Alto de Muerto

Overview

Alto de Muerto is a hors catégorie (HC) climb that earns its top billing through raw, relentless steepness. Over 15.6 km the road lifts you from a start elevation of 903 m to a 2615 m summit, a net elevation gain of 1712 m. The total ascent along the way is 2003 m, meaning there is a little rolling relief hidden inside the effort — roughly 291 m of the climbing is "repaid" descending or leveling before you claw it back. But make no mistake: with an average gradient of 11.01%, this is one of the hardest sustained climbs you can point a bike at. There is no gentle on-ramp and no long false flat to recover on. It is steep from bottom to top.

How the Gradient Unfolds

An 11.01% average across 15.6 km is brutal in a way that raw numbers only hint at. On a climb this steep, the difference between average and maximum matters enormously, but even taken as a smooth ramp, 11.01% never lets your heart rate settle. Because total ascent (2003 m) exceeds net gain (1712 m) by 291 m, expect the profile to pitch up beyond the average in places, then briefly ease so the road can rise again. That shape is punishing: every soft section is followed by a wall that reloads the effort. Plan to spend the entire 15.6 km in your lowest gears, treating each kilometer as its own small summit rather than trying to read the climb as a whole.

Pacing Notes

On a wall like this, pacing is survival. Riding much above your FTP early will bury you long before the 2615 m summit, and at 11.01% there is nowhere to soft-pedal and recover. Anchor your effort to a percentage of threshold you can hold for the full duration, then hold it honestly — the climb will punish any surge. If you do not know your threshold, run the numbers through the FTP estimator first and set a wattage ceiling before you start. With 1712 m of net gain to grind out, patience in the opening kilometers is what leaves you something for the top.

Gearing

Do not under-gear this one. An 11.01% average over 15.6 km rewards a wide, easy cassette and a compact crankset. A 34×32 is the sensible minimum for most riders, and even strong climbers will be grateful for it when the gradient spikes above the average. If you have any doubt about your climbing legs, or you are carrying fatigue, go straight to a 34×34 — the extra range keeps your cadence up and your knees intact across a sustained 1712 m of climbing. On a wall this long and steep, spinning a lower gear beats grinding a bigger one every single time.

Summary

Alto de Muerto is a genuine HC test: 15.6 km that never relents, averaging 11.01% and stacking up 1712 m of net gain to a 2615 m summit. Gear low, pace to your threshold, and respect it from the first pedal stroke.

Length: 15.6 km
Average gradient: 11.01%
Max gradient: n/a
Start: 903 m
Summit: 2615 m
Net gain: 1712 m
Total ascent: 2003 m
Category: HC