The Series

Lough Cutra Castle Triathlon

Arguably the finest castle in the series, Lough Cutra Castle provides a fitting backdrop for the curtain raiser of the Castle Triathlon Series.

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Lough Cutra Castle Triathlon

Saturday 29th and Sunday 30th May 2021

Our first race of the season sets the scene for a competitive and fun series, hosted within the beautiful grounds and surrounding area of stunning South Galway. What’s more, the race coincides with a Bank Holiday in the UK and it is also the first weekend of the UK school half term, making it an ideal break for sporty families.

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 circumnavigates 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.

Lough Cutra Castle Triathlon

About Lough Cutra Castle

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.

The history of the actual estate can be traced back as far as 866 A.D. when the ruined church of Beagh was sacked by the Danes and war raged through the district for nearly 1,000 years.

The Castle itself was built during the Gothic revival period and is idyllically situated overlooking the Estate’s 1,000 acre lake (the largest privately owned lake in Europe), home to the open-water swim of the Lough Cutra Castle Triathlon.

Socially Distanced Event Format

A safe way to continue racing together!

We organised a hugely successful socially distance event at Hever Castle in September 2020 for over 4000 participants and their supporters. This has given not only us, the Industry but most importantly our participants, the confidence to return to racing in 202!.

We want to reassure all participants that we’ll continue to work closely with governments, governing bodies, venues and suppliers to ensure that our 2021 events are run in accordance with current health and safety guidance.

Our increased health and safety measures cover 5 key principles of education; touch point reduction, density reduction, athlete self-reliance and enhanced hygiene.

Should we be require to put on a socially distanced event, participants will still get the full race experience but with individual rolling starts, 1 competitor every 10 seconds (sometimes greater), restricted time on site either side of your race and possible limit on spectators per athlete only.

We will prepare venue specific documents to send to all participants ahead of the event. These will include details on how to prepare pre-event, arrival timings and movements, swim, cycle, run, festival village and exit.

Standard Distance BMW National Series

Sunday 30th May 2021

This course is open to be enjoyed by both National Series and non-National Series participants!

Earn early National Series points on this truly iconic course in the West of Ireland.  Swim 1500m in the iridescent waters of Lough Cutra Castle (the largest privately owned lake in Europe), cycle 40K in the foothills of the Burren National Park on a super fast course before taking off onto the 10K run around the manicured grounds of the castle itself.


2021 Aquabike Standard National Championship

Sunday 30th May 2021

This stunning course, to be enjoyed by both championship and non-championship participants, sets you up for a great season ahead. Swim the iridescent waters of Lough Cutra Castle (the largest privately owned lake in Europe) and then cycle 40K in the foothills of the Burren National Park on a super fast course. Finish down the main driveway and cross the line in front of arguably the grandest castle in the West of Ireland.

Mixed Team Relay

Saturday 29th May 2021

This race format, taking place on Saturday afternoon, will see four person teams; two males and two females, each completing a 250m swim, 5km bike and 1.5km run as part of a tag team. (STRICTLY TO TT BIKES)

Mixed Relay has proven extremely popular with athletes of all standards and allows regular age groupers and more advanced athletes to race together. The minimum age requirement for athletes is 15 years. There is no upper limit upper age limit or ability for those taking part.

We are delighted to have hosted the National Mixed Team Relay Club Championships for the last three years running and have been awarded the pleasure again for  2021. The race will be run to ITU standards and all participants must hold a full TI Licence and team members must belong to the same club.


Go long for the Gauntlet

Sunday 30th May 2021

In 2021 Lough Cutra Castle, for the seventh year running will see The Gauntlet, a middle-distance race, push competitors to their limit via stunning 1.9km swim, 96km bike ride and 21km run.

This race distance had a hugely successful launch across the Series in 2014 with over 1000 sign ups. Since then it has gone from strength to iron strength doubling in size with hardened triathletes and newcomers to the triathlon side-by-side on the start line. In 2016 we were proud to host the Gauntlet as part of the Triathlon Ireland Vodafone National Series and in 2017 the Gauntlet offered 5 qualifying places in each Age Group for the 2018 ETU European Middle Distance Championships. 

