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Half Ironman (middle distance) in UK in May 2025

Find half ironman (middle distance) near me in UK in May 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.

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A lake swim, a trail run and a road ride over the course of the festival weekend. Conquer a triathlon challenge over two days. Includes Full Weekend Festival Ticket in the price!
  • Sat 17 - Sun 18 May 2025
  • £155-£160
  • Sat 17 - Sun 18 May 2025
  • £155-£160
Keswick, Cumbria, UK

Keswick Mountain Festival | Keswick Conqueror

A lake swim, a trail run and a road ride over the course of the festival weekend. Conquer a triathlon challenge over two days. Includes Full Weekend Festival Ticket in the price!

  • Newcomers
  • Music
  • Chip timing
  • Enter online
  • Mountainous
  • Event village
  • Age 18 & over
  • 3.6 km lake swimming
  • 100 km road cycling + 1625 m ascent
  • 25 km trail running + 866 m ascent
Flat, fast and very popular! This open water tri comprises a swim in Regatta Lake, a relatively flat bike course and flat run laps of the lake and River Trent Path . All levels welcome, solo or relay.
  • Sun 18 May 2025
  • £50-£256.80
  • Sun 18 May 2025
  • £50-£256.80
Nottingham, Nottinghamshire, UK

Outlaw Half Nottingham

Flat, fast and very popular! This open water tri comprises a swim in Regatta Lake, a relatively flat bike course and flat run laps of the lake and River Trent Path . All levels welcome, solo or relay.

  • Chip timing
  • Enter online
  • Age 18 & over
  • 1.2 miles lake swimming
  • 56 miles road cycling
  • 13.1 miles road running
Challenge yourself to tackle a 100km Centurion this year, a distance made popular by the PTO race series. Ideal if you're training for a 70.3 Half-Iron or taking a step up from Standard Distance Tri.
  • Sun 18 May 2025
  • £120-£139.98
  • Sun 18 May 2025
  • £120-£139.98
Bedford, Bedfordshire, UK

ATW Box End Centurion 100km Triathlon

Challenge yourself to tackle a 100km Centurion this year, a distance made popular by the PTO race series. Ideal if you're training for a 70.3 Half-Iron or taking a step up from Standard Distance Tri.

  • Enter online
  • Undulating
  • Age 18 & over
  • 2250 m lake swimming
  • 80 km road cycling
  • 20 km trail running
This triathlon returns for another successful year! It’s a superb swimming venue with quiet rolling roads for the bike course and a cracking run too. Plus there's lakeside camping available too.
  • Sun 18 May 2025
  • £135
  • Sun 18 May 2025
  • £135
Lifton, Devon, UK

Roadford Lake Triathlon | Middle Distance

This triathlon returns for another successful year! It’s a superb swimming venue with quiet rolling roads for the bike course and a cracking run too. Plus there's lakeside camping available too.

  • Chip timing
  • Enter online
  • Undulating
  • Age 18 & over
  • 1900 m lake swimming
  • 92 km road cycling
  • 21 km road running

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