Five key mountains that will decide the 2026 Tour de France general classification

The full route of the 2026 Tour de France was unveiled months ago, marking the official start of preparations for next season. La Grande Boucle will begin on July 4th with a Grand Départ in Barcelona, featuring a team time trial, and finish on July 26th. There will be 21 demanding stages, with a design that offers opportunities for everyone.

Tadej Pogačar and Jonas Vingegaard start, once again, as the leading favourites, but they face two formidable contenders: Remco Evenepoel and Paul Seixas. The Belgian is already established, a former world champion and reigning double Olympic gold medallist; on the other hand, stands the young French prodigy, who is sweeping all before him this season.

The course features enough high-mountain days to make a difference, seven in total, as well as a double, unprecedented finale on Alpe d’Huez on stages 19 and 20. However, the route will not limit the high mountains to the Alpine colossus alone, with other decisive days for the general classification contenders.

Below, we analyse in detail the most important days of the French summer; the stages the peloton’s leaders have ringed in red on their calendars.

Granollers, a handball stronghold in Spain and a short hop from the Barcelona-Catalunya circuit, a regular Formula 1 and MotoGP venue, is a city of around 65,000 on Barcelona’s outskirts. Proud of its Porxada, a 16th-century market hall that today hosts the municipal market, it will serve as the start of this stage heading north to the French border.

On day three, Catalan fans will have a final chance to see the peloton in action over a route of more than 100 kilometres. Despite 3,950 metres of climbing and the ascent of the Col de Toses before leaving Spain, the traverse across the plateaus near Font-Romeu and the climb to Les Angles (1.7 km at 7% average) could prove perfect terrain for the ambush of a fast-climbing surprise.

Stage six of the Tour de France will be the most selective Pyrenean day on the route, blending the classic with the new. The Tour’s big favourites are likely to test one another on the ascents of the Col d’Aspin and, later, the Col du Tourmalet, provided they choose to open the race before the final 40 kilometres.

If not, the outcome could fall to the best climbers from a breakaway, in the spectacular setting of the Gavarnie cirque, reached via a long but gentle climb: 18.7 kilometres at 4% average gradient.

As we complete exactly two weeks of racing, the action will kick off out of Mulhouse with the ascent of the Grand Ballon and a first pass over the finish line, a mere prelude to the selection on the final climb, which will start to take shape on the Ballon d’Alsace.

This long route hides one of the gems of the 2026 route: the ascent to La Haya, a forest path converted into a cycle lane, with 11.2 kilometres of bends at 7.3% average and an especially irregular profile. Six kilometres will still remain to reach Markstein, on a stretch where fatigue and surges can prove decisive.

Perfectly placed before the second rest day, the 15th day of racing profiles as a big mountain stage that could be decisive in the fight for yellow and seal the fate of the GC hopefuls. Even more so if Le Markstein is gifted to the break.

The battle will almost certainly open on the ascent of the Salève via the Col de la Croisette, a no-mercy climb of almost 5 kilometres at 11.2% average gradient. A first filter of maximum severity.

In the finale, the route heads to the Plateau de Solaison via a narrow road that snakes through the villages of the Bornes massif. It’s 11.3 kilometres at 9.1% average on relentlessly steep terrain. An explosive ramp that should suit Tadej Pogačar down to the ground.

The second day on Alpe d’Huez promises the queen mountain stage of the Tour, with 5,600 metres of total elevation gain. It arrives for the first time on the eve of the finale, pushing the demands to an extreme level.

The sequence of climbs is simply colossal: after cresting the Col de la Croix de Fer, the climbers must link the Col du Télégraphe and the roof of the race, the mythical Col du Galibier. It is tailor-made for a diesel like Jonas Vingegaard to gain time on the UAE Team Emirates leader.

From there, the final ascent to the Alpe d’Huez ski station comes on stage 20 but, unlike the previous day, it will be tackled via a virtually unused racing side, over the Col de Sarenne, only previously used in descent in 2013. Almost virgin territory, where history is still to be written.