IRONMAN 70.3 Versailles: a hotly anticipated royal debut this Sunday, October 11

Originally scheduled for July 2026 before being postponed because of the heatwave, the inaugural IRONMAN 70.3 Versailles will finally take place this Sunday, October 11. Eagerly awaited by its 2,000 entrants, 40% of them from abroad, the race will start at 8 a.m. from the Grand Canal at the Château de Versailles.

The announcement of an IRONMAN 70.3 in Versailles had sent triathletes across much of northern France into a collective frenzy. At last, they had a race from the prestigious series close to home, without having to head south or travel to the far west of the country.

It was a perfect destination for the region’s huge pool of triathletes, who rushed to sign up. Registration sold out in three hours, a record for a French event. No fewer than 40% of entrants came from abroad, underlining how the royal city’s proximity to Paris’s major airports also helped draw athletes in and set the event up for success.

The event moves to autumn

Unfortunately, last summer’s heatwave dashed competitors’ hopes of taking on the race on July 12, as originally planned. Just three days before the scheduled date, a tight turnaround, especially for international participants, a prefectural order banned the event from going ahead. It was therefore postponed to October 11, 2026, causing no small amount of commotion in the triathlon community.

Swimmers will take the plunge in the Grand Canal for the first time

Two thousand participants will line up at 8 a.m. on Sunday for Versailles’ inaugural event. But the three disciplines have undergone another change in recent weeks, once again because of the weather conditions that are forcing outdoor sports organisers to adapt as best they can.

The 1,900-metre swim was originally due to take place in the Pièce d’Eau des Suisses. Instead, it will be held in the Grand Canal at the Château de Versailles because the pond’s water level fell exceptionally low during the summer drought. A cyanobacterial bloom was also detected in the Pièce d’Eau des Suisses.

It is another change the triathletes will take in their stride. Dug between 1668 and 1679 on the orders of Louis XIV and designed by André Le Nôtre, the Grand Canal stretches for 1.6 km. Normally reserved for rowing and small paddle boats, it has never been used for swimming. The IRONMAN 70.3 Versailles triathletes will therefore be breaking new ground.

A bucolic bike course and a monumental run

Once they emerge from the water, the triathletes will head into the Vallée de Chevreuse for a largely flat 90 km bike leg, with just 750 m of elevation gain. This is where Parisian cyclists traditionally escape for their Sunday rides. Along the way, they will tackle the iconic Côte de la Vacheresse, 1.6 km at 4.6%, the enchanting roads around the Abbaye des Vaux de Cernay, with 6 km through pristine countryside, and the famous Colline des 17 Tournants, 1.3 km at 5.7%, a must-ride climb in the region.

The final half-marathon, with 155 m of elevation gain, will consist of three loops through the heart of the city, as well as around the Pièce d’Eau des Suisses and the Potager du Roi. The finish will be a spectacular one, on Avenue de Paris with the Château de Versailles as its backdrop.

Given the course and the atmosphere on offer, there is little doubt that the athletes taking part, all age-groupers for this inaugural edition, will feel the wait was worthwhile when they finally get to experience this royal triathlon.

Thirty men’s and 30 women’s slots will be awarded, giving athletes the chance to qualify for the 2027 IRONMAN 70.3 World Championship in Tennessee next June.