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Half Ironman (middle distance) in East of England

Find half ironman (middle distance) in East of England in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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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.
  • Sat 16 May 2026
  • £158-£178
Maldon, Essex, UK

Big East Middle Distance 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.

  • Enter online
  • Undulating
  • Age 18 & over
  • 1500 m river swimming
  • 86 km road cycling + 1112 ft ascent
  • 20 km trail running + 172 ft ascent
Conquer the ATW Centurion 100km Triathlon at Box End Lake — a thrilling endurance challenge featuring pristine open water, fast bike laps, scenic trails and unbeatable support.
  • Sun 24 May 2026
  • £117-£137
Bedford, Bedfordshire, UK

ATW Box End Centurion 100km Triathlon

Conquer the ATW Centurion 100km Triathlon at Box End Lake — a thrilling endurance challenge featuring pristine open water, fast bike laps, scenic trails and unbeatable support.

  • Enter online
  • Undulating
  • Age 18 & over
  • 2250 m lake swimming
  • 81 km road cycling + 1674 ft ascent
  • 20 km trail running + 340 ft ascent
Take on a superb middle distance triathlon at the fantastic Grafham Water. Suitable for all abilites, with a challenging, but achievable course, and custom medal at the finish line.
  • Sun 7 Jun 2026
  • £160-£180
Huntingdon, Cambridgeshire, UK

ATW Grafman Middle Distance Triathlon

Take on a superb middle distance triathlon at the fantastic Grafham Water. Suitable for all abilites, with a challenging, but achievable course, and custom medal at the finish line.

  • Chip timing
  • Enter online
  • Undulating
  • Age 18 & over
  • 1900 m lake swimming
  • 90 km road cycling + 1680 ft ascent
  • 21 km multi terrain running + 0 ft ascent
Get ready for one of the UK’s most exciting triathlon events of the year!
  • Sun 5 Jul 2026
  • £140-£160
Bedford, Bedfordshire, UK

ATW Odyssey At Box End Triathlon | Half Distance Triathlon

Get ready for one of the UK’s most exciting triathlon events of the year!

  • Enter online
  • PB
  • Age 19 & over
  • 2250 m lake swimming
  • 96 km road cycling + 1732 ft ascent
  • 20 km road running + 351 ft ascent
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.
  • Sat 8 Aug 2026
  • £130-£150
St. Neots, Cambridgeshire, UK

ATW Odyssey Half Distance 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.

  • Enter online
  • Undulating
  • Age 19 & over
  • 1900 m river swimming
  • 90 km road cycling + 1686 ft ascent
  • 21.1 km road running
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.
  • Sat 8 Aug 2026
  • £140-£160
St. Neots, Cambridgeshire, UK

ATW First To Full Triathlon Festival | Half Distance Triathlon

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.

  • Enter online
  • PB
  • Age 19 & over
  • 1900 m river swimming
  • 90 km road cycling + 1686 ft ascent
  • 21.1 km road running + 0 ft ascent

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