Alto de la Cruz de Monguí

Overview

Alto de la Cruz de Monguí is one of those climbs that reads like a mistake on paper and then holds its promise on the road. Over 13.2 km it averages 12.85%, a figure that sits far outside what most riders ever train for, and it carries you from a start elevation of 1849 m up to a summit at 3550 m. That is 1701 m of net gain, with 1674 m of total ascent — meaning there is almost no relief on the way up, no false descents to reset your legs. It is rated HC, hors catégorie, the hardest classification there is, and the numbers make clear why. This is a climb where the gradient, the length, and the thin summit air conspire together.

How the Gradient Unfolds

The defining trait here is consistency at a punishing level. An average of 12.85% is not built from a few brutal walls stitched between easy stretches; when the mean sits that high, the whole climb lives in the red. The steepest pitch reaches 22.13%, nearly double the average, so expect ramps that force you out of the saddle or down to a grinding crawl. Because total ascent (1674 m) tracks so closely with net gain (1701 m), the road climbs almost every meter of its length. There is no coasting, no recovery flat. You settle into a rhythm and defend it for the full 13.2 km, watching the elevation tick steadily from 1849 m toward 3550 m.

Pacing Notes

Pacing a climb this steep is an exercise in restraint. Your instinct on the lower slopes will be to match the gradient with force — resist it. Anchor your effort to a percentage of your FTP and hold that ceiling, because at 12.85% average there is nowhere to recover a mistake. If you do not know your threshold, run the numbers through the FTP estimator before you start planning splits. Remember too that you finish at 3550 m, where reduced oxygen quietly shaves watts off whatever you thought you had. Budget for that by riding the first two-thirds conservatively and keeping something in reserve for the 22.13% ramps.

Gearing

Do not under-gear this climb. On a 12.85% average with pitches to 22.13%, most riders will want the easiest ratio they can bolt on. A 34×32 is the minimum I would recommend, and even strong climbers will spend long stretches wishing for more. A 34×34 is the smarter default here, giving you the cadence headroom to keep spinning when the road tips toward its 22.13% maximum rather than lurching into a knee-straining mash. If your setup allows anything easier than 34×34, use it — over 13.2 km of this, every extra tooth is a mercy.

Summary

Alto de la Cruz de Monguí is a pure test: steep, sustained, and high, with a summit at 3550 m that punishes anyone who spent too much early. Gear low, pace with discipline, and respect the altitude.

Length: 13.2 km
Average gradient: 12.85%
Max gradient: 22.13%
Start: 1849 m
Summit: 3550 m
Net gain: 1701 m
Total ascent: 1674 m
Category: HC