Pas de Vouerca

Overview

Pas de Vouerca is an hors catégorie monster, the kind of climb that earns its HC label before you even reach the halfway mark. Over 17 km the road drags you from a valley floor at 411 m all the way to a 2031 m summit — a net gain of 1620 m and a total ascent of 1617 m once the small dips are counted. The average gradient sits at a punishing 9.54%, and unlike many long climbs that pad their length with gentle false flats, this one keeps the pressure on almost the entire way. If you are chasing a genuine HC test, this is one of the hardest you will find.

How the Gradient Unfolds

The headline number is the 9.54% average, but averages hide the story. Sustaining nearly 9.54% across 17 km means there is very little respite — for every kilometre that dips below the mean, another climbs well above it to compensate. The defining feature is the 30.79% max gradient, a wall more than three times steeper than the average. Pitches like that force you out of the saddle and turn cadence into survival. Expect the road to lurch between grinding double-digit ramps and short recovery stretches that never quite let your heart rate settle. With 1620 m of vertical to swallow, the altitude gain compounds the effort as you push toward 2031 m, where thinner air adds its own tax.

Pacing Notes

On a climb this long and this steep, pacing is everything. The 17 km distance means you are looking at a sustained effort measured in tens of minutes, not a short burst, so ride it as a time trial against yourself. Anchor your effort to your FTP: on the 9.54% stretches, aim to hold just below threshold so you have headroom for the 30.79% pitch, where power will spike no matter how disciplined you are. Blow up early and the remaining kilometres to 2031 m will be miserable. If you are unsure of your threshold number, run the numbers through the FTP estimator before you commit, then set target zones for the lower and upper halves of the climb accordingly.

Gearing

Do not under-gear this one. With an average of 9.54% and ramps hitting 30.79%, a compact chainring paired with a wide cassette is the minimum sensible setup. A 34×32 will get most fit riders up the sustained sections, but the max gradient argues strongly for going lower — a 34×34 gives you the spinning room to survive the steepest wall without cross-chaining your knees into oblivion. Over 17 km and 1620 m of gain, protecting your legs early with easier gearing pays dividends late. If your bike accepts a mountain-bike-style cassette, take it.

Summary

Pas de Vouerca is a full-value HC ascent: 17 km, 9.54% average, and a 30.79% max that will define your day. Gear low, pace it to your threshold, and respect the 1620 m of climbing between the 411 m start and the 2031 m summit.

Length: 17 km
Average gradient: 9.54%
Max gradient: 30.79%
Start: 411 m
Summit: 2031 m
Net gain: 1620 m
Total ascent: 1617 m
Category: HC