ATW is the largest triathlon organiser in the UK and we are proud to bring you the Mallory Park Children's Open-Water Triathlon!
This traffic-free race circuit with its own self-enclosed swim lake is the UK's No1 venue for triathlon competition.

It doesn’t matter if your child is the next budding Alex Yee or Georgia Taylor-Brown, or this is their very first attempt at a triathlon… this is an ideal event for them.

This is an opportunity for your child to race in the only venue in the UK where they can safely compete in an open-water swim and cycle on a traffic-free, tarmac race course.

The swim will be a single lap of the lake that fills the interior of the racetrack.
The transition will be in the hard-standing paddock area.
The bike will use a 2km anticlockwise lap of the super-fast bike circuit (Tristart uses a shorter lap)
The race finishes with laps of a 600m flat tarmac out-and-back loop
The bike and run courses both pass the spectator area each lap to enable the athletes to receive great support.... so don't forget your cheer squad!

Course maps are available via the menu above.

The distances will be (ages as at 31/12/2025) 

Tristart – 8 yrs old: 100m swim – 1500m bike – 600m run
Tristar1 – 9-10 yrs old: 200m swim – 4km bike – 1.2km run
Tristar2 – 11-12 yrs old: 300m swim – 6km bike – 1.8km run
Tristar3 – 13-14 yrs old: 500m swim – 8km bike – 2.4km run
Youth – 15-16 yrs old: 500m swim – 8km bike – 2.4km run

All competitors must provide their own helmet and bike.        

Reasons to enter this event:

Stunning venue

Easy to follow course

Supportive marshals

Spectator friendly

FREE event photos

Custom designed medal

Finish line snacks & goodies

Registration will open from 9:30am on Saturday, with racing starting from 11am. Detailed start times will be included in the Athlete race guide issued a week before the event.