10K, Half Marathon and Marathon

Sunday 30th May 2021

Building on the success of the Castle Run Series introduction in 2018, with the Marathon, Half Marathon and 10k will continue to take place at Lough Cutra Castle.

This stunning and unique multi-terrain course will incorporate spectator friendly loops of beautiful countryside, the Castle lake, quaint local villages and of course Lough Cutra Castle itself. Each runner will receive a medal and will be welcomed across the finish line with a banquet of well-earned treats, with live bands, food stalls, a retail area and camping at the castle making the weekend a festival of sporting achievements.

Multisport Distances

Duathlon, Aquabike, Aquathlon (Standard and Sprint)

If the thought of completing all three disciplines at once is holding you back from signing up to one of our events, our multisport distances could be perfect for you! Perhaps an injury is preventing you from running, you can’t get your hands on a bike for this summer or the idea of swimming in the lake is just too much. We have created the multisport events to allow our competitors to compete in two disciplines of your choice within our triathlons. The same stunning courses tailored to suit you!

Castle Swim Series

Saturday 29th May 2021

The swim only event provides the choice of three different distances: 5km 2.5km and 1mile (see price table below) and boasts a unique and stunning swim route in all the stunning castle lakes.

The swim described by many triathletes as the ‘best open water swim ever completed’ will now be open to outdoor swimmers as an event in its own right.

One mile leisure and family swim

Enjoy the beautiful setting of Lough Cutra Castle  at your own pace. Swim any stroke you like (breaststroke encouraged), swim and chat with friends as you go around. Don’t worry about how long it takes (however time limit set at 90 minutes), just enjoy it. Under 16s welcome if accompanied throughout by a competent responsible adult, however we do have a minimum age of 13.

I have previously done Castle Series Triathlons but not standard distance, this year I did Ireland, I loved it! There was fog which affected the Gauntlet races prior to my race and they had to delay but my race went ahead later than planned and it was awesome. Safety first, at 8am you couldn’t even see the buoys in the lake! The lake was cleanish compared to others! The roads were brilliant for the cycle and the run route was varied. I love the castle series, the organiser Brian is fab, will help anyone out if he can! The support team is ace, the will do anything to help anyone out as well. Thanks again.
Dawn Malloy

Distances, Timings, Pricing

To compete in the Lough Cutra Castle Triathlon you can enter either as an individual, a relay team of two, or a relay team of three. The Junior and Children’s races follow the same format. Relay entries can be all male, all female or mixed.

Saturday 29th May 2021

Race Name
Race Distance
(Individual / Relay)
Black Friday Prices
(Individual / Relay)
Start time
Sprint Plus - The Prendergast
800m / 40km / 8km
£95 / 140
£62 / 91
Sprint - The Lady Gregory
750m / 20km / 5km
£90 / 135
£59 / 88
Super Sprint - The Viscount Gough
400m / 20km / 4km
£85 / 130
£55 / 85
Starter Tri - The Castle
200m / 13km / 2.5km
£70 / 110
£46 / 72
5km Swim
2.5km Swim
1 Mile Swim
1 Mile
Aquabike Sprint (Swim / Bike)
750m / 20km
Aquathlon Sprint (Swim / Run)
750m / 5km
Duathlon Sprint (Run / Bike / Run)
5km / 20km / 2.5km
Junior (13-15 yrs) - The Teal
300m / 5km /2.4km
£44 / 55
£29 / 36
Mixed Relay
250m / 5km / 1.5km**
£120 (team)
£78 (team)
Family mixed relay
250m / 5km / 1.5km**
£75 (team)
£49 (team)

*We organised a socially distance event in 2020 for over 4000 participants at Hever Castle. The start timings for 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 needs be, we shall follow a similar format at Lough Cutra. 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.  We advise that entrants arrive at least 1 – 1.5 hours before their given wave time.  Relays go off in the final wave of their distance.

