Passo del Cornà

Overview

Passo del Cornà is an HC-category climb in France, and it earns that rating over just 11.5 km. From a start elevation of 0 m to a summit at 1,028 m, it delivers a net elevation gain of 1,028 m at an average gradient of 8.97%. That is a relentless number for a climb this length: there is no long false-flat approach padding the average down, and no gentle summit run-in to recover on.

The number that reframes the whole effort, though, is total ascent. The climb gains 1,028 m net but racks up 1,318 m of total ascent. That 290 m gap means you climb the equivalent of an extra small col that you then give back on descents and dips along the way. Every metre you descend mid-climb is a metre you have to re-earn, and re-earning it at 8.97% average is expensive. Budget for the 1,318 m of actual vertical work, not the 1,028 m the map advertises.

How the Gradient Unfolds

An 8.97% average on an undulating profile is a liar. With 290 m of descent folded into the ascent, the sustained ramps must run well above the average to compensate for every flat and downhill metre. The steepest pitch reaches 35.83% — a wall you will not spin over smoothly.

• Short recovery or descending sections that force you back onto the pedals to hold momentum
• Repeated re-climbs where the road drops then rears back up, each one steeper than the average implies
• A steepest ramp of 35.83% that demands your lowest gear and a deliberate line

Pacing Notes

On a steady climb you can pace to even speed. Here you cannot — the undulation makes even speed impossibly costly, because holding pace over the 35.83% wall would spike your power into the red. Pace to even effort instead. Meter your sustainable power output across the flats and descents, then accept slower speed on the steep re-climbs rather than forcing the pace. Know your ceiling before you start: run the numbers through the FTP estimator so you climb to a target, not to feel.

Gearing

The 35.83% steepest ramp governs your setup. Do not attempt this on standard road gearing. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 at minimum, and 34×34 if you can run it. Those pitches will find the limit of whatever you bring, and there is no shifting your way out mid-wall. Check your chainset and cassette before the ride, not at the trailhead.

Summary

• Length: 11.5 km
• Average gradient: 8.97%
• Maximum gradient: 35.83%
• Net elevation gain: 1,028 m
• Total ascent: 1,318 m
• Category: HC

Passo del Cornà is a short climb with a long climb's workload. Respect the 1,318 m of total ascent, pace to effort, and gear for the wall — do that, and the HC rating becomes a challenge rather than a crisis.