No climb in cycling carries the weight that Alpe d’Huez does. Twenty-one hairpin bends stacked up a mountainside above the Romanche valley, a road that lifts a bike race from the valley floor to a ski station at 1,850 metres — it is not the longest climb the Tour de France uses, nor the highest, nor even the steepest. It is simply the one that matters most. But there is a detail most fans miss: there is not one Alpe d’Huez, there are two. There is the famous face, the amphitheatre of twenty-one numbered bends that everyone knows, and there is a wild, half-forgotten back road over the Col de Sarenne that the Tour has only rarely dared to use. This is the whole mountain — both roads, the numbers, the bends, and the seventy years of history that turned a road to a ski resort into cycling’s most famous piece of tarmac.
Where it is, and what it climbs
Alpe d’Huez sits in the Oisans, in the French department of Isère, deep in the western Alps. The mountain it climbs is a great block of rock rising off the floor of the Romanche valley, and stacked on top of that block is a purpose-built ski resort, carved into the slopes in the twentieth century. Two very different roads climb to that plateau. One goes up the western face directly from the town of Bourg-d’Oisans — the famous one, the road the Tour almost always uses. The other loops in from the east, over a high, lonely pass called the Col de Sarenne, and reaches the resort by the back door. They could hardly be less alike, and understanding the mountain means understanding both.
Route one: the classic climb from Bourg-d’Oisans
This is the Alpe d’Huez of legend. The road leaves Bourg-d’Oisans on the valley floor at 725 metres and climbs 13.8 kilometres at an average of 8.1 percent to the summit at 1,850, gaining well over a thousand metres of altitude through twenty-one hairpin bends stacked one above the other across the face of the mountain. There is no easing-in: the valley gives way to the wall almost immediately, and by the first bend a rider is already deep into the hardest gradients of the whole climb. Stand in Bourg-d’Oisans and look up, and you can see the entire road you are about to suffer on, zig-zagged up the rock above your head. This is the road the Tour de France reaches for when it wants a stage that everybody will remember.
The ramps: where the race is actually won
The cruelty of the classic side is front-loaded, and every rider who has raced it knows exactly where. The opening four kilometres out of Bourg-d’Oisans are the hardest of the whole climb: gradients sitting around ten percent and touching thirteen at their worst, with no soft section to hide in and no rhythm to settle into. This is the stretch that sorts the race. Attack too hard here and you pay for it all the way to the summit; sit too passively and the leaders are gone before the road ever eases. By the time the gradient relents into the middle bends, the selection has usually already been made — and in the final kilometres, up through the resort itself, it is fatigue rather than steepness that finishes riders off. Feel where it bites:
That shape is why the classic Alpe rewards a particular kind of rider: one who can absorb a violent opening and still have something left near the top. It punishes a bad first kilometre more than almost any climb in the sport.
Thirteen kilometres. Twenty-one bends. One place a Tour gets decided.
the first four kilometres are the steepest — and where the leaders sort themselves out
The 21 hairpins, and Dutch Corner
The bends are the mountain’s signature. There are twenty-one of them on the classic side, numbered in descending order from 21 at the foot to 1 near the top, and each carries a plaque naming a past Tour de France stage winner — so many now that the names have begun to double up on the boards. The most famous of them is bend 7, better known as Dutch Corner, a shrine to the years when Dutch riders owned the climb: they won eight of the first fourteen Tour stages to finish here, and their fans have never left. On race day the corner is a wall of orange smoke, beer and noise, one of the loudest few metres in all of sport; bend 10 answers it as Irish Corner. To climb Alpe d’Huez on a Tour afternoon is to ride up through a corridor of people who have waited days for the thirty seconds it takes you to pass.
