Col de la Vierge

Overview

The Col de la Vierge is a long, deceptively gentle-looking category 2 ascent that stretches for 14.3 km. On paper its 4.08% average gradient reads like a warm-up, and the raw numbers are modest: you start at 375 m and finish at 958 m, a net elevation gain of 583 m. But averages hide the truth on this climb. The total ascent tallies 653 m — meaningfully more than the net gain — which tells you the road does not simply tilt upward and hold. It rolls, dips, and kicks, and somewhere in that 14.3 km the gradient spikes to a brutal 21.87%. That single figure is what turns a comfortable tempo effort into a climb that demands respect.

How the Gradient Unfolds

Do the arithmetic and the story becomes clear. A 4.08% average across 14.3 km, yet a total ascent of 653 m against a net gain of only 583 m, means roughly 70 m of climbing is effectively "wasted" on false flats and short descents that you then have to reclaim. That is the signature of an uneven, stepped profile rather than a steady wall. The 21.87% maximum is more than five times the average, so the climb is clearly front-loaded or punctuated by a distinct ramp — a section where the road pitches up far beyond anything the overall number suggests. Expect long stretches near or below 4.08% that lull you into cruising, broken by sharp accelerations in gradient that force you out of rhythm. The gap between summit at 958 m and start at 375 m is real work; the shape is what makes it selective.

Pacing Notes

Because the average is soft but the peaks are savage, pacing here is about not overspending on the easy kilometres. Ride the flatter sections just under threshold and save headroom for the ramp toward 21.87%, where you will inevitably surge above your sustainable power. Anchor your effort to your FTP: on the 4.08% stretches you should sit comfortably below it, treating the climb as a tempo effort with sharp accelerations layered on top. If you do not know your number, run the numbers first with the FTP estimator so you can set realistic targets rather than guessing. Blow up on the steep pitch and the remaining kilometres to 958 m will feel far longer than they are.

Gearing

The 4.08% average tempts riders into bringing too tall a cassette, and then the 21.87% wall punishes them for it. Gear for the steepest metre, not the average. A compact 34-tooth chainring paired with a 34×32 is the sensible floor for most amateurs tackling a pitch this severe, and if you climb at lower cadence or carry fatigue into the 14.3 km, step up to a 34×34. That extra sprocket buys you the spin to survive the ramp without cross-chaining under load. Over 583 m of net gain your legs will thank you for the easier gear long before the summit.

Summary

The Col de la Vierge rewards patience and punishes complacency: a gentle average hiding a genuinely steep sting. Ride the flat kilometres smart, gear for the wall, and the 958 m summit is within reach.

Length: 14.3 km
Average gradient: 4.08%
Max gradient: 21.87%
Start: 375 m
Summit: 958 m
Net gain: 583 m
Total ascent: 653 m
Category: 2