La Marmotte Sportive: The Ultimate Guide From a Local Guide

177 kilometres. 5,000 metres of climbing. Four legendary cols. Up to 7,000 riders on the start line in Bourg d’Oisans every summer, and most of them won’t finish the way they expect to. La Marmotte is one of the toughest sportives on the cycling calendar, and the reasons it breaks people aren’t the ones you’d guess.

I’ve been guiding cyclists on this route since 2008, and it still teaches me something new every year. In the video below, I break down the entire ride into four chapters and show you exactly where it goes wrong for most riders, and what to do about it.

Watch the full breakdown

https://youtu.be/pB0JeNogwKw

Why most riders get La Marmotte wrong

On paper, the route looks beautiful. The Col du Glandon. The Telegraphe. The Galibier. A finish on the 21 bends of Alpe d’Huez. In reality, La Marmotte isn’t a climbing test. It’s a pacing test, a strategy test, and above all a mental test. The climbs themselves aren’t the problem. It’s the order they come in, the descents between them, and the false flats that drain riders without them realising.

The ride splits naturally into four chapters, each with its own trap.

Chapter 1: The opening battle

The Col du Glandon looks manageable on paper. It isn’t. There’s a hidden second climb, a steep crux most riders haven’t planned for, and a free water source almost nobody uses. Get this chapter wrong and the rest of the day unravels.

Chapter 2: The steady hold

The Col du Telegraphe feels like a recovery climb after the Glandon. That’s the trap. What happens between the Glandon descent and the foot of the Telegraphe matters more than the climb itself, and there’s one specific spot near Saint-Jean-de-Maurienne that ends people’s day every single year.

Chapter 3: The epic test

The Col du Galibier is the highest point of the ride and the moment La Marmotte separates the smart riders from the reckless ones. The last two kilometres aren’t the same climb as the first fourteen. The weather at the summit isn’t the weather in the valley. And the descent that follows hides a problem most riders never see coming.

Chapter 4: The final showdown

The 21 bends of Alpe d’Huez. By the time you arrive, you’ve already ridden 156 kilometres and climbed almost everything that mountain ranges can throw at you. Whether you finish strong or fall apart was decided hours earlier, in chapters you’ve already forgotten.

What’s covered in the video

The full video walks through every chapter in detail, including the local knowledge you won’t find on the official route profile: where the free water fountains are, which feed station to skip, where to bring a jacket and where to ditch it, and the two reasons the Lautaret descent is harder than it looks. There’s also a free downloadable La Marmotte map mentioned in the video that marks the permanent water stops, bike shops and cafes along the route.

Plan your trip to the Oisans

If you’re coming to ride La Marmotte, or just spending time in the area, there’s a full Cycling in the Oisans playlist covering everything from flat valley warm-up rides to the hidden gravel cols nobody talks about. The Alpe d’Huez 21 bends video and the dedicated 8 Mistakes Most Riders Make on La Marmotte are both worth watching before race day.

Frequently Asked Questions

How long is La Marmotte?

La Marmotte is 177 kilometres with approximately 5,000 metres of climbing.

What climbs are in La Marmotte?

The Col du Glandon, the Col du Telegraphe, the Col du Galibier, and a final ascent of Alpe d’Huez.

How hard is La Marmotte?

It’s one of the hardest sportives in cycling. The difficulty comes less from any single climb than from the order they arrive in, the long valley transitions, the altitude on the Galibier, and a 21-bend finish to Alpe d’Huez after 156 kilometres already in the legs.

Where does La Marmotte start and finish?

It starts in Bourg d’Oisans and finishes at the top of Alpe d’Huez.

How many riders take part?

Up to 7,000 cyclists ride La Marmotte each year.

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    Part of the La Marmotte Preparation Series

    This article is Part 3 of a 3-part La Marmotte guide.