Wales
Triathlon Calendar Wales 2026-2027
Monthly updates for Wales
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in Wales for 2026-2027! Our updated list features 31 exciting races across the region. Find your next race in Wales below and join the running community at these great events!
September 2026
Seaside sprint triathlon on 11 September 2026 with a 750 m sea swim, 20 km bike and 5 km run along Saundersfoot and Wisemans Bridge amid large crowds.
Two day triathlon in the Brecon Beacons with a 2 mile seated SUP, 47 mile bike, 13 mile Pen y Fan hike and charity fundraising, limited to 30 places.
IRONMAN Wales in Tenby pairs a sunrise ocean swim at North Beach with a hilly bike along the Pembrokeshire coast and a crowd-filled town run.
A long-distance aquathlon in Aberdyfi combining a 13 km open-water swim with a 13 km coastal trail run, supported by drop-bag logistics and live GPS tracking.
Sea swim in Mumbles Bay, a hilly bike around the Gower Peninsula and a flat seafront run in Olympic and Sprint distances on 26 September 2026.
Monthly updates for Wales
Get new running races (and updates) in your inbox every month.
Sprint duathlon in Mumbles on 26 September 2026: single lap 5k run, 32k bike, 5k run with entry from £75 and GPX course files available.
Triathlon and duathlon at Newborough Forest and Traeth Llanddwyn Beach on 27 Sep 2026 with sea swims, mixed road and trail runs, and multiple distance options.
October 2026
A 400 m pool swim followed by a 5 km run on flat tarmac around Tonyrefail Park, held in October at Tonyrefail Leisure Centre.
Experience an end of season sprint triathlon in Porthcawl featuring a harbour swim, a multi lap town cycle, and a flat coastal run along the Bristol Channel.
March 2027
Sprint duathlon at Brunel Quay, Neyland: 5 km run, 21 km bike and 2.5 km run, British Triathlon permitted with relay options and a 200-place cap.
A duathlon at Margam Country Park combining trail runs around the castle and lake with rolling road bike courses featuring short climbs and fast flat sections.
April 2027
Sprint triathlon and aquathlon at Haverfordwest Leisure Centre on 11 April 2027 with a 400 m pool swim, 17 km bike, 5 km run and relay entry options.
A mixed trail and road duathlon at the National Botanic Garden of Wales with two 5 km runs and a 30 km road cycle loop through Carmarthenshire countryside.
May 2027
Sprint-distance triathlon in Llanelli with a 750 m open water swim, 26 km bike and 5 km run; includes relay entries and forms part of the Llanelli Multi-Sport Festival.
A two-day SUPBIKERUN at Fforest Fields combining paddle boarding, road cycling and trail running with chip timing, camping options and equipment hire.
Conquer the highest peak in Wales through a 36 km multi-activity adventure involving cycling, trekking, and kayaking in the heart of Snowdonia National Park.
Sprint triathlon in Swansea waterfront with a 750 m dock swim, a flat 20 km closed-road bike over three laps, and a 5 km run; entry from £84.99.
June 2027
Triathlon in Fishguard on 05 June 2027 offering three distances, a sheltered harbour swim, open road cycling and a coastal run.
Middle distance triathlon at Parc Bryn Bach with a 1.2 mile lake swim, 60 mile bike and 13.1 mile three-lap run, plus Aquabike and relay options.