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.
Featured events are listed below - select a month/region or the map view to see all events.
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!
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.
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.
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.
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.
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.
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.
Situated in the renowned Cardiff Bay, this event stands out as a truly memorable city race. The event village and transition area are on Roald Dahl Plass in front of the Wales Millenium Centre.
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.
One of the most popular distances within the sport of triathlon, catering to both amateur and professional athletes, striking a balance between speed and endurance.
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.
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!
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!
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.
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.
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.
Select your location for Half Ironman and 70.3 triathlons in your area.