• Distance 57 km
  • Elevation gain 1980m
  • Difficulty
  • Epic rating

An unforgettable loop in which you get to ride both sides of the mythical Alpe d’Huez.

Halfway up Alpe d’Huez you reach La Garde-en-Oisans and cut along a stunning vertiginous balcony road.

The route drops down to the Lac du Chambon before a beautifully quiet and tough climb to the Col de Sarenne.

From there you follow the little-known gem of a back route to Alpe d’Huez.


All metrics in this article are approximate.

Col De Sarenne loop highlights

The Auris balcony road (also known as the “Route de la Roche”), runs between La Garde-en-Oisans and Balme de Auris. It’s staggering. It’s perched on a cliff above the Romanche valley and has fabulous views over Bourg d’Oisans far below.

The first 40 seconds of the video above give you an idea of what it’s like, but you’ll have to ride it to appreciate the incredible views.

Avoid if you don’t like heights!


Route notes

1. Bourg d’Oisans to Le Freney d’Oisans: 0-18.5 km

It’s an all-too-short, flat kilometre from Bourg d’Oisans to the base of Alpe d’Huez. The road quickly ramps up as you hit Alpe d’Huez’s infamous hairpins: it’s a 9.5% average gradient between the base and bend 16 in Garde en Oisans, where you turn off for the breathtaking balcony road.

From there it’s a twisty descent to Freney d’Oisans.

2. Le Freney d’Oisans to Col de Sarenne: 18.5-33.5 km

You cross the mighty Lac du Chambon and quickly turn off the main road into the Ferrand valley, on the tiny D25. Steel yourself for a tough ascent through four hairpins, up to the village of Mizoën. It’s then a straightish climb up through Clavans Le Bas until the hairpins kick in at about 27km, as you approach the summit of the Col de Sarenne (1,999m).

We did the route at dusk and had the road to ourselves. It was magical.

3. Col de Sarenne to Bourg d’Oisans: 33.5-57 km

From the summit of the Col de Sarenne, it’s a fantastic downhill run all the way home.

The 9 kilometres between Col de Sarenne and Alpe d’Huez village are remote and spectacular.  Coming into Alpe d’Huez from the peaceful solitude of the Col de Sarenne feels pretty special as it’s so little known, compared to the route up the 21 hairpins from Bourg d’Oisans.

Turn off to Auris balcony roadTurn off in Garde en Oisans to Auris en Oisans
Col de SarenneCol de Sarenne
Cycling Col de SarenneViews from the little used roads behind Alpe d’Huez

Café stops

Your refuelling options are quite limited. Bourg d’Oisans and Alpe d’Huez village obviously have lots of options. Other than that, La Freney d’Oisans is probably your best bet (at the very least, there’s a petrol station and small shop there).

There are fountains with drinking water at various points along the route, including:

  • La Garde-en-Oisans, switchback 16, in the church square
  • La Carte-d’Haute (La Garde-en-Oisans): next to the road
  • Les Chatains (Auris-en-Oisans): in the village, just below the road
  • Le Freney-d’Oisans: in the village of Perrier
  • Clavans-le-Bas: on the way out of the village, near the Auberge
  • Mizoën: on the way out of the village
  • Huez: in the village
  • Alpe d’Huez: Place Paganon, near the tourist office


This ride starts and finishes in Bourg d’Oisans. You can find our accommodation suggestions in our guide for cyclists on where to stay in/near Alpe d’Huez.


  • There are three tunnels, carved out of the cliff face of the Auris balcony road. Bring lights and remember to take your sunglasses off.
  • If you want to ride up all of Alpe d’Huez (rather than just the first third), you can do this route in reverse. We haven’t suggested doing it that way because we prefer the less obvious Col de Sarenne route to the top of Alpe d’Huez.
  • Read our tips for cycling in the Alps before you set out.

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Clare Dewey

Clare Dewey is a cyclist with a passion for travel. She set up epicroadrides.com in 2018 to help make it easy for cyclists to explore the world by bike. Today her mission is still inspiring cyclists to discover new places on two wheels – and doing what she can to make sure they have the best possible time while they’re there. Clare has visited 50+ destinations around the world, many of them by bike.

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4 Responses to “Col de Sarenne,
French Alps”

  1. The Sarenne climb is lovely and the way to do the loop is to climb Sarenne rather than descend. It’s a bit gravelly and the road surface isn’t great for a fast descent.

    • Totally agree – beautiful road but much better to climb the Sarenne than descend it…

  2. hi Clare,
    why do say you prefer the Col de Sarenne route to the top of Alpe d’Huez? is it the other cyclists, traffic or just the shear beauty of the route?

    • A combination of all of the above! AdH you have to ride of course, but Col de Sarenne is the connoisseur’s choice!

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