Triathlons in East of England
Find triathlons in East of England in 2026/2027 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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- Sun 3 May
- £57-£119
ATW St Neots Triathlon | Race 1
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sun 10 May
- £44-£49
HSV Sprint Triathlon & Aquabike
This is a great race for all standards, from the absolute beginner right through to the seasoned triathlete. The course is fast, flat and has great PB potential.
- Sprint triathlon
- Sprint aquabike
- Sat 16 May
- £79-£180
ATW Big East & Maldon Triathlon
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Half Ironman
- Middle aquabike
- Sat 23 May
- £130
ATW Box End Mixed Team Relay
Unleash your team’s speed and strategy in an exhilarating mixed relay, racing through swim–bike–run laps at Box End’s stunning, spectator-friendly lakeside venue.
- 350 m lake swimming
- 7.7 km road cycling + 102 ft ascent
- 1 km road running
- Sun 24 May
- £67-£139
ATW Box End Triathlon
Experience a choice of multi-sport events — triathlon, relay triathlon and aquabike — at a stunning watersports venue with pristine water, scenic routes, a custom medal and more.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- Half Ironman
- + 1 more race
- Sun 7 Jun
- £146-£187
ATW Grafman Middle Distance Triathlon & Aquabike
One of the country’s most popular middle distance swim-bike-run events, delivered by triathletes for triathletes, at the beautiful and iconic Grafham Water.
- Half Ironman
- Middle aquabike
- Sun 21 Jun
- £66-£119
ATW Stewartby Lake Triathlon & Aquabike
Dive into the ATW Stewartby Lake Triathlon and Aquabike – a flat, fast and friendly race offering stunning lake views, smooth roads, and surefire PB potential.
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sun 21 Jun
- £75-£110
Southend Triathlon
Take on an exciting coastal triathlon in Southend, featuring a sea swim, fast seafront cycle, and scenic run with fantastic crowd support all the way.
- Sprint triathlon
- Olympic triathlon
- Relay triathlon
- Standard aquabike
- Sun 5 Jul
- £69-£175
ATW Odyssey At Box End Triathlon
Get ready for one of the UK’s most exciting triathlon events of the year! Dive into crystal-clear lake waters at Box End, then ride a smooth, rolling bike course and follow scenic on-site run paths.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sprint aquabike
- Standard aquabike
- + 1 more race
- Sat 8 Aug
- £145-£285
- Early bird
ATW Odyssey Triathlon
Complete your own Odyssey on a journey of self-discovery in the Cambridgeshire countryside featuring a swim in the River Ouse, a scenic ride and a run around the beautiful town of St Neots.
Early bird on now
- Ironman
- Half Ironman
- Sat 8 Aug
- £67-£119
ATW St Neots Triathlon | Race 2
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sprint aquabike
- Sat 8 Aug
- £56-£285
ATW First To Full Triathlon Festival
Be part of a UK first. This isn’t just another triathlon—it’s the first event of its kind where you decide the distance, from sprint to full, and race your way.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Ironman
- Sprint aquabike
- + 4 more races
- Sun 16 Aug
- £56-£97
ATW Oundle Triathlon
ATW is the largest triathlon organiser in the UK and is bringing you the Oundle Triathlon! It doesn’t matter if you are an experienced triathlete or this is your very first attempt at swim-bike-run.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sun 20 Sep
- £57-£119
ATW St Neots Triathlon | Race 3
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Super sprint triathlon
- Sprint aquabike
- Sat 26 Sep
- £77-£118
ATW Grafham Triathlon
Sprint or Standard Tri or Aquabike, in and around the beautiful, clean reservoir, on a flat course for all abilities with custom-designed medal, free photos and finish line goodies.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike