From Ruffieux
Minor departmental road
Col du Clergeon, 979 m, in Haute-Savoie. Main climb: 8.3 km at 8.8% average, 730 m of climbing from Ruffieux.
Figures for the main climb (From Ruffieux). The other climbs are further down.
| Main climb | Distance | Elevation gain | Elevation loss | Average gradient | Steepest 500 m | Difficulty index |
|---|---|---|---|---|---|---|
| From Ruffieux | 8.3 km | 730 m | — | 8.8 % | 13.6 % | 6.4 Sustained |
| From Lornay | 12.8 km | 713 m | 61 m | 5.6 % | 11.2 % | 3.3 Moderate |
Scroll the table sideways to see every column.
Minor departmental road
Minor departmental road
2 ascents proposed here — other ways up this col remain possible.
Distances and elevation gains derived from the OpenStreetMap road network and a digital terrain model, measured on the very profile shown here.
Figures computed on 7 September 2026.
Straight-line distances, not road distances. The cols a climb actually rides over are listed above.
The hardest climb of Col du Clergeon, from Ruffieux, is 8.3 km long for 730 m of ascent, i.e. 8.8% average.
The steepest 500 m sits at 13.6%, and the hardest kilometre is the 4th, at 11.7%.
Sleipnir recognises the cols you cross from the GPS trace of your rides: the col ticks itself off the day you ride over it.
Create an accountFree during the beta, no card required — places are limited.
A Polar watch syncs on its own; with any other watch, import your GPX or TCX files.