Col de Sarenne
12.8 km at 7.3%, summit at 1,999 m. HC.
- Length
- 12.8 km
- Average gradient
- 7.3%
- Height gained
- 934 m
- Summit
- 1,999 m
- Steepest km
- 12.9% measured on the route
- Category
- HC
The climb
Col de Sarenne climbs 12.8 km at an average of 7.3%, gaining 934 m to a summit at 1,999 m. That average is the least useful number on this page. The road alternates between steep pitches and stretches that let the gradient fall away, and pacing to the average means going too hard in the wrong places.
The hardest kilometre measures 11.9% and comes in the final third of the climb, and 7 kilometres of the ascent average more than 8%, one of them above 10%. It does not relent at the top: the final kilometre is still 11.9%.
At this height altitude starts to take a measurable edge off sustained power. In ProPace's stage data it appears on the single stage listed below.
Stages that climbed it
| Stage | Date | Summit at | Category |
|---|---|---|---|
| Tour de France 2026, stage 20: Le Bourg d'Oisans → Alpe d'Huez | 25 July 2026 | km 157.4 | HC |
Stages since 2024 whose route climbed to this summit, matched on ProPace's route data. Category as listed for that stage where the roadbook data is in the app.
In ProPace you ride the whole stage, this climb included, against a pro reference in the real wind from the day. How the simulation works is set out in How much slower than a pro are you?
Ride the stages over Col de Sarenne against a pro in ProPace. Free on iOS.
