Col d'Ornella

Overview

Col d'Ornella is a long, forgiving category 3 climb that rewards patience over power. Over its full 18.8 km it gains just 611 m net, from a start elevation of 763 m to a summit at 1374 m, which works out to a modest 3.25% average gradient. On paper that sounds almost benign — closer to a false flat than a mountain — and for long stretches it is. But the total ascent of 647 m tells you the road is not perfectly monotonic: there are dips and recoveries hidden inside the climb, and a single vicious pitch of 25.24% waiting to catch anyone who switches off.

How the Gradient Unfolds

The defining feature of Ornella is the gap between its average and its maximum. A 3.25% mean spread across nearly 19 km means the majority of the road sits well under gradient — rolling, drafting-friendly terrain where a group can move fast. Yet somewhere in that distance the road spikes to 25.24%, a wall roughly eight times steeper than the average. Because total ascent (647 m) exceeds net gain (611 m), you know the profile gives back a little elevation along the way, so expect short descents or flattening sections that break rhythm before the road tilts up again. The climb is less a steady grind than a long, undulating drag punctuated by one genuinely brutal ramp.

Pacing Notes

On a climb this shallow, the smart move is to hold a controlled, sustainable effort and resist the temptation to hammer the flat sections. Your FTP is the number to anchor to: sitting just below threshold for the bulk of the 18.8 km leaves a reserve for the 25.24% ramp, where power demands briefly spike far above anything the average suggests. If you don't know your threshold yet, run the numbers through the FTP estimator before you plan your day. Keep cadence high on the rolling terrain to save your legs, then shift early and grind through the steep pitch rather than surging into it.

Gearing

For most riders the low average gradient means you'll spend a lot of time in the middle of the cassette — but that 25.24% ramp completely rewrites the gearing conversation. A compact 34-tooth chainring paired with a 34×32 will handle the vast majority of the climb comfortably. For the steepest pitch, though, a 34×34 is the safer choice; the extra sprocket buys you a lower, spinnable gear so you can keep the pedals turning instead of stalling out. If your bike will take it, err toward the 34×34 — you'll barely notice it on the shallow kilometres and you'll be grateful for it on the wall.

Summary

Col d'Ornella is a deceptive climb: long and gentle on average, with one savage sting in its tail. Pace it steadily, gear conservatively, and respect the ramp.

Length: 18.8 km
Average gradient: 3.25%
Max gradient: 25.24%
Start: 763 m
Summit: 1374 m
Net gain: 611 m
Total ascent: 647 m
Category: 3