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 29 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: 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.
Monthly updates for Wales
Get new running races (and updates) in your inbox every month.
A two-day SUP, road cycling and trail running event at Fforest Fields offering SUP workshops, chip timing, on-site camping and two distance options.
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.
A city-centre sprint triathlon in Swansea with a 750 m dock swim, flat 20 km bike over three laps and a 5 km waterfront run.
June 2027
A coastal triathlon in Fishguard on 05 June 2027 offering Middle, Olympic and Sprint distances with a sheltered harbour swim and open road bike sections.
A middle distance triathlon at Parc Bryn Bach featuring a lake swim, a 60 mile bike through the Brecon moors and a three-lap 13.1 mile run; an aquabike option is available.
A multi-distance triathlon and duathlon in Llanberis with swims in Llyn Padarn, a bike climb up the Llanberis Pass and trail runs 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.
A coastal standard distance triathlon at Broad Haven with Aquabike and relay options, open water swimming, rural bike climbs and a coastal run.
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.
A multi-lap swimrun at Tal Y Llyn in Snowdonia with 5.2 km laps combining running and lake swims, up to 31.2 km total.
July 2027
IRONMAN 70.3 Swansea on July 11, 2027 combines a swim from Prince of Wales Dock, a coastal flat bike course and a run through Swansea city and the waterfront.
Open-water swim and coastal trail run along the Pembrokeshire Coast Path on 24 July 2027, with sprint and full distances and solo or team entries.