Col de l'Iseran

Rising to 2 764 m in the French Alps, France, Col de l'Iseran is a Category 1 cycling climb. From Bessans, the toughest side climbs 23.7 km at 4.6% average — 1 082 m of ascent, pitching to 13.7% at its steepest. The steepest kilometre averages 12.7%, around km 21.8. It can also be climbed from Val-d'Isère (16.4 km at 5.7%): 2 measured approaches in all, each profiled kilometre-by-kilometre against Copernicus GLO-30 elevation data. On the Fiets scale it rates 6.7. Above the treeline the summit holds snow well into spring, so the dependable riding window runs roughly June to October.

RIDE THE CLIMB — FROM VAL-D'ISÈRE

KM 0.8

KM 1.3

KM 1.8

KM 2.3

KM 3.3

KM 4.4

KM 4.9

KM 5.4

KM 5.9

KM 6.4

KM 6.9

KM 7.9

KM 8.5

KM 9.0

KM 9.5

KM 11.0

KM 11.5

KM 12.6

KM 13.1

KM 13.6

KM 14.1

KM 14.6

KM 16.1

KM 16.4