Col du Coq

What to Expect on the Col du Coq

The Col du Coq earns its Hors Catégorie rating honestly. Over 14.3 km, the road climbs from 225 m at the base to a summit of 1,458 m, delivering 1,233 m of net elevation gain and 1,640 m of total ascent. That discrepancy between net and total ascent matters — the road undulates enough in places to claw back some altitude before punishing you again, which makes raw power management more complicated than a clean number would suggest.

The 8.6% average gradient is high enough to keep you in a sustained, uncomfortable effort from the first kilometre. There is no extended flat run-in to ease you into the work. Treat the average as a floor, not a ceiling — stretches well above it are frequent enough to shatter any attempt at a fixed tempo.

Gradient Breakdown

The headline figure that defines this climb is the 37.94% maximum gradient. That is not a ramp you negotiate at race pace; it is a wall that can stop an under-geared rider almost entirely. Short as it may be in distance, hitting it with accumulated fatigue in the legs and no gear left to shift into will end a clean ride.

A practical way to think about the Col du Coq:

• Lower slopes: The climb starts steep early. With an average of 8.6% over the full 14.3 km, even the more moderate sections are working your legs. Do not let an early section that feels manageable tempt you into overcooking the effort.
• Mid-section: Gradient variation continues throughout. The total ascent figure of 1,640 m versus a net gain of 1,233 m confirms there are genuine descents or flatter false-flat recoveries embedded in the climb — use them deliberately to bring heart rate down and restore leg tension, rather than letting the mind switch off.
• Upper slopes: The closer you get to the 1,458 m summit, the more the gradient can spike. The maximum pitch of nearly 38% sits somewhere on this climb — prepare for it mentally and hold something in reserve.

Pacing Notes

For a climb with an 8.6% average and this much total ascent, the math on FTP-based pacing is straightforward but the execution is not. A fixed-percentage effort strategy breaks down on a road with this kind of gradient variance.

Recommended approach:

• Target a power output around 85–90% of threshold for the sustained sections, accepting that the steep pitches will briefly push you above that ceiling.
• On the near-38% section, the goal shifts from power output to simply maintaining forward motion. Standing, grinding, and protecting your cadence matters more than any watt target at that gradient.
• If you are using a FTP estimator to benchmark effort, factor in that 1,640 m of climbing — not just the net gain — when calculating expected duration and caloric demand.

Gearing

This is not a climb to attempt on standard road gearing unless your legs are genuinely exceptional. A maximum gradient of 37.94% at the end of 14 km of sustained climbing is an argument for the lowest gear you can run without mechanical compromise.

• Compact chainset with a 32t or 34t cassette sprocket is a sensible minimum.
• If your bike runs a 1x drivetrain, confirm your lowest ratio before the start — remedying it on the side of the road mid-climb is not a realistic option.
• Cadence discipline matters more than on average climbs. Spinning out a gear early to conserve muscular endurance will pay off when the gradient peaks.

The Col du Coq is a genuine HC-category test. Respect the numbers going in, pace conservatively through the first half, and keep one gear in reserve for the worst the road can throw at you.