The Tour de France is won and lost in the mountains, and the great mountains carry more than their altitude. A handful of climbs return to the race year after year — not because the map demands it, but because something happened on each of them that the sport has never been able to put down. Four stand above the rest. The 2026 route visits three of them: the Col du Tourmalet on stage 6, the Col du Galibier on the queen stage, and Alpe d'Huez on two consecutive days. The fourth, Mont Ventoux, sits this edition out — but no honest history of the Tour can leave it unmentioned.
Col du Tourmalet — where the Pyrenees entered the race
In 1910 the Tour did something close to reckless. For the first time it sent the riders over the high Pyrenees, onto roads that were little more than cart tracks, on bicycles with a single gear and no prospect of help if anything broke. The stage from Bagnères-de-Luchon to Bayonne crossed four passes, the Tourmalet among them, and finished over the Aubisque. When Octave Lapize hauled himself over the top, half-walking, he is said to have turned on the officials at the roadside and spat one word at them: assassins. Murderers.
He had a point. He also won the Tour that year, and the mountains stayed. The Tourmalet — 2,115 metres, seventeen kilometres of climbing from Sainte-Marie-de-Campan at better than seven percent — has since been used more often than any other high pass in the race's history. A giant steel statue of a straining rider, the Géant du Tourmalet, is carried to the summit every summer and planted there for the race to pass. It is the climb that taught the Tour what it could be: not a test of speed across flat country, but a test of who can keep producing power when the road tilts up and refuses to come back down.
It has staged some of the great solo rides. In 1969 Eddy Merckx crossed the Tourmalet alone with well over a hundred kilometres still to race, on a day he could have sat in and defended, and rode to Mourenx nearly eight minutes clear of everyone — an attack so gratuitous that his own staff thought he had lost his mind. For the modern rider the climb remains exactly what it was for Lapize and Merckx: a test governed by sustainable power, your functional threshold and the band just above it, and by fuel. Nobody has ever ridden the Tourmalet well on empty. In 2026 it headlines the queen stage of the Pyrenees, climbed after the Col d'Aspin and before the drag to Gavarnie-Gèdre, and the riders who pace it to a number rather than to the wheel in front of them will be the ones still there at the top.
Col du Galibier — the roof of the race
If the Tourmalet opened the Pyrenees, the Galibier opened the Alps. First crossed in 1911, at 2,642 metres by its hardest approach it is among the highest points the Tour ever reaches, and in 2026 it is the highest of all — the Souvenir Henri Desgrange, the prize awarded each year at the race's summit. Desgrange founded the Tour, and his monument stands near the top of the Galibier; the riders climb past the memory of the man who sent them up there in the first place.
The Galibier has decided Tours by the simple fact of its size. In 2011 the race finished on its summit for the first time, and Andy Schleck rode away from the field with around sixty kilometres still to race, a long-range attack of a kind the data age was supposed to have made impossible. He held it to the line. The lesson of the Galibier is the lesson of altitude and duration stacked together: it rewards the rider with the deepest aerobic engine and the discipline to ration it. In 2026 it comes on stage 20, after the Croix de Fer and the Télégraphe, with Alpe d'Huez still to climb afterward — the kind of day that is survived before it is won. The Galibier is also where the weather can decide a Tour on its own terms: even in July, snow, freezing fog and sleet have met the riders at its summit, and more than one race has been reshaped less by an attack than by the cold gnawing at exhausted men on the long descent toward the Col du Lautaret.
Mont Ventoux — the Giant of Provence
No climb in cycling looks like the Ventoux. Its upper slopes are stripped bare, a bald white scree of broken limestone that holds no trees, no shade and very little mercy. It stands alone above the plains of Provence, and on a hot day the heat comes off the rock like a furnace. The Tour has gone there since 1951, and the mountain has taken its price.
On 13 July 1967, Tom Simpson — Britain's first world champion, a rider of enormous courage and not much restraint — collapsed and died near the summit, his body overwhelmed by a combination of amphetamines, alcohol and savage heat. A memorial stands at the spot where he fell, and to this day riders and fans leave bottles and caps on it as they pass. It is the darkest landmark on any Tour climb, and a permanent argument against the idea that suffering is always noble.
The Ventoux has produced lighter legends too, and a few uneasy ones. In 1970 Eddy Merckx won the stage to the top and needed oxygen at the line, so deep had he gone. In 2000 the mountain hosted a duel between Lance Armstrong and Marco Pantani that ended in argument — Armstrong appeared to let the climber take the stage at the summit, then belittled him for it afterward, and within four years both men's reputations would lie in ruins for very different reasons. In 2016 ferocious wind forced the finish down to Chalet Reynard, a motorbike pile-up brought Chris Froome down in the yellow jersey, and the race leader — bike broken, no spare yet in sight — got off and ran up the road in his cleats, one of the strangest images the Tour has produced. In 2021 the race went over the Giant twice in a single stage, by two different roads, just to see who was left. The mountain does that. It turns the race into theatre, and occasionally into tragedy.
Alpe d'Huez — the amphitheatre
Alpe d'Huez is the most famous climb in the sport, and it earned the title on the road rather than on paper. Fausto Coppi won the Tour's first mountain-top finish there in 1952. The race left it alone for a quarter of a century, then brought it back for good in 1976, and it has hosted the sport's defining afternoons ever since. Each of its twenty-one numbered hairpins now carries the name of a stage winner; there are more famous winners than there are bends, so the names have begun to double up.
What sets the Alpe apart is the crowd. The climb is short by Alpine standards — 13.8 kilometres at a little over eight percent — but it is steep, close, and lined with hundreds of thousands of people who close to a corridor barely wide enough for the bikes; the Dutch corner, bend seven, is a furnace of orange smoke and noise that riders describe as both terrifying and intoxicating. It is a 40-minute effort ridden inside a wall of sound. Every kind of Tour drama has played out there: Marco Pantani set a climbing record in the 1990s that has never been bettered, though the era it belongs to means the figure is admired and distrusted in the same breath; and in 1986 Greg LeMond and Bernard Hinault, teammates and rivals, rode up it side by side and crossed the line hand in hand, a truce and a power play in one photograph. In 2026 the Tour finishes there on two consecutive days, stages 19 and 20, a first for any Grand Tour. The rider still standing on the second visit will be the one who refuelled, slept and rode the first one within himself.
What the mountains ask
Strip away the history and these four climbs ask the same three questions of every rider, professional or amateur. Can you hold a sustainable power for a long time — the engine built over months of aerobic work, not in a final sharp week. Can you pace to your own number instead of chasing a wheel that is faster than you. And can you keep fuel in the tank, because every one of these climbs has ended the day of someone who was fit enough but ran empty. The legends were made by riders who answered all three. The mountains have not changed the questions since.