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Col du Grand Colombier
From Culoz. Length and gradient from an official source; times from the climb time calculator.
- Start
- Culoz
- 237 m
- Length
- 17.7 km
- Average gradient
- 7%
- Max gradient
- 11%
- Elevation gain
- 1,261 m
- Summit
- 1,498 m
Source: Route des Grandes Alpes, checked 15 October 2026.
South-east side from Culoz, one of four sides RGA lists. Summit 1,498 m; the sign at the col says 1,501 m (noted by RGA).
Time at your watts
| W/kg | Power | Time | Speed | VAM |
|---|---|---|---|---|
| 2.0 | 140 W | 2:03:21 | 8.6 km/h | 601 m/h |
| 2.5 | 175 W | 1:39:44 | 10.6 km/h | 744 m/h |
| 3.0 | 210 W | 1:24:08 | 12.6 km/h | 881 m/h |
| 3.5 | 245 W | 1:13:07 | 14.5 km/h | 1,014 m/h |
| 4.0 | 280 W | 1:04:55 | 16.4 km/h | 1,142 m/h |
| 5.0 | 350 W | 53:37 | 19.8 km/h | 1,383 m/h |
| 6.0 | 420 W | 46:12 | 23.0 km/h | 1,605 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 868 m (air density 1.106 kg/m³). Calculate yours / All climbs
Climb time calculator (prefilled) / All famous climbs