Passo delle Cornelle

Overview

Passo delle Cornelle is a climb that gives you nowhere to hide. Over 14.4 km it averages a savage 11.96%, hauling you from a valley floor at 384 m up to a 2110 m summit. That is 1726 m of net elevation gain, with 1699 m of total ascent packed into a road that barely relents. There is a reason it carries the HC label — hors catégorie, the "beyond category" rating reserved for the hardest climbs in the sport. An 11.96% average sustained across nearly fifteen kilometres is not a warm-up, a tempo effort, or a climb you survive by feel. It is a full-hour test of your ceiling, and it demands respect before you turn a single pedal stroke.

How the Gradient Unfolds

The defining feature of Cornelle is not a single wall but relentlessness. With an 11.96% average and a max of 18.67%, the road rarely dips into anything resembling recovery. On most climbs a steep pitch is followed by a false flat where you catch your breath; here, the gradient hovers around double digits for kilometre after kilometre. The 18.67% ramps are the punctuation marks — moments where you stand, grind, and watch your speed collapse before settling back into the grinding 11.96% rhythm. Because the average is so high, even the "easy" stretches sit well above what most riders consider hard. Nearly 1700 m of climbing means the air thins noticeably by the upper slopes as you approach 2110 m, so a pace that felt sustainable low down will bite near the top.

Pacing Notes

This is a climb won or lost on discipline. At 11.96% average over 14.4 km, you are likely looking at close to an hour of climbing, which puts the effort squarely in threshold territory. Anchor your pacing to your FTP and refuse to exceed it early, no matter how good the legs feel on the lower slopes. The 18.67% ramps will force brief surges above threshold — that is unavoidable — so the goal is to keep the surges short and settle back down quickly rather than letting one steep pitch blow your whole ride apart. If you do not know your threshold number, run it through the FTP estimator before you commit. On a climb this long and this steep, a five percent pacing error compounds into a full-blown detonation before the summit.

Gearing

Do not under-gear this climb. An 11.96% average with 18.67% maximum pitches punishes anyone carrying a stack that is too tall. A compact 34-tooth chainring is the starting point, and even then your cassette choice matters enormously. A 34×32 is the bare minimum here — it will get you up the steady sections, but it leaves you spinning out of options when the road tips to 18.67%. For most riders, a 34×34 is the smarter call, giving you a genuine bailout gear that keeps your cadence off the floor and your knees intact. If your setup allows something easier still, use it. On Cornelle, spinning a low gear is not weakness — it is the only sustainable strategy.

Summary

Passo delle Cornelle is an uncompromising HC test: nearly fifteen kilometres of double-digit climbing to a high summit, with barely a metre of relief. Pace it by your threshold, gear it low, and treat every steep ramp as a moment to manage rather than attack.

Length: 14.4 km
Average gradient: 11.96%
Max gradient: 18.67%
Start: 384 m
Summit: 2110 m
Net gain: 1726 m
Total ascent: 1699 m
Category: HC