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Col de l'Iseran
From Val-d'Isère. Length and gradient from an official source; times from the climb time calculator.
- Start
- Val-d'Isère
- 1,850 m
- Length
- 16 km
- Average gradient
- 5.8%
- Max gradient
- 8%
- Elevation gain
- 929 m
- Summit
- 2,764 m
Source: Route des Grandes Alpes, checked 14 October 2026.
North side from Val-d'Isère (not the full Bourg-Saint-Maurice approach). Summit 2,764 m; roadside panel says 2,770 m (noted by RGA).
Time at your watts
| W/kg | Power | Time | Speed | VAM |
|---|---|---|---|---|
| 2.0 | 140 W | 1:34:06 | 10.2 km/h | 591 m/h |
| 2.5 | 175 W | 1:16:23 | 12.6 km/h | 728 m/h |
| 3.0 | 210 W | 1:04:42 | 14.8 km/h | 859 m/h |
| 3.5 | 245 W | 56:28 | 17.0 km/h | 985 m/h |
| 4.0 | 280 W | 50:21 | 19.1 km/h | 1,104 m/h |
| 5.0 | 350 W | 41:55 | 22.9 km/h | 1,326 m/h |
| 6.0 | 420 W | 36:23 | 26.4 km/h | 1,528 m/h |
Model estimate in calm air at steady power (Martin et al. 1998). 70 kg rider + 8 kg bike, tops position (CdA 0.358), Crr 0.0032, 15 °C, air density at the climb's mid-elevation. Mid-elevation 2,307 m (air density 0.927 kg/m³). Calculate yours / All climbs
Climb time calculator (prefilled) / All famous climbs