Boquerón

Overview

Boquerón is a hors catégorie (HC) climb, the hardest classification there is — above categories 1 through 4 — and its numbers explain why. Over just 8 km the road lifts you from a start elevation of 222 m to a summit at 1049 m. That works out to a net elevation gain of 827 m, with a total ascent of 764 m once you account for the road's minor dips and rolls. The headline figure is the average gradient: 10.3% sustained across the entire 8 km. This is not a climb with a false flat to recover on. It is a wall dressed up as a road, and the 25.33% maximum gradient confirms that somewhere along the way it briefly becomes almost unrideable.

How the Gradient Unfolds

Averages hide the story, so read the shape carefully. A 10.3% mean over 8 km means that for every kilometre you gain roughly 103 vertical metres — relentless by any standard. But an average of 10.3% paired with a 25.33% maximum tells you the climb is not uniform. There are pitches well above the mean, meaning stretches that spike toward that 25.33% wall are balanced by sections that dip back toward, or just below, double digits. The gap between the 827 m net gain and the 764 m total ascent is small, which tells you the road climbs almost monotonically — there is very little descending to give back hard-won altitude. Expect the steepest ramps to arrive without much warning and to demand everything you have left.

Pacing Notes

On a climb this steep, pacing is survival. The single biggest mistake is going out hard on the lower slopes and detonating before the summit at 1049 m. Anchor your effort to your FTP and hold a power target you can sustain for the full 8 km, not the first two. On the 25.33% ramps your speed will crater and your power will spike; let it, briefly, then settle back down. If you do not know your threshold number, get a baseline first with the FTP estimator so you climb to data rather than feel. Ride the steepest pitches a fraction below your ceiling and save a little for the top — you will need it.

Gearing

Do not under-gear this one. With a 10.3% average and pitches near 25.33%, most riders should treat compact-plus-wide as the minimum. A 34×32 is the entry point and will get many fit riders up, but on the steepest ramps it leaves you grinding at a low, knee-loading cadence. A 34×34 gives you meaningfully more room to spin and is the smarter choice for anyone not racing — the extra range turns those 25.33% moments from a lurching survival crawl into something you can actually pedal. If your bike accepts it, gear lower rather than higher. You will never regret a bailout gear on an HC climb.

Summary

Boquerón is short at 8 km but earns its HC badge through sheer, unbroken steepness — a 10.3% average, ramps to 25.33%, and 827 m of net vertical gain packed into a single sustained effort. Gear low, pace to your threshold, and respect it from the bottom.

Length: 8 km
Average gradient: 10.3%
Max gradient: 25.33%
Start: 222 m
Summit: 1049 m
Net gain: 827 m
Total ascent: 764 m
Category: HC