Alto de Boquerón

Overview

Alto de Boquerón is a genuine hors catégorie test, the kind of climb that rewards patience and punishes ambition. Over 17.5 km it averages 7.26%, dragging you from a start elevation of 1864 m up to a summit at 3134 m. That is 1270 m of net vertical gain, with 1243 m of total ascent packed into a road that rarely lets you settle. An HC rating is the sport's way of saying this sits above the numbered categories entirely — beyond category 1, and in a class of its own.

The headline figures alone tell you what you are in for: a sustained 7.26% is not a gradient you can bluff, and a max pitch of 16.79% means there is at least one section that will have you out of the saddle and grinding.

How the Gradient Unfolds

With 17.5 km at an average of 7.26%, the climb never really offers a true rest. The gap between the 7.26% average and the 16.79% maximum tells the real story: this is a road of ramps. Long stretches sit near the mean, punctuated by pitches that spike well into double digits.

Because net gain (1270 m) slightly exceeds total ascent (1243 m) once you account for the way the road drifts, the elevation profile trends relentlessly upward from the 1864 m base. There are no long descents to recover on — every metre gained is a metre you keep. The thin air near the 3134 m summit compounds the difficulty, so the final kilometres feel harder than the gradient number suggests.

Pacing Notes

The discipline here is simple to state and hard to execute: ride to your FTP, not to the road. At 7.26% average over 17.5 km, the temptation to chase the wheel in front is constant, but going into the red before the steepest ramps is how riders blow up on HC climbs.

If you do not know your threshold power, run the numbers through the FTP estimator before you commit. Aim to sit just under threshold on the sustained sections and accept that the 16.79% pitches will briefly push you above it — that is normal. Save a little for the top, because the altitude near 3134 m will quietly tax your legs regardless of how well you have paced the lower slopes.

Gearing

Gear for the ramps, not the average. A compact 34-tooth inner chainring is the sensible baseline for an HC climb of this length. Paired with a 34×32 cassette combination, most trained riders can hold a workable cadence through the 7.26% sections. But given that max gradient of 16.79% — and the altitude working against you above 3134 m of elevation gain over the ascent — a 34×34 is the smarter choice for anyone who values spinning over grinding. When in doubt on a climb this steep and this long, take the easier gear.

Summary

Alto de Boquerón is a full HC challenge: long, high, and steep enough that respect for the numbers is your best defence. Pace it to your threshold, gear it generously, and let the 17.5 km come to you.

Length: 17.5 km
Average gradient: 7.26%
Max gradient: 16.79%
Start: 1864 m
Summit: 3134 m
Net gain: 1270 m
Total ascent: 1243 m
Category: HC