Dublin City Triathlon

The Dublin City Triathlon is Ireland's largest city-centre triathlon — held on 22 August 2026 in the Phoenix Park, the heart of Dublin. Part of the Triathlon Ireland National Series, the 2026 edition offers Sprint, Try-a-Tri, and Aquabike distances (note: no standard/Olympic distance in 2026). Organised by Piranha Triathlon Club and sponsored by RDJ, it's one of the best-attended and best-supported races in the country.

The swim takes place in the Furze Pond within Phoenix Park — a controlled freshwater environment that feels safe and manageable. The bike course uses the closed roads of the park — flat, fast, and wide. The run loops through the park's avenues and open grassland. The entire race takes place within the park, which means spectators can see multiple stages without moving far. The atmosphere is Dublin at its best: big entry fields, enthusiastic marshals, and a buzzing finish area. Piranha Triathlon Club has a strong reputation for event organisation. The Try-a-Tri option makes this one of the best first-triathlon experiences in the country — short distances, a safe swim venue, and a massive crowd cheering you home.

Registration opened 1 March 2026 through the Triathlon Ireland website. An early bird discount code (DCT05) was offered for initial registrants. Triathlon Ireland licence or ODM required. The event is popular and fills up — register early for the best pricing and to guarantee your place.

Phoenix Park, Dublin — Europe's largest enclosed urban park. Accessible from the M50 via the Chapelizod Gate or from Dublin city centre via Parkgate Street. Free parking within the park (some areas closed on race day — arrive early). Dublin Bus and the Luas Red Line (Heuston Station, 10-min walk) serve the area. Accommodation is not needed for most Dublin-based participants; visitors can stay anywhere in the city.

The Dublin City Triathlon is the biggest urban tri in Ireland. The Duathlon National Championships (April) use the same Phoenix Park venue. The Westport Triathlon (August) is the nearest National Series event a week earlier. For beginners who enjoy the Try-a-Tri, the Lough Cutra Castle Starter triathlon (May) and TriAthy Try (May) are natural follow-ups earlier in the season.