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Col de la Croix de Fer - Col du Glandon

Description

A beautiful tour in the Eau d'Olle Valley that will lead you to the borders of Oisans on the Savoy side. The climb is steep up to the Lake Grand Maison. Your calf muscles will certainly remember some of the sections. But once on the top, what a joy!

Itinerary no. 14 of the “Cycling in Oisans” guide (Oisans Tourisme)

Departure / Arrival: Bourg d’Oisans 720 m
Time: 3 h 45
Distance (R/T): 80 km
Highest point: 2071 m
Lowest point: 710 m
Total ascent: 2086 m
Max. gradient: 12%

Map: Michelin Local Map no. 333 Isère, Savoie

ITINERARY
From Bourg d’Oisans, follow the D1091 towards Grenoble.
In Rochetaillée follow the route to “Allemond / Col du Glandon - Col de la Croix de Fer”.
On leaving Allemond, climb up 2 hairpin bends to get to the top of the Verney dam. At the end of the dam, the route towards “Col du Glandon - Col de la Croix de Fer” will be signposted taking you alongside the Lake Verney.
At the end of the lake, you will start a steep climb up to Rivier d'Allemond.
At Rivier, you can take a little breather before to dropping down to the bottom of the valley and then attacking a new strenuous climb up to Lake Grand Maison.
Once arrived at the lake, the steep-sided valley gives way to beautiful alpine pastures. The ride will be more easy-going from here to the Col de la Croix de Fer (2067 m).
After enjoying the view of the Aiguilles d'Arves, go back to Bourg d'Oisans by the same way.

LITTLE BONUS: Col du Glandon
On the way back, turn right towards Col du Glandon.

Distance (R/T): 440 m
Time: 5 min
Total ascent: 22 m

Technical Information

Racing biking
Difficulty
Hard
Duration
3h45mn
Dist.
80 km
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Altimetric profile

Starting point

Mas du Plan , 38520   Le Bourg-d'Oisans
Lat : 45.054787Lng : 6.031618

Date and time

  • From 01/05/2026 to 15/11/2026
  • From 01/05/2027 to 15/11/2027

Additional information

Updated by

Oisans Tourisme - 25/02/2026
www.bike-oisans.com
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Environments

Mountain location

Open period

From 05/01 to 10/31 : open daily.
Learn about the opening date of the path.

Contact

Phone : 04 76 80 03 25

Email : info@oisans.com

Website : https://www.bike-oisans.com

Topo guides and map references

Topo guides references :
Itinerary no. 14 of the “Cycling in Oisans” guide (Oisans Tourisme)

Map references :
Michelin Local Map no. 333 Isère, Savoie

Reception complements

permanent time trial route. www.bike-oisans.com

Data author

Image Oisans Tourisme
proposed by Oisans Tourisme
1 bis rue Humbert 38520 Le Bourg d'Oisans France

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Caution!
We have no information on the difficulty of this circuit. You may encounter some surprises along the way. Before you go, please feel free to inquire more and take all necessary precautions. Have a good trip! 🌳🥾