Swim on Friday, bike on Saturday, marathon on Sunday, all based in Tenby. Do one, do all three, or just watch.
Tenby hosts endurance racing twice a year, and this is the summer one. The format splits a long-distance triathlon across three days: an open-water swim from North Beach on the Friday evening, a long road bike stage through the county on the Saturday, and a marathon on the Sunday. You can enter a single day or the lot.
Watching the swim. The harbour and the walls above North Beach give you the whole thing, and a mass swim start in a walled harbour town at dusk is a better spectacle than it sounds. It is free and you do not need to be anywhere in particular.
Watching the bike. The route heads out into south Pembrokeshire lanes. Anywhere on a climb is good, because that is where the field spreads out and where the noise is.
Watching the run. The marathon laps the town and the South Beach end, which means you can sit outside a cafe and see the same runners repeatedly.
The honest bit. A summer weekend in Tenby is busy anyway, and the event adds athletes and their supporters to it, so parking in town is hard. Roads on the bike route were not closed in 2026 but they are busy with cyclists in groups — if you are driving in the county that Saturday, allow extra time and be patient on blind lanes.
The next editions are 2–4 July 2027 and 23–25 June 2028. For bases by event, parking and the 2026 closures, see where to stay for Long Course Weekend Wales.
A three-day endurance weekend based in Tenby: an open-water swim, a long road bike stage and a marathon, each on its own day, entered separately or as a set.
Tenby is busy that weekend, but road restrictions have been light (in 2026, none at all on the bike day). See where to stay for Long Course Weekend Wales.
Before you plan around this
Dates change every year — check with the organiser before you travel
We don't sell tickets and take no commission on any of these — links go straight to whoever runs it.
Accommodation books up around the bigger events — Tenby especially.
Tenby · Sleeps 4
Family-run boutique glamping on a headland inside the Pembrokeshire Coast National Park, with sea views along the coastline near Tenby.
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Set within a Grade II-listed building on the cusp of Tenby s iconic shoreline this delightful apartment is an idyllic base for a coastal adventure. Discover your surroundings on foot or by bike venturing along the coast path to bask in the views of St Catherine s Island or walkin
Bookable via holidaycottages.co.uk
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