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 33 exciting races across the region. Find your next race in Wales below and join the running community at these great events!
March 2027
Sprint duathlon at Brunel Quay, Neyland on 7 March 2027 featuring a 5 km run, 21 km bike and 2.5 km run; individual and relay entries, field capped at 200.
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 swim, 17 km bike and 5 km run; relay entries available.
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
Coastal to summit multi-discipline event from Abersoch Beach to Snowdon and back covering 115 km with swim, bike, mountain run and beach finish.
Monthly updates for Wales
Get new running races (and updates) in your inbox every month.
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 weekend event at Fforest Fields combining SUP workshops, road cycling and trail running with two distance options, paddleboard hire, camping and chip-timed results.
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 on Swansea waterfront with a 750m swim, 20km bike in three laps and a 5km run; entry from £84.99 on 23 May 2027.
June 2027
Triathlon in Fishguard with a sheltered harbour swim, country bike and coastal run on 05 June 2027; entries from £79.
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.
A middle distance triathlon at Parc Bryn Bach in the Brecon Beacons with a 1.2 mile swim, 60 mile bike and 13.1 mile run.
A lake-to-mountain triathlon in Llanberis with swim in Llyn Padarn, a climb up the Llanberis Pass and trail finishes through the Dinorwig slate quarries.
Abersoch Triathlon in North Wales features Olympic and Sprint courses with a sea swim, bike laps, a mixed beach trail road run and a beach finish.
Standard-distance coastal triathlon at Broad Haven with 1.5 km swim, 42 km bike and 10 km run; Aquabike and relay options, field capped at 400.
Pool based triathlon at Caldicot Leisure Centre on 26 June 2027 with an indoor swim, traffic free grass cycle circuit, multiple distances, relay and kids races.
A six-lap Eliminator Swimrun in Aberdyfi mixing running and open water swims around the Dyfi Biosphere, scheduled for 26 June 2027.
Coastal triathlon and duathlon in Llandudno on 27 June 2027 with sea swims by the pier, closed-road cycling on Marine Drive and a crowd-lined promenade run.
July 2027
IRONMAN 70.3 Swansea in Swansea Bay features a swim from Prince of Wales Dock, a flat coastal bike and a run through the city waterfront; relay entries available.
Swimrun on the Pembrokeshire coast with full and sprint options, solo or team entries, ENVOL endorsed, taking place on 24 July 2027.