Col de l'Iseran from Bonneval-sur-Arc
Col de l'Iseran from Bonneval-sur-Arc: 13.2 km at 7.4% average and 979 m of climbing, up to 2,764 m.
Opening Fermé l'hiver. La route du col est déneigée au printemps et rouvre en général entre fin mai et fin juin selon l'enneigement — vérifier l'état de la route avant de partir.
- Distance
- 13.2 km
- Elevation gain
- 979 m
- Elevation loss
- 13 m
- Average gradient
- 7.4 %
- Start altitude
- 1,791 m
- Road
- Departmental road
- Surface
- Paved throughout
- Steepest 500 m
- 12.0 %
- Hardest 2 km
- 9.9 %
- Hardest kilometre
- km 12 · 10.1%
- Above 8%
- 6.0 km (46% of the climb)
- Difficulty index
- 8.8 Hard
FIETS index: Δaltitude² / (10 × distance) + max(0, summit altitude − 1,000) / 1,000, lengths in metres. How this index works (article in French)
How long does it take?
| Level | Estimated time | Average speed |
|---|---|---|
| 2.0 W/kg — 140 W | 1h39 | 7.9 km/h |
| 3.0 W/kg — 210 W | 1h08 | 11.7 km/h |
| 4.0 W/kg — 280 W | 52 min | 15.2 km/h |
Estimated for a 70 kg rider on a 9 kg bike, in still air, at a steady effort and without stopping. Wind, a stop at the fountain or a wheel to sit on move these figures by several minutes.
The route
Climb profile
- 10% and above
- 8 to 10%
- 6 to 8%
- 4 to 6%
- under 4%
Kilometre by kilometre
| Km | Gradient | Altitude at the top of the km |
|---|---|---|
| 1 | 8.7 % | 1,878 m |
| 2 | 8.4 % | 1,962 m |
| 3 | 8.3 % | 2,045 m |
| 4 | 7.8 % | 2,123 m |
| 5 | 1.6 % | 2,139 m |
| 6 | 8.6 % | 2,225 m |
| 7 | 6.9 % | 2,294 m |
| 8 | 9.2 % | 2,386 m |
| 9 | 9.2 % | 2,478 m |
| 10 | 3.5 % | 2,513 m |
| 11 | 6.2 % | 2,575 m |
| 12 | 10.1 % | 2,676 m |
| 13 | 7.7 % | 2,752 m |
| 14 (partial) | 2.9 % | 2,757 m |
Download the GPX track All climbs of this col
The other climbs of this col
- From Val-d'Isère 15.7 km · 5.8 %
Frequently asked questions
How long is the climb to Col de l'Iseran?
The hardest climb of Col de l'Iseran, from Bonneval-sur-Arc, is 13.2 km long for 979 m of ascent, i.e. 7.4% average.
What is the steepest part of Col de l'Iseran?
The steepest 500 m sits at 12.0%, and the hardest kilometre is the 12th, at 10.1%.
How long does it take to climb Col de l'Iseran from Bonneval-sur-Arc?
Col de l'Iseran from Bonneval-sur-Arc takes about 1h08 at 3.0 W/kg, i.e. 11.7 km/h on average. The page gives three levels and their assumptions.
Is Col de l'Iseran open all year round?
Fermé l'hiver. La route du col est déneigée au printemps et rouvre en général entre fin mai et fin juin selon l'enneigement — vérifier l'état de la route avant de partir.
Col de l'Iseran: add this col to your collection
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