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Half Ironman (middle distance) in UK

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

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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 5 Jul
  • £155-£175
  • Sat 5 Jul
  • £155-£175
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
Swim, bike, run your way from Windsor Castle to Brighton on this unique, non-competitive, point-to-point adventure through the North & South Downs. Fully way-marked (no navigation) and full support.
  • Sat 19 Jul
  • £265-£295
  • Sat 19 Jul
  • £265-£295
Windsor, Buckinghamshire, UK

Castle To Coast Triathlon

Swim, bike, run your way from Windsor Castle to Brighton on this unique, non-competitive, point-to-point adventure through the North & South Downs. Fully way-marked (no navigation) and full support.

  • Newcomers
  • Chip timing
  • Enter online
  • Event village
  • Rural
  • Age 18 & over
  • 1.2 miles lake swimming
  • 67 miles road cycling + 3550 ft ascent
  • 14 miles trail running + 1512 ft ascent
Entries close soon
Award winning full and middle-distance triathlons, plus a marathon, long-distance swims, aquabike options and triathlon relays.
  • Sun 20 Jul
  • Entries close soon
  • Sun 20 Jul
  • Entries close soon
Eastbourne, East Sussex, UK

TriBourne Festival of Endurance | Middle Distance Triathlon

Award winning full and middle-distance triathlons, plus a marathon, long-distance swims, aquabike options and triathlon relays.

  • Enter online
  • Age 18 & over
  • 1.2 miles sea swimming
  • 56 miles road cycling
  • 13.1 miles trail 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 20 Jul
  • £245-£295
  • Sun 20 Jul
  • £245-£295
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
Awarded the Event of the year (2021) in the Welsh Triathlon Awards, The Craft Snowman is well known as the toughest multi-terrain triathlon in the UK. It is not for the faint-hearted.
  • Sun 3 Aug
  • £224.99-£249.99
  • Sun 3 Aug
  • £224.99-£249.99
Betws-y-Coed, Clwyd, UK

Craft Snowman Legend (70.3) Triathlon

Awarded the Event of the year (2021) in the Welsh Triathlon Awards, The Craft Snowman is well known as the toughest multi-terrain triathlon in the UK. It is not for the faint-hearted.

  • Chip timing
  • Enter online
  • Mountainous
  • Age 18 & over
  • 1900 m lake swimming
  • 95.6 km road cycling + 5045 ft ascent
  • 21.2 km multi terrain running + 2926 ft ascent
Now twice-yearly due to popularity, the 70.3 Tri has 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 31 Aug
  • £140
  • Sun 31 Aug
  • £140
Lifton, Devon, UK

Roadford Lake Triathlon | Middle Distance

Now twice-yearly due to popularity, the 70.3 Tri has 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
  • Age 18 & over
  • 1.9 km lake swimming
  • 93 km road cycling + 4245 ft ascent
  • 21 km road running + 1073 ft ascent
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
  • 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
Join us, UPrevail Events, in bringing back the Sundowner. An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is back on the race calendar for 2025.
  • Sat 13 Sep
  • £120-£130
  • Sat 13 Sep
  • £120-£130
York, East Yorkshire, UK

Sundowner Triathlon | 70.3 Triathlon

Join us, UPrevail Events, in bringing back the Sundowner. An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is back on the race calendar for 2025.

  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Sun 6 Jul
Wells-next-the-Sea, Norfolk, UK

Outlaw Half Holkham Weekend | Outlaw Half Holkham

  • 1.2 miles lake swimming
  • 56 miles road cycling
  • 13.1 miles road running
  • Sun 20 Jul
Warwick, Warwickshire, UK

On The Edge Middle Distance Triathlon

  • 1.2 miles pool swimming
  • 56 miles road cycling
  • 13.1 miles road running
  • Sun 10 Aug
London, UK

London T100 | 100km

  • 2 km dock swimming
  • 80 km road cycling
  • 18 km road running
  • Sat 23 Aug
Cairndow, Argyll and Bute, UK

THE RESTLESS Gravel XTRI

  • 1.8 km lake swimming
  • 50 km gravel riding
  • 25 km xc running
  • Sun 31 Aug
Ellesmere, Shropshire, UK

Shropshire Triathlon | Middle Distance and Relay

  • 2 km lake swimming
  • 78 km road cycling
  • 20 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

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