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Half Ironman Triathlons in United Kingdom

The Half Ironman, also known as the Middle Distance Triathlon or 70.3, consists of a 1.2 mile (1.9k) swim, 56 mile (90k) cycle, and 13.1 mile (21.1k) run. There are two official Ironman 70.3 events in the UK, in Weymouth and Staffordshire.
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  • SEP28
    Hever Castle Triathlon and Sport Festival
    Hever, South East, United Kingdom

    The UKs second biggest triathlon, the worlds largest childrens triathlon and the finale of both the Castle Tri Series and the UK triathlon season.

    A...

    £30 - £270
    • Triathlon
    • Swimming
    • Half Ironman
    • Olympic
    • Super Sprint
    • Duathlon
    • Running
    • Half Marathon
    • 10k
  • SEP22
    Ironman 70.3 Weymouth
    Weymouth, South West, United Kingdom

    Famous for hosting the 2012 Olympic and Paralympic Sailing events, Weymouth will now be hosting the ultimate test of endurance. For one day only this...

    £260 - £330
    • Triathlon
    • Half Ironman
  • SEP28
    Mumbles Triathlon
    Mayals, Wales, United Kingdom

    The award-winning Mumbles Triathlon has become a well known event in South Wales, and attracts a number of athletes from all levels and...

    £45 - £125
    • Triathlon
    • Half Ironman
    • Sprint
    • Super Sprint
  • SEP22
    Conquer The Chilterns Triathlon
    Fawley, South East, United Kingdom

    Take part in the Chilterns Triathlon, in the heart of the Thames Valley and only an hour from London.

    This is one of the most scenic triathlons in the...

    £60 - £115
    • Triathlon
    • Half Ironman
  • JUN13
    The SportPursuit Slateman Triathlon
    Llanberis, Wales, United Kingdom

    A swim surrounded with mountains, a bike course in the heart of the Snowdonia National Park and a run through an awesome slate quarry - we challenge you to...

    £26 - £190
    • Triathlon
    • Olympic
    • Sprint
    • Half Ironman
    • Duathlon
    • Swimming
  • SEP22
    The Wasdale Triathlon Half X
    Seascale, North West, United Kingdom

    Described as the deepest, steepest and the highest, this half Ironman challenge is surely one of the toughest in the Country. The swim is in Wastwater, the...

    £150
    • Triathlon
    • Half Ironman
  • SEP22
    Outlaw X
    Newark, East Midlands, United Kingdom
    • Triathlon
    • Half Ironman
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More United Kingdom Half Ironman Triathlons

About Half Ironman Triathlons in the UK

The Half Ironman (aka Middle Distance or 70.3) is a real test, but definitely achievable for those willing to put in two to three months of consistent training in advance. The race consists of a 1.9k (1.2-mile) swim, 90k (56-mile) cycle and a 21.1k run (13.1-mile/half-marathon): the total distance is 113k or 70.3 miles, hence the name. The distance of each stage is exactly half that of a Full Ironman event, which has a total distance of 140.6 miles (226.2k).

Ahead of any race, be sure to read up on the requirements for essential equipment. Some events won’t let you compete if you don’t have the right gear. A wetsuit requirement is certainly something to look out for, and the norm in the UK because of our cold waters. We’ve put together a list of the essentials to get you going.

What are the best Half Ironman events?

Long form triathlons have been gaining in popularity in recent years and the number of events has swollen. The Ironman UK and Ironman Wales events both host the shorter 70.3 format but there are plenty of flagship events for the Middle Distance Triathlon. Weymouth 70.3 and Hever Castle Triathlon are two famous examples.

What is the average time to complete a Half Ironman triathlon?

It’s really hard to say how long these events should take an athlete to complete. At one end of the spectrum, you have the professionals who will finish these events in or around the four hour mark. But a lot of the time required can be down to the course itself, some are very flat and fast and others pride themselves on being more rugged and challenging. A very good time for an amateur athlete would be five to six hours for males and six to seven for females.

How long should I train for a Half Ironman triathlon?

To get yourself to the level of fitness required to finish one of these events we’d recommend you train for around three months. We’ve put together a Middle Distance training plan to help you on your way. Don’t forget to taper as you’ll want your energy reserves to be full. These events are a real test of your grit, but if you’ve finished one already and are looking for your next challenge then maybe you should try your hand at the Full Distance Triathlon.