Alto de los Patios

Overview

Alto de los Patios is a hors catégorie climb that gives you nowhere to hide. Over 17.2 km the road averages 8.61%, and it does not lean on a single brutal wall to earn that number — it stays relentlessly steep for the entire distance. You start at 1879 m and finish at 3361 m, a net gain of 1482 m with 1481 m of total ascent, meaning the profile climbs almost without pause. At these altitudes the thin air compounds every pedal stroke, so the effort feels harder than the gradient alone suggests. This is a full HC test of pacing, gearing, and patience.

How the Gradient Unfolds

The defining feature here is consistency of difficulty. An 8.61% average sustained across 17.2 km is exhausting because there is no valley of recovery to reset your legs. Layered on top is a maximum pitch of 26.17% — more than three times the average — so somewhere on the climb the road kicks into a ramp steep enough to force you out of the saddle or into your easiest gear just to keep momentum. Expect the grade to oscillate around that 8.61% mean: stretches near the average that already burn, punctuated by sharper pitches climbing toward the 26.17% extreme. Because the total ascent (1481 m) almost exactly matches the net gain (1482 m), there is virtually no downhill respite — every metre you climb, you keep.

Pacing Notes

On a climb this long and steep, pacing is everything. Ride the opening kilometres well below your ceiling; the 3361 m summit altitude will quietly rob you of power, so an effort that feels sustainable low down becomes unsustainable near the top. Anchor your pace to your FTP and hold the steady sections at a controlled tempo, saving matches for the pitches that spike toward 26.17%. If you do not know your threshold, run the numbers through the FTP estimator before you plan your effort. The goal across 17.2 km is a negative-split mindset: if anything, arrive at the steepest ramps with something in reserve rather than blowing apart in the first third.

Gearing

Do not underestimate what an 8.61% average over 17.2 km demands of your drivetrain — and remember the road touches 26.17% at its worst. A compact 34-tooth chainring is the sensible front end. Pair it with at least a 34×32 for the sustained grade, and if you have the option, fit a 34×34 to give yourself a genuine bailout gear for the steepest ramps and the oxygen-starved upper slopes near 3361 m. Spinning a low gear preserves your legs far better than grinding; on an HC climb at altitude, cadence is survival.

Summary

Alto de los Patios is a true hors catégorie ascent: long, unrelenting, and made harder by the altitude it reaches. Respect the distance, gear low, pace conservatively, and the summit at 3361 m is within reach.

Length: 17.2 km
Average gradient: 8.61%
Max gradient: 26.17%
Start: 1879 m
Summit: 3361 m
Net gain: 1482 m
Total ascent: 1481 m
Category: HC