Route two: the Col de Sarenne, the wild side
Now the other road — the one the postcards forget. Instead of attacking the western wall, this route comes at the mountain from the east, starting down at the Barrage du Chambon beside the Lac du Chambon at around 1,041 metres and climbing the Col de Sarenne. It is a different animal entirely. Where the classic side is wide, smooth and lined with grandstands, the Sarenne road is narrow, rough and often empty, a thread of tarmac across an arid, treeless mountainside. It is roughly 12.8 kilometres to the col at a shade under eight percent on average — but the numbers hide the sting, because unlike the classic side this climb saves its worst for last: after a steep opening ramp and a wooded middle section, the final four kilometres to the col rear up to around 9.5 percent, exposed and unrelenting, cresting a lonely summit at 1,999 metres. From there the road tips over and drops, on surface so poor it is barely raceable, before rolling the last few kilometres across to the Alpe d’Huez plateau. It is the same mountain, reached the hard, strange way.
Two climbs, one summit
Put them side by side and the contrast is the whole story. The classic west face is a stage — a set-piece the whole sport knows by heart, decided in its brutal opening kilometres in front of hundreds of thousands of fans. The Sarenne is a statement — a wild, high, awkward road the organisers reach for only when they want to do something the Tour has never done before. Both end on the same plateau; almost everything else about them is opposite.
The history that made it
The Tour first climbed Alpe d’Huez in 1952, and it could hardly have anointed the mountain more perfectly: Fausto Coppi won the stage and took the yellow jersey, the sport’s greatest rider of the age crowning cycling’s soon-to-be greatest climb. Then, strangely, the race forgot about it — the Alpe did not return until 1976, when Joop Zoetemelk won and the modern legend began in earnest. What followed was the Dutch era that gave Dutch Corner its name, then a run of days that have entered the sport’s permanent memory: Bernard Hinault and Greg LeMond cresting the climb hand in hand in 1986, a truce and a power struggle disguised as a gift; Marco Pantani flying up it in 1997 in a still-unbeaten 37 minutes and 35 seconds, a mark that has stood for nearly three decades, though the climb was measured slightly longer then. The wild side has had its rare moments too: in 2013 the Tour climbed the classic Alpe twice in a single stage and sent the race plunging down the broken Sarenne road in between, a descent that helped decide the day. Tom Pidcock won on the classic side in 2022. And in 2026 the mountain made history of its own, hosting the finish of two stages in the same Tour for the first time ever — Stage 19 up the classic road, and Stage 20 arriving over the Col de Sarenne, the first time a Tour stage had ever finished from that side — with Tadej Pogačar running down a huge breakaway to win in yellow on the first of them. For that stage, see our Stage 19 report.
Why it matters
Plenty of climbs are harder on paper, and the Sarenne is arguably one of them. What Alpe d’Huez has that none of them can buy is memory: seventy years of decisive afternoons layered onto the same bends, so that every rider who attacks here is racing not just the gradient but everyone who ever attacked before them. That is the real altitude of the place — not the 1,850 metres on the summit sign, but the weight of what has happened on the way up. When the Tour points its race up these switchbacks, it is not choosing the toughest road available; it is choosing the one where greatness is easiest to recognise. So when the peloton next hits the foot of the Alpe and the first ten-percent ramp bites, ask yourself the only question the mountain has ever really posed: who is brave enough to spend everything in the first kilometre — and who will still be standing at bend one?
Sources
- BikeRadar — Alpe d’Huez at the Tour de France, in numbers
- ProCyclingUK — How to cycle up Alpe d’Huez: route, gradients and pacing
- Bike Rebel — Alpe d’Huez: beyond the 21 bends (the Sarenne approach)
- Climbfinder — Col de Sarenne from Lac du Chambon: profile and gradients
- Cycling Locations — Alpe d’Huez climb data (13.8 km, 8.1%)
Related reading
CyclingFreePress is a cycling news digest. This guide summarises publicly reported information about the Alpe d’Huez climb, its two approaches and its Tour de France history; the profiles and per-kilometre gradients are CFP schematics keyed to the roadbook rather than surveyed measurements. Distances and records are as reported.