a 15 km maximum distance. Gender-specific lap formats and timed cutoffs shape progressive eliminations on a course of short runs and swims.
A multi-sport event in the Cuilcagh Lakelands Geopark combining cycling, trail running and kayaking with long (approx 74Kms) and short (approx 35Kms) course options.
Aquathlon at London Fields Lido combining a 400 m pool swim with a 5 km loop around London Fields Common, listed in the Senior London League.
Sprint triathlon and aquathlon in Argyll with a 20 m pool swim, flat canal run and cycling past a nature reserve and historic Dunadd hill fort.
Crowle Triathlon on 27 September 2026 at Axholme Leisure Centre features sprint, super sprint relay and aquabike options, with medals awarded to all finishers.
Duathlon at the House of Dun on 27 September 2026 featuring off road runs, a 25.8 km bike on quiet country roads and a 120 participant limit.
Timed solo swimrun at Grafham Water with repeated 2.5 km laps, two swims and three runs per lap, decreasing time limits and up to 12 laps totaling 30 km.
Sprint triathlon and duathlon at Poynton Leisure Centre on 27 September 2026 with chip timing and British Triathlon licensing.
A late-season triathlon at East Leake Leisure Centre on 27 September 2026 offering sprint and super sprint formats, pool swims, on-road cycling and mixed-surface runs.
Beach start triathlon and duathlon in Newborough Forest, Anglesey with sea swims, mixed road and trail courses across several distances on 27 Sep 2026.
Two-part run and swim biathlon in Evesham on 27 September 2026 with 12 age-based classes, individual or duo entries and points-based scoring across set distances.
A biannual pool then run aquathlon at the Lakeside Centre in Killingworth with junior and adult categories, seeded swim starts for adults, and trophies across age groups. Race pass rules apply for nonmembers.
Non-drafting sprint duathlon at Nissan Test Track featuring a 5 km run, 20 km bike and 1.7 km run on a traffic-free closed circuit.
Sprint and Super Sprint triathlons at Hampton Pool feature pool swims in a 26°C lido, road cycling and runs beside Hampton Court with safety measures for open roads.