Col de la Croix de Fer
A very long, irregular climb from the Le Bourg-d'Oisans side: over 30 km with a short descent in the middle and steep pitches, to 2,067 m. It is the route of the famous La Marmotte sportive.
- Start: Le Bourg-d'Oisans
- Length: 32.1 km
- Elevation gain: 1,561 m
- Average gradient: 4.2%
- Max gradient: 13%
- The Tour de France first crossed the Croix de Fer in 1947.
- La Marmotte uses this side; about 2.5 km below the top the road forks from the one to the Col du Glandon.
- The Tour also often climbs it from Saint-Jean-de-Maurienne, on the other side.
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