Col de la Charmette

Overview

Col de la Charmette is a Category 1 climb in France that earns its classification honestly. At 11.4 km long with an average gradient of 7.74% and 880 m of net elevation gain, it is a sustained, lung-burning effort from bottom to top. The total ascent figure of 1,422 m — notably higher than the net gain — signals that the road is not a clean ramp. There are undulations, short recoveries, and then renewed punishment.

Gradient Profile

The climb begins at 401 m elevation. That relatively low starting point means the approach can feel benign and deceptively manageable. Do not be fooled. The average of 7.74% across 11.4 km is already firmly in the territory that separates prepared climbers from unprepared ones.

The standout — and alarming — number is the 45.78% maximum gradient. That figure warrants direct attention: a 45% pitch is not a sustained ramp, it is a wall. Somewhere on this climb there is a ramp so steep that even highly trained riders will struggle to maintain forward momentum without the right gearing. A single short section at that gradient can shatter a rhythm built over several kilometers, and if you arrive at it already deep in the red, the consequences compound quickly.

The gap between total ascent (1,422 m) and net elevation gain (880 m) confirms there is meaningful vertical variation along the route — sections where the road briefly relents before pitching up again. These micro-recoveries are valuable but can also be psychologically tricky: it is tempting to accelerate on any flatter passage, which burns matches you will need when the gradient bites again.

Pacing Strategy

For most riders, the priority on Col de la Charmette is not going too deep in the opening third. With 11.4 km to cover at nearly 8% average, sustainable power output is everything. A useful reference point is your functional threshold power — targeting 75–85% of FTP for the full effort is a reasonable starting bracket for riders without prior knowledge of the climb's exact ramp distribution.

Key pacing principles:

• Start conservative. The climb is long enough that an early surge will cost you far more than it gains.
• Identify the steep section early. The 45.78% maximum gradient is extreme. If you have course notes or a GPS profile loaded, locate this pitch in advance and approach it with a gear already selected rather than scrambling mid-ramp.
• Use the undulations. Where the gradient eases relative to the average, spin up cadence and allow your heart rate to drop slightly. Do not attack these sections — treat them as controlled recovery.
• Final kilometers. Without a detailed pitch-by-pitch breakdown, assume the summit push to 1,281 m will be demanding. Reserve something.

Gearing Notes

The 45.78% maximum gradient is the critical gearing constraint here. Standard road compact gearing (50/34 chainring, 11-28 or 11-30 cassette) will leave most riders grinding or dabbing a foot on that ramp. A wide-range cassette — 32-tooth minimum, ideally 34 — is strongly advisable. Riders on 1x drivetrains should verify their lowest gear ratio before attempting the climb. If you are unsure how to calculate the gear inches or ratio you need, the FTP estimator can help contextualize the power demands, but gearing selection here is as important as fitness.

Summary

Col de la Charmette is a legitimate Category 1 climb that combines consistent gradient pressure with at least one savage ramp. The 11.4 km length and 880 m net gain demand aerobic capacity; the 45.78% maximum demands the right equipment and a clear head. Ride the first half within yourself, gear down before the steep section, and use every undulation as a recovery tool.