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EN ES FR IT
HC Where this climb is: SavoyAuvergne-Rhône-Alpes, France

Col de l'Iseran

Southern ascent from Bonneval-sur-Arc
GPX Profile
Length
13.8 km
Height gain
981 m
Average
7.1%
Steepest km
9.7%
Summit altitude
2764 m
Difficulty
230
2 ways up · this is the hardest Compare all 2

Elevation profile

1783 m → 2764 m Touch or hover to inspect
Elevation profile: Col de l'Iseran from Bonneval-sur-Arc
0–4% 4–6% 6–8% 8–10% 10–14% 14%+
Steepest km: km 13 at 9.7%

Climb analysis

Where the climbing is

0–4%
2.0 km
4–6%
1.5 km
6–8%
1.8 km
8–10%
7.5 km
10–14%
1.0 km
14%+
0.0 km

Hardest sustained

1 km · km 11.8–12.8
10.1%
2 km · km 11.4–13.4
9.4%
5 km · km 5.2–10.2
7.6%

Time to the top

1h 08 at 3 W/kg · 70 kg rider + 8 kg bike, no wind
How this is calculated

Kilometre by kilometre

Export CSV
Km Altitude Gradient 0–15%
1 1813 m 3.0%
2 1894 m 8.1%
3 1977 m 8.3%
4 2062 m 8.5%
5 2123 m 6.1%
6 2164 m 4.1%
7 2253 m 8.9%
8 2330 m 7.7%
9 2423 m 9.3%
10 2485 m 6.3%

Route map

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Directions
Satellite
Road surface not mapped yet Report a road type
No tunnels mapped Map a tunnel

About Col de l'Iseran

How long and how steep?
From Bonneval-sur-Arc, Col de l'Iseran is 13.8 km long and climbs 981 m at an average of 7.1%, to a summit at 2,764 m. Its steepest kilometre, km 13, averages 9.7%.
How long does it take?
At 3 W/kg it takes about 1 h 08 min to reach the top, at 4 W/kg about 53 min (70 kg rider, 8 kg bike, no wind).
What category is it?
It's an HC (hors catégorie) climb, with a difficulty score of 230. It's the hardest of the 2 ways up to Col de l'Iseran.
Where is it?
It's in Savoy, Auvergne-Rhône-Alpes, France.

How hard is 230?

Difficulty score is length × gradient, weighted for the steepest kilometre.

Puerto del Maravio, San Pedro 230
Covilha, A Frieira 230
Col de l'Iseran, Bonneval-sur-Arc 230
Col de Soulor, Argelès-Gazost 230
Puerto de Sahún, Plan 229

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Added by Thutmose · 1 contributor

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Col de L'Iseran From Val d'Isere · starts 10.1 km away
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