Alto de la Cuchilla

Overview

Alto de la Cuchilla is an hors catégorie giant, the kind of climb that measures your season rather than your afternoon. It runs for 29.1 km at an average gradient of 5.52%, but that tidy average hides the scale of the effort: you start at 1755 m and finish at 3363 m, a net elevation gain of 1608 m. Add in the dips and reliefs along the way and the total ascent comes to 1613 m. This is a high-altitude climb by any definition, and the summit sits well above the thresholds where thin air starts to bite. With a max gradient of 9.92%, it never turns brutally steep, but the sheer length means there is nowhere to hide.

How the Gradient Unfolds

At 5.52% average across 29.1 km, Cuchilla is a rhythm climb rather than a wall. The 9.92% maximum tells you the steepest pitches stay just below double digits, so the challenge is duration and altitude, not lurching ramps. Expect long stretches sitting near or just above the average, punctuated by the occasional harder kick toward that near-10% ceiling. The 5 m gap between net gain (1608 m) and total ascent (1613 m) confirms the profile is almost entirely uphill, with only trivial descending relief. In practice that means your legs get no real recovery from gravity, only from easing your own effort. The higher you climb toward 3363 m, the more the reduced oxygen amplifies every percent of gradient.

Pacing Notes

On a climb this long, pacing discipline decides everything. Anchor your effort to a percentage of your FTP and hold it, resisting the urge to chase the early kilometres. On an HC effort spanning 29.1 km and 1608 m of gain, a surge in the first third will cost you dearly across the back half, especially as you push past 3000 m and altitude flattens your ceiling. If you are unsure of your current number, run the numbers through the FTP estimator before you plan power targets. A steady sub-threshold effort, sipping fuel every few kilometres, is the way to reach 3363 m with something left. Save any real efforts above your target for the closing stretch, once the summit is genuinely within reach.

Gearing

Length plus altitude is the argument for generous gearing here. Even though the 9.92% max is manageable, holding 5.52% for 29.1 km while climbing to 3363 m grinds down your muscular reserves, and lower cadence at altitude is punishing. A compact 34-tooth inner paired with a wide cassette is the sensible baseline. A 34×32 will get most strong climbers up, but for the fatigue that builds late in a 1608 m ascent, a 34×34 gives you the extra spin to protect your legs and keep cadence high when the air thins. If your bike accepts it, the 34×34 is the safer choice for this climb.

Summary

Alto de la Cuchilla is a true hors catégorie test: sustained, high, and unforgiving in length rather than steepness. Pace it conservatively, gear for the long haul, and respect the altitude, and its 29.1 km will reward you at the top.

Length: 29.1 km
Average gradient: 5.52%
Max gradient: 9.92%
Start: 1755 m
Summit: 3363 m
Net gain: 1608 m
Total ascent: 1613 m
Category: HC