Sunday 30th May 2021

Race Name
Race Distance
(Individual / Relay)
Black Friday Prices
(Individual / Relay)
Start time
Half Iron / Middle Distance - The Gauntlet
1.9km / 96km / 21km
£220 / 270
£143 / 176
Olympic / Standard - The Lough Cutra
1.5km / 40km / 10km
£110 / 150
£72 / 98
42.2 km
HALF Marathon
21.1 km
10 km
Aquabike Standard (Swim / Bike)
1500m / 40km
Aquathlon Standard (Swim / Run)
1500m / 10km
Duathlon Standard (Run / Bike / Run)
10km / 40km / 5km
Children (11-12 yrs) - The Cormorant
200m / 4km / 1.6km
£39 / 55
£25 / 36
Children (8-10 yrs) - The Widgeon
100m / 4km / 0.8km
£33 / 55
£21 / 36

*We organised a socially distance event in 2020 for over 4000 participants at Hever Castle. The start timings for the Gauntlet and various Standard events took place between 07:30 and 14:30. The Children and Run only events started between 15:00 and 17:00 (Marathon began at 09:30). If needs be, we shall follow a similar format at Lough Cutra. If social distancing is not required, all adults events will take place in the morning and Children 14:00.

**Distance vary slightly at each venue

Entrants will be notified of their wave time via email 2 weeks prior to the event. We advise that entrants arrive at least 1 – 1.5 hours before their wave time. There’s an option to request specific waves during registration. Relays go off in the final wave of their distance.


Find the 2019  Races Results here.

If you have any queries please contact Stuweb Timing Solutions here.

Useful information

Race licences and certificates

For another year the Lough Cutra Castle Triathlon will be a Triathlon Ireland Assured Sanctioned Race.

As such we will be receiving assistance from Triathlon Ireland technical officials on the day and in the run up to the event.

On race day, ALL participants of a multi-discipline event are required to present their valid triathlon governing body (eg TI, BTF, FFT) membership card or One Day Licence. This ‘ODL’ must be purchased before the event from the TI website


Triathlon Ireland
Competitor Photography

PRE-Race day offer! AWOL Adventure photography team will be positioned around the course, finish line, and event village ready to capture that timeless photo – Just don’t forget to SMILE!

Pre-order your digital bundle of pictures for a special HALF PRICE DISCOUNT. Here’s how it works…..

ALL your Digital Photos for for half price
Min. 2 photos GUARANTEED or your money back*
Bundle goes to full price after the event so hurry!

*Click here for quick FAQ and details of Awol Adventure guarantee

Spectator Offering

The spectator experience at the Castle Triathlon Series has become almost as famous as the spectacular backdrops and classic courses, and has made passing time before your loved ones finish the race a thing of the past.

Rules and Terms and Conditions

Please read and understand the general rules, in particular the cut-off times, before competing to ensure a fantastic race for you and everyone else.

Travel, accommodation and directions to the venue

Click the link below to find out everything you need to know about all of our venues.

Trophies, prize money and medals

All competitors in all races will receive a medal on completion of their race.

Each 1st place winner will also receive a suitably themed trophy, and sponsor’s prizes for 2nd and 3rd place. There is a significant prize pot on offer for the Olympic and Gauntlet race distances.

Click below to find out more about what we have on offer.

Water quality and temperature

The water quality tests are taken regularly for Lough Cutra Castle’s lake. All tests are undertaken using the EU Water Bathing Directive as the benchmark.

Water temperature

For swim length up to 1500m wetsuits will be optional on race day if the temp remains between 14 and 22 degrees centigrade and over 1500m swim length wetsuits will be options between 15 and 23 degrees centigrade.

Useful downloads:

Race distances

Race distances

For the absolute beginners and children to the professional triathletes, the Castle Triathlon Series offers a wealth of race distances to suit all levels.

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Hosted at a selection of stunning and iconic castles across the UK, Ireland and France, the Castle Triathlon Series events all promise an inspirational and memorable race experience.

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Take part

We pride ourselves on offering a bespoke and tailored offering for all those wishing to take part; from first timers, old timers, juniors, female focus, elites, tri clubs, corporates, there’s a race for everyone!

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Trade your time for a free race place! We offer a Volunteer Scheme, whereby a free race is given in return for a day’s marshalling at any one of the Castle Triathlon Series events. (terms apply)

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