Col de la Forclaz

Col de la Forclaz cycling climb profile

The Col de la Forclaz is a category 1 climb in France that asks for a controlled, sustained effort rather than a short punch. At 8.8 km with 663 m of net elevation gain, it averages 7.5 percent from a start elevation of 487 m to a summit elevation of 1150 m.

That average is the key number. A climb of this length at 7.5 percent is long enough to punish early enthusiasm, but steep enough that there is rarely much free speed. The listed maximum gradient of 12.83 percent also matters, because it tells you the climb is not simply a metronomic drag. Even if the overall average looks manageable on paper, the steepest ramps will force torque, cadence control, and gear choice into the equation.

How the gradient rides

From the available profile data, the safest way to read the climb is as a steady category 1 ascent with sharper pitches embedded inside it. The average gradient is high relative to the total length, so the climb should not be treated like a rolling road that happens to gain elevation. It is a proper climbing effort from bottom to summit.

The presence of a 12.83 percent maximum gradient changes the pacing logic. On a climb averaging 7.5 percent, a rider who sits too close to limit on the regular sections has very little room to absorb the steepest ramps. Those ramps will naturally push power above target, especially if cadence drops. The better strategy is to ride the main body of the climb just below the effort you think you can sustain, then let the steeper sections lift the effort briefly without turning them into attacks.

Pacing and gearing notes

Treat the Col de la Forclaz as a threshold-adjacent climb, not a series of anaerobic surges. If you pace by /glossary/ftp, the first priority is keeping the early effort controlled enough that the final part of the climb is still ridden under pressure rather than survived.

Practical approach:

• Start conservatively, because 8.8 km at this gradient gives a bad opening effort plenty of time to compound.
• Use the average gradient as your baseline effort guide, but gear for the 12.83 percent maximum, not for the 7.5 percent average.
• Avoid grinding early. If cadence collapses on the steepest ramps, the climb becomes muscular before it needs to.
• Stay seated where possible to smooth power, then stand only to reset cadence or clear the steepest pitches.

The gearing decision is straightforward: bring a true climbing gear. The average gradient is already demanding, and the maximum gradient is steep enough that riders without adequate low gearing will be forced into low-cadence torque work. That may be manageable for a short wall, but across a category 1 climb it raises the cost of every acceleration and makes pacing less precise.

What defines the climb

The defining feature of the Col de la Forclaz is the combination of length, consistent elevation gain, and a maximum gradient that sits well above the average. It is not extreme because of one isolated number. It is hard because the climb gives you nearly 9 km of real work, then asks you to handle steeper sections without overreacting.

Ride it with patience. The numbers point to a climb where discipline matters more than aggression: settle into the gradient, protect cadence, and save enough capacity to deal with the steepest ramps when they arrive.