ATW Milton Keynes Closed-Road Triathlon at Willen Lake

The ATW Milton Keynes Triathlon is the UK’s newest closed-road triathlon event, taking place at the stunning Willen Lake in Milton Keynes. With a lake swim, a fast traffic-free bike course, and a flat scenic run around the lake, this event offers the perfect race experience for both beginner and experienced triathletes.

Located less than an hour from London, Birmingham and Oxford, the Milton Keynes Triathlon is easily accessible and ideal for athletes looking for a Sprint or Standard distance triathlon in the UK.

Whether you’re entering your first triathlon or chasing a personal best, the fast course and supportive race atmosphere make this an unforgettable event.

Race Location: Willen Lake, Milton Keynes

The race HQ is located at the beautiful Willen Lake, one of the most popular outdoor sporting venues in Buckinghamshire. The venue provides a perfect setting for triathlon with calm open water swimming, wide closed roads for cycling, and a scenic lakeside run route.

Milton Keynes is famous for its green spaces, extensive parkland, and of course its iconic Concrete Cows, making it a fantastic location for a triathlon event.

Triathlon Distances

The Milton Keynes Triathlon offers two race distances.

Sprint Triathlon from 7:30am

750m Open Water Swim

20km Closed-Road Bike

5km Run

Standard Distance Triathlon from 8:30am

1500m Open Water Swim

40km Closed-Road Bike

10km Run

The event offers the choice of a mass-start or a rolling swim start (depending on how competitive you are feeling) and follows a non-drafting race format.

Aquabike & Relay Options

If you don’t want to complete all three disciplines, there are additional race options available:

Sprint Aquabike (Swim + Bike)

Standard Aquabike (Swim + Bike)

Standard Distance Team Relay

These options make the Milton Keynes Triathlon accessible for athletes of all abilities and experience levels.

Why Enter the Milton Keynes Triathlon?

Beautiful Willen Lake race venue

Closed-road, traffic-free bike course

Fast, flat run route around the lake

Clearly marked race course

Friendly and supportive marshals

Professional event organisation

Finish line snacks and goodies

Custom designed finisher medal

A Triathlon for All Abilities

The ATW Milton Keynes Triathlon welcomes first-time triathletes, club athletes and elite competitors. The safe open water swim, fast bike course and flat run route make it one of the best beginner triathlons in the UK (with a generous cutoff of 5 hrs), while still offering a quick course for athletes chasing a personal best.

Enter the Milton Keynes Triathlon

Secure your place at one of the UK’s newest closed-road triathlon events and experience racing in one of the country’s most athlete-friendly cities.

Spaces are limited and are expected to sell out.

Purchase your 2026 event T-Shirt HERE

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 the day, weekend or month? Find out more HERE

Charity - Join us in making every stride count by raising money for our partner charity, Alzheimers 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 achievments.

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.