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 308 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.
May 2027
Triathlon at Marazion Beach with a sea swim by St Michael's Mount, flat bike lanes and a sea-front run, offering distances from Super Sprint to the 70.3 middle distance.
Multisport event at Lake 62 in the Cotswolds offering triathlon, duathlon, swim and a family fun run, with camping and payment plans available.
Aquathlon at Lake 62 in Ashton Keynes with lake swims and several youth distances plus a 1.5 km family fun run.
Triathlon at Higginson Park on 30 May 2027 with Middle Distance, Olympic and Sprint races, a Thames swim and road bike and run courses.
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.
Monthly updates for United Kingdom
Get new running races (and updates) in your inbox every month.
A sprint triathlon at Westonbirt House on 31 May 2027 featuring a 400 m pool swim, 23 km bike past the Arboretum and a 5 km traffic-free run.
June 2027
Midweek triathlon at Dorney Lake with Super Sprint, Sprint, aquabike and relay options on a flat course in an Olympic venue; British Triathlon membership is required.
Triathlon at Blenheim Palace on 5–6 June 2027 with SuperSprint and Sprint distances, a lake swim, closed road bike course and a finish line festival.
Triathlon in Fishguard with a sheltered harbour swim, country bike and coastal run on 05 June 2027; entries from £79.
Open water swim festival at Loch Ore with five triathlon-based swim distances and two sanctioned aquathlons.
Swim then run races at the heated Cheltenham Lido with Sprint, Standard and a new Long distance, held on pool and mixed-surface running routes while raising funds for the lido.
Seven-day Monster Triathlon from Fort Augustus (Loch Ness) to London with a 5 km swim, five days of cycling and a 50 km ultra-marathon, 6 to 12 June 2027.
A well-established Weymouth triathlon on 6 June 2027 offering Sprint and Classic distances, sea swim with safety cover, chip timing, marshalled routes and a race HQ at Weymouth College.
IRONMAN 70.3 Bolton is a triathlon in Bolton, UK featuring a swim at Pennington Flash, a bike through local villages and a run around Bolton town centre and Queen's Park.
A middle distance triathlon at Grafham Water featuring a 1.9 km swim, 90 km bike and 21 km run, with non-drafting bike rules and aquabike and relay options.
Pool based triathlon in Henley with countryside cycling, a grass run at Gillotts School, multiple distances, relay options and a charity CRUK wave.
Sprint triathlon and junior aquathlon at Dover Leisure Centre on 6 June 2027, with a 400 m pool swim, 14 km bike and 5 km run plus age-group junior races.
Lap-based swimrun at Tal Y Llyn combining tarmac running and open-water swims, with laps of 5.2 km and up to 31.2 km total in the Cadair Idris area.
Triathlon at Mount Edgcumbe on 6 June 2027 with Middle, Standard, Sprint and swim races, camping, ferry access and timed results.
Coventry Triathlon at XCEL Leisure Centre features a 400 m pool swim, 19.0 km bike and 5 km run, with relay and aquabike options and a required British Triathlon membership or race pass.