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Lough Cutra Castle Triathlon

Event details
  • . 120 days left to book
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The first of the year in the Castle Tri Series, the Lough Cutra Castle Triathlon is set to stun. With a variety of adult and junior distances on offer, everyone can get involved. Come for the epic routes, festival-like atmosphere, and all-around family fun.
C-19 Plan
Castle Triathlon Series has confirmed that this event will be going ahead as planned on Friday 28th May 2021 in accordance with the COVID-19 safety measures. Learn more

How to enter the Lough Cutra Castle Triathlon

  1. The Gauntlet

    Triathlon: Swim 1.9km, Bike 96km, Run 21km
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  2. Olympic

    Triathlon: Swim 1.5km, Bike 40km, Run 10km
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  3. Sprint Plus

    Triathlon: Swim 0.8km, Bike 40km, Run 8km
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  4. Sprint

    Triathlon: Swim 0.75km, Bike 20km, Run 5km
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  5. Super Sprint

    Triathlon: Swim 0.4km, Bike 20km, Run 4km
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  6. Starter Tri

    Triathlon: Swim 0.2km, Bike 13km, Run 2.5km
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  7. Adult Mixed Relay

    Triathlon: Swim 0.25km, Bike 5km, Run 1.5km
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  8. Junior Triathlon (13-14 years old)

    Triathlon: Swim 0.5km, Bike 8km, Run 2.5km
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  9. Junior Triathlon (15-17 years old)

    Triathlon: Swim 0.6km, Bike 13km, Run 3.5km
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  10. Junior Triathlon (11-12 years old)

    Triathlon: Swim 0.2km, Bike 4km, Run 1.6km
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  11. Junior Triathlon (8-10 years old)

    Triathlon: Swim 0.1km, Bike 4km, Run 0.8km
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  12. Duathlon - Sprint

    Duathlon: Run 5km, Bike 20km, Run 2.5km
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  13. Aquabike - Sprint

    Aquabike: Swim 0.75km, Bike 20km
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  14. Aquathlon Sprint

    Aquathlon: Swim 0.75km, Run 5km
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  15. Duathlon - Standard

    Duathlon: Run 10km, Bike 40km, Run 5km
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  16. Aquabike - Standard

    Aquathlon: Swim 1.5km, Run 40km
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  17. Aquabike - Standard

    Aquathlon: Swim 1.5km, Run 40km
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  18. 1 Mile Swim

    Swim 1mi
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  19. 2.5k Swim

    Swim 2.5km
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  20. 5k Swim

    Swim 5km
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  21. 10k Run

    Run 10km
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  22. Half Marathon

    Run 13.1mi
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  23. Marathon

    Run 26.2mi
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Lough Cutra Castle Triathlon routes

All of the races at Lough Cutra Castle kick-off with a stunning open-water swim in the lake, transitioning into a bike route which takes competitors through Lough Cutra itself.

The half iron Gauntlet cycle takes in the beautiful Burren national park. The event offers not only a chance to race but a festival atmosphere with live music, dancing, children’s entertainment, retailers, and food.

The countryside surrounding Lough Cutra Castle contains evidence of a history dating back to the Irish-Celtic mythology of the Tuatha Dé Danaan.

Old churches, cells and monasteries are prolific in the area, with some of the islands on the lake containing the remnants of stone altars.

Event Details

What’s Included
  • Official race photography
  • Finisher's medal
  • Prizes for winners
  • Live music and entertainment
Raceday Logistics


Please see the event website for more information.

The previous years start timings for the various Sprint events took place between 07:30 and 14:30. The Starter Tri, Children and Swim only events started between 15:00 and 17:00.

If Covid restrictions dictate, they shall follow a similar format at this Venue. If social distancing is not required, all adults events will take place in the morning and Children and Mixed Team Relay events after 14:00.

Entrants will be notified of their start time via email 2 weeks prior to the event. It is advised that entrants arrive at least 1 – 1.5 hours before their given wave time. Relays go off in the final wave of their distance.

Kit List

Bikes are available to hire with British Bike Hire at

Kit List

  • Transition box/bag
  • Wetsuit
  • Goggles
  • Towel
  • Cycling shoes & socks (If wearing)
  • Tri suit or shorts and t-shirt
  • Bike
  • Cycle helmet
  • Trainers (some routes require trail shoes)
  • Nutrition
  • Water Bottle
  • Race Belt
Junior Equipment
  • Wetsuit (all Castle Triathlon Series events are in open lakes so temperatures can get pretty cold)
  • Swimming goggles
  • Swim hat (all competitors get a free hat on the day of the events)
  • Bike (mountain bikes are ideal)
  • Helmet
  • Trainers
  • Elastic or lock laces – to tie up your trainers quickly
  • Tri-suit or shorts and t-shirt are fine

This event is free spectator entry. Bring the whole family along to enjoy the entertainment and support your family and friends.

Frequently Asked Questions

Can I hire a bike rather than trek mine to the Lough Cutra Castle Triathlon?
Absolutely, if you hire a bike with British Bike Hire, the bike will be at the event site waiting for you. Visit for more information.
Is it an open water swim at the Lough Cutra Castle Triathlon?
Yes, the swim will take part in the lake.
When will I be sent my start time for the Lough Cutra Castle Triathlon?
Participants will be emailed their start time approximately 2 weeks ahead of the event.

Meet the organiser

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Formed in 2009, the Castle Triathlon Series has swiftly established itself as the UK’s largest triathlon series. From Lough Cutra to Chantilly and Castles Howard, Cholmondeley and Hever, we’re immensely proud of the iconic backdrops to each Castle Triathlon Series race and the friendly festival atmosphere produced at every event.



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Tickets £23–£203

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  • Official booking partner
  • Best price guarantee
  • Free injury protection

Have a question? See our Help Center

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