Join us for the Grafham Triathlon on Saturday 25th September 2027, brought to you by ATW, the largest triathlon organiser in the UK!

Whether you are an experienced athlete looking for a fast race, or a novice competitor looking for a safe and friendly venue for your first open water multisport event, Grafham Water is ideal. We guarantee you’ll enjoy this fantastic venue that has been used for award-winning triathlons, national championships and GB qualifier races.

We have two distances for you to tackle:

Standard Distance Triathlon - swim 1500m, cycle 38km, run 10km

Sprint Distance Triathlon - swim 750m, cycle 17km, run 5km

The swim takes place in the beautiful clean waters of the Grafham Water reservoir, with laps of a 750m loop. The Sprint race completes one lap, while the Standard completes two.

The bike is a flat out and back bike course that takes you through some of the most scenic villages in the area. The Sprint distance turns in the village of Perry, while the Standard turns in the town of St Neots.

The run uses laps of a 5k route around the natural footpaths of Grafham water. The flat route heads out and back across the iconic dam wall before looping past the finish and transition area where you’ll receive great support each lap. The Sprint will head in to the finish after one lap, while the Standard completes two laps.

Anyone who doesn't want to take part in the run, there is a standard distance Aquabike (swim-bike) option and for those who would like to compete as a team, there is a standard distance relay option, with or 2 or 3 individuals sharing the disciplines between them.

Want to hire a wetsuit for the season? We are proud to offer Zone3 wetsuits. Find out more HERE

Want to hire a wetsuit for a day, weekend or month? Find out more HERE

Stay Over?

You can now camp the night before the event! We are pleased to offer the option of camping through Lakeview Paddock. To veiw details click HERE

REASONS TO ENTER THIS EVENT

Scenic bike route, flat run course, well-marked course, supportive marshalls, custom designed medal, finish line goodies, Chip timed results & FREE event photos.

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Charity - Join us in making every stride count by raising money for our partner charity, Alzheimer's Research UK - your run will not only challenge your limits but also change lives, one step at a time, for a cure. Opportunities to donate and fundraise will appear at checkout.

ATW Transfer & Refund Policy

At ATW, we understand that sometimes plans change. While we do not offer refunds or transfers to another person, we provide a hassle-free event transfer option for those unable to attend their booked event. If you are unable to participate in your scheduled event for any reason—including injury, illness, pregnancy, bereavement, or other unforeseen circumstances—you can transfer your entry to any future ATW event. There is no proof required, we trust you!

Even better news, transfers can be made all the way up to 48 hours before your original event date.

ATW Community

At ATW we think of our participants as a community and we love to hear about the community's dreams and achievements.

If you'd like to share those dreams and achievements you can do so on any of our social media platforms. Equally if you'd like any advice about your upcoming event you will almost certainly find someone who can provide some guidance.

Links to all our social media platforms are at the bottom of the page, including to our ATW Chat Facebook group, which might be the most interactive platform if asking for help.

Event Organiser

ATW was established in 2011 by James Shipley. We have now become a national events company in the UK, specialising in Running, Triathlon, Duathlon, Aquathon, Cycling, Swimming and all permutation of swim-bike run events. With over 40,000 entries a year ATW has become a firm favourite amongst people who are determined to Dream, Believe and Achieve.

Description supplied by the event organiser.