Altigraphs
HC Isère, France

Col du Lautaret

Western ascent from Le Clapier d'Auris
Length
33.7 km
Height gain
1309 m
Average
3.9%
Steepest km
10.7%
Summit altitude
2054 m
Difficulty
351
4 ways up · this is the hardest Compare all 4
Show all 4 ways up

Elevation profile

744 m → 2054 m Touch or hover to inspect
0–4% 4–6% 6–8% 8–10% 10–14% 14%+
Steepest km: km 25 at 10.7%
4 short sections look like survey errors (hatched) — usually a tunnel or a bridge, measured from the terrain above or below the road. They are left out of the steepest-km figure.

Climb analysis

Where the climbing is

0–4%
14.3 km
4–6%
9.3 km
6–8%
7.7 km
8–10%
1.5 km
10–14%
0.3 km
14%+
0.8 km

Hardest sustained

1 km · km 23.9–24.9
12.2%
2 km · km 0.6–2.6
7.8%
5 km · km 26.8–31.8
6.2%

Time to the top

2h 07 at 3 W/kg · 70 kg rider + 8 kg bike, no wind

Kilometre by kilometre

Export CSV
Km Altitude Gradient 0–15%
1 872 m 12.8% ? Includes a suspected survey error
2 888 m 1.5% ? Includes a suspected survey error
3 958 m 7.0%
4 996 m 3.8%
5 949 m −4.7%
6 927 m −2.2%
7 961 m 3.4%
8 1011 m 5.1%
9 1054 m 4.3%
10 1198 m 14.4% ? Includes a suspected survey error

Route map

Two fingers to pan
Road surface not mapped yet Report a road type
No tunnels mapped Map a tunnel

At the summit now

Updated 17 min ago
10° Clear Feels like 6° · 2054 m
Wind 3 km/h W

How hard is 351?

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

Help complete this climb

Riders’ photos, notes and corrections make every profile better.

Add a photo No photos yet — the last kilometre, the summit sign Write a rider note Traffic, water, where it really bites Map a tunnel 4 short sections look like survey errors Report a road type Not mapped yet — paved, unpaved or cobbles
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Added by altigraphs · 1 contributor

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