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Triathlons

Triathlon is a multidiscipline sport, combining swimming, cycling and running in sequence.There are five official distances: Sprint Distance (750m swim, 20km bike, 5km bike); Olympic (1.5km swim, 40km bike, 10km swim); ITU Long (3km swim, 80km bike, 20km run); Half/Middle-Distance/70.3/Half-Ironman (1.9km swim, 90km bike, 21.1km run); Full/Ironman (3.8km swim, 180km bike, 42.2km run). There are other unofficial distances, such as super-sprint triathlons or ultra-triathlons. Multisports have been growing in popularity in the UK over recent years, particularly triathlons. The UK now has over 1,000 triathlon events each year with over 200,000 participants. Some triathlons take place in cities, with the swim section in pools or manmade lakes, and the cycle and run elements through cities and past landmarks. Alternatively, some triathlons require open-water swimming in the sea, and take the cycling and running sections off-road onto trails and difficult terrains. There are multisport variations of triathlons such as duathlon, aquathlon, and aquabike, which focus on two of the disciplines but not all three.

Nearby Triathlons

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  • 3JUL2021

    The Festival of Endurance at Hever Castle

    Multi-Sport ‧ Hever Castle
    140.6 mi • 76.9 mi • 75.6 mi • 70.2 mi • 38.5 mi • 37.0 mi • 26.2 mi • 15.4 mi • 13.1 mi • 7.4 mi
    £30 – £270C-19 Plan
    (1)
  • 6AUG2021

    The London Triathlon

    Triathlon ‧ London
    497.1 mi • 56.9 mi • 32.0 mi • 16.0 mi • 8.0 mi
    £62.99 – £205.50C-19 Plan
    (157)
  • 28MAY2021

    Lough Cutra Castle Triathlon

    Triathlon ‧ Gort
    73.9 mi • 32.0 mi • 30.3 mi • 16.0 mi • 15.2 mi • 10.6 mi • 9.8 mi • 6.8 mi • 4.2 mi • 3.6 mi • 3.0 mi
    £25 – £165C-19 Plan
  • 26JUN2021

    Cardiff Triathlon

    Triathlon ‧ Cardiff
    29.5 mi • 16.4 mi • 14.9 mi • 7.6 mi
    £66.95 – £94.95C-19 Plan
    (1)
  • 10SEP2021

    Blenheim Palace Triathlon

    Triathlon ‧ Blenheim Palace Grounds
    16.1 mi • 10.3 mi • 10.2 mi
    C-19 Plan
    (18)
  • 24SEP2021

    Hever Castle Triathlon and Sport Festival

    Multi-Sport ‧ Hever
    70.2 mi • 35.0 mi • 32.0 mi • 30.3 mi • 25.8 mi • 18.6 mi • 16.0 mi • 15.2 mi • 12.9 mi • 10.7 mi • 7.1 mi • 7.0 mi • 3.9 mi • 3.6 mi • 3.5 mi
    £25 – £165C-19 Plan
    (4)
  • 22MAY2021

    The Marlow Classic

    Multi-Sport ‧ Marlow
    68.7 mi • 66.8 mi • 54.4 mi • 32.3 mi • 30.1 mi • 23.9 mi • 21.4 mi • 18.8 mi • 15.7 mi • 1.9 mi • 0.9 mi • 0.5 mi
    £15 – £110C-19 Plan
    (14)
  • 11JUN2021

    The SportPursuit Slateman10 Triathlon & Duathlon

    Multi-Sport ‧ Llanberis
    73.1 mi • 41.6 mi • 39.1 mi • 17.6 mi • 16.5 mi
    £61.95 – £165C-19 Plan
    (1)
  • 11JUN2021

    Adventure Championships Triathlon

    Sprint ‧ Wales
    213.1 mi • 129.6 mi • 57.2 mi
    £214.95 – £414.95C-19 Plan
  • 23JUL2021

    Castle Howard Triathlon

    Multi-Sport ‧ Castle Howard
    70.2 mi • 35.1 mi • 34.1 mi • 17.9 mi • 17.1 mi • 17.0 mi • 12.9 mi • 9.4 mi • 6.8 mi • 5.5 mi • 3.7 mi • 3.6 mi • 3.4 mi
    £25 – £165C-19 Plan
  • 18JUN2021

    Cholmondeley Castle Triathlon

    Multi-Sport ‧ Malpas
    73.9 mi • 36.7 mi • 34.5 mi • 32.8 mi • 28.3 mi • 18.3 mi • 16.4 mi • 14.1 mi • 10.4 mi • 7.1 mi • 6.9 mi • 6.8 mi • 4.2 mi • 3.8 mi • 3.7 mi • 3.6 mi
    £25 – £165C-19 Plan
    (1)
  • 3JUL2021

    Outlaw Half – Holkham

    Half Ironman ‧ Holkham Estate
    70.2 mi
    £195 – £225C-19 Plan
    (11)
  • 17SEP2021

    Superfeet Sandman Triathlon & Duathlon

    Multi-Sport ‧ Llanfairpwllgwyngyll
    71.3 mi • 61.4 mi • 45.9 mi • 43.5 mi • 18.9 mi • 18.1 mi
    £66.95 – £170C-19 Plan
  • 30JUL2021

