South East (England)
Triathlon Calendar South East (England) 2026-2027
Monthly updates for South East (England)
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Explore the best triathlons in South East (England) for 2026-2027! Our updated list features 43 exciting races across the region. Find your next race in South East (England) below and join the running community at these great events!
September 2026
Multi-race aquathlon at Guildford Lido with swims in a 50 m outdoor pool and runs around Stoke Park, held in June, July and September 2026.
Triathlon at Moyles Court School with swims in Ellingham Waterski Lake, multiple race distances and an event village for spectators.
Small low entry triathlon at the Bridge Development in Dartford offering multiple multi lap race formats including a 1500m Stranded event and shorter GOTri and sprint races.
A seaside triathlon based at De La Warr Pavilion in Bexhill, featuring sea swim loops, countryside cycling and a pan flat 5 km promenade run. Multiple distance options are offered and all finishers receive a medal.
Multisport races at Dorney Lake near Windsor offering triathlon, duathlon, aquabike, aquathlon and open swim distances with chip timing and finisher medals.
Monthly updates for South East (England)
Get new running races (and updates) in your inbox every month.
A long established sprint triathlon in Newbury, Berkshire with a 300 m pool swim, a 22 km open road cycle and a 5 km canal run. Entries must be made in advance and close on 26 August 2026.
Brighton & Hove Triathlon and Multisport Festival on 6 September 2026 offers Super-Sprint, Sprint, Standard, children's TriStars and a mixed team relay along the seafront.
Midweek Aquathlon at DA1 5PR: 650 m open water swim in the south lake followed by a three lap 5.7 km run, field limited to 40 for water safety.
A map and compass adventure in the South Downs combining running, mountain biking and kayaking with solo and team options and flexible score-format courses.
Pool swim, fast bike loops and a lapped park run at Woking Leisure Centre offering junior and adult triathlon and aquathlon races.
A team relay triathlon at Southwater Country Park on 13 September 2026 featuring a 400m swim, 18km cycle and 3.8km run per athlete with wetsuits compulsory.
Tri Reigate at Buckland Park on 13 September 2026 offers sprint and standard triathlons around a lake and country lanes, supporting Macmillan Cancer Support.
Closed-road triathlon at Willen Lake with sprint and standard distances, open-water swims, traffic-free bike laps and a flat lakeside run in Milton Keynes.
Reading Triathlon on Sunday 13 September 2026 offers Sprint, Standard, Aquathlon, Aquabike and new Super Sprint races with open water swim and chip timing.
Multisport races at Henley Showground featuring triathlon, aquabike and open water swims on the River Thames with marked courses and on-site facilities.
A traffic free triathlon at Eton Dorney on 20 September 2026 offering super sprint, sprint and standard distances for individuals and three‑person teams, with chip timing, water safety cover and on‑site parking.
Triathlon event at Emberton Country Park on 20 September 2026 offering middle, standard and sprint distances plus relay and aquabike options with trophies and a 5% booking fee.
Women-only aquathlon at Shepperton Lake with lake swims and flat, supported runs; two distances offer 250m swim/2km run and 600m swim/6km run.
Triathlon at Dorney Lake on 26 September 2026 offering Super Sprint, Sprint and Standard distances with aquabike and relay options on a mainly flat, chip timed course.
Triathlon at Dorney Lake in Windsor with Super Sprint, Sprint, Standard, aquabike and relay options on a flat, chip timed course; British Triathlon licence required.