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Half Ironman (middle distance) in UK

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

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Face up to the mountain in one of Europe's most inspiring locations. From Windermere to Coniston to summit England's highest mountain, if you love a tough and rewarding challenge - you'll thrive.
  • Sat 6 Sep
  • £240-£260
Ulverston, Cumbria, UK

THE ROC ENGLAND

Face up to the mountain in one of Europe's most inspiring locations. From Windermere to Coniston to summit England's highest mountain, if you love a tough and rewarding challenge - you'll thrive.

  • Recycling
  • Plastic bottle free
  • Music
  • Chip timing
  • Enter online
  • Mountainous
  • Event village
  • Rural
  • Mountains
  • Sustainability policy
  • Plastic-free event
  • Age 18 & over
  • 1.5 km lake swimming
  • 92 km road cycling
  • 18.5 km multi terrain running
Bringing back the Sundowner 70.3 Triathlon! An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is now back on the race calendar and 100% going ahead!
  • Sat 13 Sep
  • £120-£130
York, East Yorkshire, UK

Sundowner 70.3 Triathlon

Bringing back the Sundowner 70.3 Triathlon! An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is now back on the race calendar and 100% going ahead!

  • Chip timing
  • Enter online
  • Flat
  • Age 18 & over
  • 1900 m lake swimming
  • 90 km road cycling + 287 ft ascent
  • 21 km trail running + 17 ft ascent
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.
  • Sun 21 Sep
  • £160-£180
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
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 28 Sep
  • £245-£295
Edenbridge, Kent, UK

Hever Castle | 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.

  • Chip timing
  • Enter online
  • Age 18 & over
  • 1.9 km lake swimming
  • 90 km road cycling + 2392 ft ascent
  • 21 km road running
THE ROC takes in the Highlands. Kinlochleven to the summit of Ben Nevis and back, including a Loch swim, stunning mountain/gravel bike sections and the UK's highest mountain!
  • Sat 4 Oct
  • £240-£260
Kinlochleven, Highland, UK

THE ROC SCOTLAND

THE ROC takes in the Highlands. Kinlochleven to the summit of Ben Nevis and back, including a Loch swim, stunning mountain/gravel bike sections and the UK's highest mountain!

  • Recycling
  • Plastic bottle free
  • Music
  • Chip timing
  • Enter online
  • Hilly
  • Mountainous
  • Event village
  • Rural
  • Mountains
  • Sustainability policy
  • Plastic-free event
  • Age 18 & over
  • 1.5 km lake swimming
  • 53 km mountain biking
  • 18.5 km multi terrain running
The totally unique ROC format, from Abersoch Bay to the top of Wales’ highest mountain and back. Swim, Bike, Mountain, Bike, Run; THE ROC WALES is triathlon - tough and redefined.
  • Sat 9 May 2026
  • £195-£225
Pwllheli, Gwynedd, UK

THE ROC WALES

The totally unique ROC format, from Abersoch Bay to the top of Wales’ highest mountain and back. Swim, Bike, Mountain, Bike, Run; THE ROC WALES is triathlon - tough and redefined.

  • Recycling
  • Plastic bottle free
  • Entertainment
  • Music
  • Chip timing
  • Enter online
  • Hilly
  • Mountainous
  • Event village
  • Event expo
  • Coast
  • Mountains
  • Sustainability policy
  • Plastic-free event
  • Age 18 & over
  • 1.5 km sea swimming
  • 100 km road cycling
  • 13 km multi terrain running + 3330 ft ascent
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 16 - Sun 17 May 2026
  • £160-£165
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
  • 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
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 17 May 2026
  • £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
  • 1.9 m lake swimming
  • 93 km road cycling + 8490 ft ascent
  • 20 km road running + 3288 ft ascent
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 24 May 2026
  • £120-£135
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
  • 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
  • £155-£175
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
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 14 Jun 2026
  • £135
Weymouth, Dorset, UK

Weymouth WMD Triathlon | 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.

  • Chip timing
  • Enter online
  • Undulating
  • Age 18 & over
  • 1900 m sea swimming
  • 90 km road cycling + 2501 ft ascent
  • 21 km multi terrain running + 259 ft ascent
Get active in the beautiful grounds and surrounding area of stunning Cheshire in the epic Gauntlet! Bring your friends and celebrate completing your challenge in the festival village.
  • Sun 21 Jun 2026
  • £196-£245
Malpas, Cheshire, UK

Cholmondeley Castle | Gauntlet Triathlon

Get active in the beautiful grounds and surrounding area of stunning Cheshire in the epic Gauntlet! Bring your friends and celebrate completing your challenge in the festival village.

  • Chip timing
  • Enter online
  • Age 18 & over
  • 1.9 km lake swimming
  • 84 km road cycling
  • 21 km road running
A jewel in the castle crown! Get active in the beautiful grounds and surrounding area of stunning Leicestershire in the epic Gauntlet Triathlon! Celebrate in the festival village afterwards.
  • Sun 19 Jul 2026
  • £196-£245
Grantham, Leicestershire, UK

Belvoir Castle | Gauntlet Triathlon

A jewel in the castle crown! Get active in the beautiful grounds and surrounding area of stunning Leicestershire in the epic Gauntlet Triathlon! Celebrate in the festival village afterwards.

  • Chip timing
  • Enter online
  • Age 18 & over
  • 1.9 km lake swimming
  • 90 km road cycling + 957 ft ascent
  • 21 km road running
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
  • Sun 7 Sep
Bexhill-on-Sea, East Sussex, UK

The 1066 Triathlon | Middle Distance Triathlon

  • 1900 m sea swimming
  • 80 km road cycling + 1910 ft ascent
  • 21 km road running
  • Sun 14 Sep
Weymouth, Dorset, UK

IRONMAN 70.3 Weymouth

  • 1.2 miles sea swimming
  • 56 miles road cycling
  • 13.1 miles road running
  • Sat 20 Sep
Caernarfon, Gwynedd, UK

The Brutal Extreme Triathlon | The Brutal Canol Half

  • 1.2 miles lake swimming
  • 57.98 miles road cycling
  • 14.7 miles trail running
  • Sun 21 Sep
Henley-on-Thames, Buckinghamshire, UK

The One on the River | Henley | Middle Distance Triathlon

  • 1900 m river swimming
  • 78.5 km road cycling
  • 20 km trail running
  • Sun 21 Sep
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Superfeet Sandman Triathlon and Duathlon | Legend (70.3) Triathlon

  • 1900 m sea swimming
  • 93 km road cycling + 3175 ft ascent
  • 19.8 km multi terrain running + 570 ft ascent
  • Sun 19 Jul 2026
Warwick, Warwickshire, UK

On The Edge Middle Distance Triathlon

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

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