    The Snowman Triathlon & Duathlon

    Multi-Sport ‧ Betws-y-Coed
    71.5 mi • 50.8 mi • 49.2 mi • 24.5 mi • 23.5 mi
    £61.95 – £165C-19 Plan
    (1)
  • 27AUG2021

    Conquer The Chilterns

    Multi-Sport ‧ Fawley
    67.1 mi • 67.0 mi • 49.6 mi • 42.9 mi • 41.3 mi • 34.5 mi • 23.3 mi • 22.2 mi • 19.1 mi • 13.1 mi • 6.2 mi • 3.1 mi • 1.9 mi • 0.9 mi • 0.5 mi
    £15 – £110C-19 Plan
  • 3SEP2021

    Dorney Lake Run & Multisport Weekender

    Multi-Sport ‧ Dorney
    34.2 mi • 32.0 mi • 25.8 mi • 21.7 mi • 18.6 mi • 16.0 mi • 15.5 mi • 13.1 mi • 12.9 mi • 9.3 mi • 8.0 mi • 6.5 mi • 6.2 mi • 3.1 mi • 1.9 mi • 0.9 mi • 0.5 mi
    £15 – £75C-19 Plan
    (8)
  • 30MAY2021

    Swansea Triathlon

    Sprint ‧ Swansea
    16.0 mi
    £60 – £100C-19 Plan
  • 3JUL2021

    The Fugitive

    Multi-Sport ‧ Marlow
    68.7 mi • 66.8 mi • 54.4 mi • 32.3 mi • 30.1 mi • 23.9 mi • 21.4 mi • 18.8 mi • 15.7 mi • 1.9 mi • 0.9 mi • 0.5 mi
    £15 – £110C-19 Plan
    (4)
  • 17APR2021

    Harlech Triathlon & Duathlon

    Multi-Sport ‧ Harlech
    17.8 mi • 17.0 mi
    £43 – £53C-19 Plan
    (1)
  • 3JUL2021

    Ironman UK

    Multi-Sport ‧ Bolton
    140.4 mi • 0.9 mi • 0.6 mi • 0.3 mi
    C-19 Plan
    (5)
  • 24JUL2021

    Triathlon Team Relays Bedford

    Super Sprint ‧ Bedford
    16.0 mi
    £162 – £177C-19 Plan
  • 31JUL2021

    Dorney Lake Triathlon

    Triathlon ‧ Windsor
    32.0 mi • 16.0 mi • 8.0 mi
    £51 – £75C-19 Plan
  • 15MAY2021

    Exmouth Triathlon

    Triathlon ‧ Exmouth
    15.8 mi • 8.0 mi • 5.4 mi • 3.5 mi • 2.3 mi • 1.1 mi
    £18 – £45C-19 Plan
  • 25SEP2021

    Dawlish Triathlon

    Triathlon ‧ Dawlish Warren
    18.5 mi • 13.2 mi
    £34 – £49C-19 Plan
Showing 1 - 24 of 35 events
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Triathlons in the UK

The triathlon is a multi-sport event combining swimming, cycling and running. The length and duration of these events can vary greatly, ranging from just a few miles to 140 plus. In addition, conditions in competition can differ from event to event. The swim could be in an indoor pool or the sea, and cycling or running on flat coastal roads or rolling countryside hills.

The UK plays host to some of the best triathlon events in the world. Large scale events such as the ITU Worlds Triathlon Leeds and London Triathlon host athletes of all levels of experience with big crowds building a buzzing atmosphere.

What you need to know about Triathlons

The Super-Sprint distance (400m,10k, 2.5k) and Sprint distance (750m, 20k, 5k) triathlons are great for beginners looking to explore multi-sport. These events can be attempted without much prior training, however, if you want to be competitive you should practice your transitions as they can make a big difference to your time. Our 8 week sprint triathlon training plan will get you up to speed. If you are well prepared you could expect to finish a Super-Sprint in under an hour and the Sprint in under 90 minutes.

Olympic (1.5k, 40k, 10k) distance triathlons are the standard distance for international competition. To be competitive here, you’ll need to take your training seriously. We recommend following our 12 week middle distance triathlon training plan (designed for Half Ironman preparation) to get you in shape. If you want to compete in a big name event, the ITU World Triathlon event in Leeds is one of the most popular in the UK, and you’ll get to see some of the worlds best competing for the World Series title. If you can finish one of these in under 3 hours, kudos to you.

The final two distances are the Middle Distance / Half Ironman (1.9k, 90k, 21.1k) and the Full Distance / Ironman (3.8k, 180k, 42.2k). Finishing these events is an achievement in itself. IRONMAN UK and the Outlaw Triathlon are among the UK’s favourites. If you have trained well for a Half Ironman you could be pushing for under 6 hours for men and 7 for women. For the full distance, anything under the 17hr cut off point is a solid accomplishment, but under 13 hours (men) and 14 hours (women) deserves serious respect.

Kit

To compete in a triathlon you’ll need the right gear. We’ve written a blog post on 33 essential items to pack for a triathlon, which highlights what you really need and why. Don’t forget your swim cap!

Triathlons by Location

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