Col d'Izoard
From Briançon. Length and gradient from an official source; times from the climb time calculator.
- Start
- Briançon
- 1,209 m
- Length
- 19.2 km
- Average gradient
- 6.5%
- Max gradient
- 9%
- Elevation gain
- 1,170 m
- Summit
- 2,360 m
Source: Route des Grandes Alpes, checked 14 October 2026.
North side from Briançon. Office de Tourisme Briançonnais lists about 6% average and ~1,150 m gain for the same side; this page uses Route des Grandes Alpes (19.2 km, 6.5%, 1,170 m).
Time at your watts
| W/kg | Power | Time | Speed | VAM |
|---|---|---|---|---|
| 2.0 | 140 W | 2:04:58 | 9.2 km/h | 598 m/h |
| 2.5 | 175 W | 1:41:09 | 11.4 km/h | 739 m/h |
| 3.0 | 210 W | 1:25:25 | 13.5 km/h | 875 m/h |
| 3.5 | 245 W | 1:14:18 | 15.5 km/h | 1,006 m/h |
| 4.0 | 280 W | 1:06:03 | 17.4 km/h | 1,131 m/h |
| 5.0 | 350 W | 54:40 | 21.1 km/h | 1,367 m/h |
| 6.0 | 420 W | 47:12 | 24.4 km/h | 1,583 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 1,784 m (air density 0.989 kg/m³). Calculate yours / All climbs
Climb time calculator (prefilled) / All famous climbs