Alto del Garabato

Overview

Alto del Garabato is an HC climb — hors catégorie, the hardest rung on the ladder before you drop into the numbered categories 1 through 4. Over 11.6 km it lifts you from 1487 m at the base to a 2469 m summit, a net gain of 982 m. The average gradient reads 8.48%, and that number does most of the talking: there is very little on this mountain that resembles rest. With ramps as steep as 16.7%, Garabato belongs to the category of climbs that reward patience and punish enthusiasm.

How the Gradient Unfolds

The defining feature here is consistency. An 8.48% average across 11.6 km means the road rarely dips below a grade that keeps your heart rate pinned. There are no long flat interludes to spin the legs loose; the elevation profile is a near-continuous stair-step upward, gaining 982 m net over its length with a total ascent of 956 m. That total ascent sitting just below the net gain tells you the climb barely gives anything back — no meaningful descents interrupt the effort. The 16.7% maximum marks the cruelest pitches, roughly double the average, and those are the moments where a poorly chosen gear will have you grinding at a cadence you cannot sustain. Treat the average as your floor, not your ceiling.

Pacing Notes

The single most important discipline on Garabato is holding back early. At 8.48% for the better part of 11.6 km, this is a sustained threshold effort, so anchor your pacing to your FTP rather than to how strong you feel in the first kilometre. A good target is riding just under threshold on the average grades and allowing yourself to drift briefly over it on the 16.7% ramps, then settling straight back down. If you do not know your threshold number, run yours through the FTP estimator before you commit to a pace, because starting too hard on a climb this relentless leaves nothing for the upper slopes where the thin air near 2469 m compounds the fatigue.

Gearing

Gear for the steep pitches, not the average. With a 16.7% maximum and an 8.48% mean sustained over 11.6 km, you want a wide-range cassette that lets you keep turning the pedals without stalling. A compact 34-tooth chainring paired with a 34×32 setup is the sensible minimum for most riders here, giving you a low enough ratio to survive the ramps at a workable cadence. If you weigh more, are carrying gear, or simply want insurance against the 982 m of accumulated fatigue, step down to 34×34 for a touch more breathing room on the steepest sections. There is no shame in the easiest gear on an HC climb — it is exactly what it exists for.

Summary

Alto del Garabato is a genuine HC effort: long, steep and unremitting, with a summit at high altitude and gradients that never truly relent. Pace it to your threshold, gear it for the 16.7% pitches, and let the 8.48% average dictate your restraint from the first pedal stroke.

Length: 11.6 km
Average gradient: 8.48%
Max gradient: 16.7%
Start: 1487 m
Summit: 2469 m
Net gain: 982 m
Total ascent: 956 m
Category: HC