Half Ironman triathlons

Half Ironman triathlons

Middle distance (aka 70.3) triathlon events | 1.2 mile swim + 56 mile bike + 13.1 mile run

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Half Ironman triathlons in the UK

Completing a Half Ironman is a real feat of endurance but is do-able if you are willing to put in the training time. Also called a 70.3 triathlon or middle distance triathlon, these long-distance events involve a 1.2-mile swim (1.9km), a 56-mile bike ride (90km), and a 13.1-mile run (21.1km) - a total of 70.3 miles completed in an average of around 6 hours. Select your location for 70.3 triathlons in your area or scroll down to see major events coming up.

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70.3 triathlons in 2024

Featured events are listed below - select your region to see all events.

Race through the beautiful grounds of stunning Belvoir Castle out into surrounding Leicestershire in a 'half ironman' distance triathlon then celebrate with friends and family in the festival village.
  • Sun 28 Jul
  • £196-£295
Grantham, Leicestershire, UK

Belvoir Castle | Gauntlet Triathlon

Race through the beautiful grounds of stunning Belvoir Castle out into surrounding Leicestershire in a 'half ironman' distance triathlon then celebrate with friends and family in the festival village.

  • 1.9 km lake swimming
  • 90 km road cycling
  • 21 km road running
A gruelling Half Ironman-style challenge set over a weekend starting with a 1.2-Mile Swim on Friday, 56-Mile Sportive on Saturday then a Half Marathon on Sunday, supported by the best ever crowds!
  • Fri 6 Sep
  • £199
Masham, North Yorkshire, UK

Half Long Course Weekend

A gruelling Half Ironman-style challenge set over a weekend starting with a 1.2-Mile Swim on Friday, 56-Mile Sportive on Saturday then a Half Marathon on Sunday, supported by the best ever crowds!

  • 1.2 miles lake swimming
  • 56 miles road cycling
  • 13.1 miles road running
The Long Course Weekend challenge specifically tailored to junior athletes. Swim on Friday, cycle on Saturday and run on Sunday. Same massive crowds and the same awesome experience!
  • Fri 6 Sep
  • £149
Masham, North Yorkshire, UK

Junior Long Course Weekend

The Long Course Weekend challenge specifically tailored to junior athletes. Swim on Friday, cycle on Saturday and run on Sunday. Same massive crowds and the same awesome experience!

  • 1.2 miles lake swimming
  • 56 miles road cycling
  • 10 km road running
Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.
  • Sat 7 Sep
  • £230-£235
Ulverston, Cumbria, UK

THE ROC ENGLAND

Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.

  • 1.5 km lake swimming
  • 92 km road cycling
  • 18.5 km multi terrain running
Taking place across the scenic Thames Valley area with routes going through Culden Faw Estate. Swim the river, cycle the hilly open roads, run through the trail paths enjoying great views.
  • Sun 22 Sep
  • £110
Marlow, Buckinghamshire, UK

The One on the River | Henley | Middle Distance Triathlon

Taking place across the scenic Thames Valley area with routes going through Culden Faw Estate. Swim the river, cycle the hilly open roads, run through the trail paths enjoying great views.

  • 1900 m river swimming
  • 89 km road cycling
  • 20 km trail running
Not for the faint hearted, this race pushes competitors to their limits whilst visiting every corner of the beautiful castle estate and its surrounding rural area into the High Weald AONB.
  • Sun 29 Sep
  • £196-£295
Edenbridge, Kent, UK

Hever Castle Triathlon and Multisport Festival | Gauntlet Triathlon

Not for the faint hearted, this race pushes competitors to their limits whilst visiting every corner of the beautiful castle estate and its surrounding rural area into the High Weald AONB.

  • 1.9 km lake swimming
  • 90 km road cycling
  • 21 km road running
Scotland, you are immense. ROC Scotland athletes, you are legends! THE ROC takes on the Highlands, from Kinlochleven to the summit of Ben Nevis, the UK’s highest mountain and back.
  • Sat 5 Oct
  • £230-£240
Kinlochleven, Highland, UK

THE ROC SCOTLAND

Scotland, you are immense. ROC Scotland athletes, you are legends! THE ROC takes on the Highlands, from Kinlochleven to the summit of Ben Nevis, the UK’s highest mountain and back.

  • 1.5 km lake swimming
  • 53 km mountain biking
  • 18.5 km multi terrain running
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
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!

  • 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
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.

  • 1.2 miles lake swimming
  • 56 miles road cycling
  • 13.1 miles road 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
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.

  • 1900 m lake swimming
  • 92 km road cycling
  • 21 km road running
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 1 Jun 2025
  • £99
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.

  • 1900 m lake swimming
  • 90 km road cycling + 1844 ft ascent
  • 21 km multi terrain running + 253 ft ascent
The Middle Distance Triathlon will not fail to impress. With stunning views of Weymouth nature reserve and a true test of stamina, you'll be beaming with pride at the finish line.
  • Sun 8 Jun 2025
  • £95-£125
Weymouth, Dorset, UK

Weymouth Middle Distance Triathlon

The Middle Distance Triathlon will not fail to impress. With stunning views of Weymouth nature reserve and a true test of stamina, you'll be beaming with pride at the finish line.

  • 1900 m sea swimming
  • 90 km road cycling
  • 21 km multi terrain running
Previously known as Mount Edgcumbe Triathlon, triathletes of all abilities can experience a truly exceptional coastal venue, finishers medal, t-shirt and memorable day out at a fantastic event.
  • Sun 15 Jun 2025
  • £99
Torpoint, Cornwall, UK

Plymouth Triathlon | Middle Distance

Previously known as Mount Edgcumbe Triathlon, triathletes of all abilities can experience a truly exceptional coastal venue, finishers medal, t-shirt and memorable day out at a fantastic event.

  • 1.9 km sea swimming
  • 90 km road cycling
  • 20 km trail running
Racing through the hills Kielder Forest and on hard-packed trails around the lake, this half distance triathlon is a serious test of endurance.
  • Sun 29 Jun 2025
  • £195-£210
Hexham, Northumberland, UK

The Northumbrian | Half Iron Distance

Racing through the hills Kielder Forest and on hard-packed trails around the lake, this half distance triathlon is a serious test of endurance.

  • 1.2 miles lake swimming
  • 56 miles road cycling
  • 13.1 miles trail running

Half Ironman triathlons near you

Select your location for Half Ironman and 70.3 triathlons in your area.