Alto de los Gavilanes

Overview

Alto de los Gavilanes is a genuine hors catégorie test: 18 km of continuous climbing at an average of 6.7%, with the road tilting as steep as 16.06% before it lets you go. You begin at 2152 m and finish at 3358 m, a summit that already sits in thin, oxygen-poor air. The net elevation gain is 1206 m, with 1190 m of that as pure ascent — meaning the climb is almost relentlessly upward, with barely a metre given back along the way.

This is not a climb that eases you in and then explodes. It is long, high, and honest, punishing anyone who mistakes its steady average for a comfortable rhythm.

How the Gradient Unfolds

The headline number, 6.7%, is deceptive on a climb of this length. Over 18 km, a 6.7% average is sustained work with no meaningful recovery, and the near-identical figures for net gain (1206 m) and total ascent (1190 m) confirm there are no descents or false flats to coast through. Every kilometre trends up.

The 16.06% maximum tells you the road is not uniform. Ramps well above the average punctuate the climb, and at more than double the mean gradient they arrive as sharp spikes rather than gentle undulations. Expect the pattern of any long HC ascent: stretches at or near the average that let you settle, broken by steeper pitches that force you out of the saddle. The final third, delivered above 3000 m, is where altitude compounds the gradient and the climb earns its category.

Pacing Notes

The mistake here is going out hard on the lower slopes and cracking before the altitude bites. On a climb this long, discipline wins. Aim to hold a steady effort just below your threshold on the sustained sections and reserve capacity for the 16.06% ramps, where a brief surge is unavoidable.

Your FTP is the number to plan around — but remember that above 3000 m your sustainable power drops noticeably, so the wattage you can hold near the 3358 m summit will be lower than at the 2152 m base. If you do not know your threshold, run the numbers through the FTP estimator first, then pace the climb by feel and heart rate as the air thins toward the top.

Gearing

Do not under-gear this one. With 18 km at 6.7% and pitches to 16.06% — all at altitude — you want a wide cassette and a compact crank. A compact 34-tooth inner ring paired with at least a 32-tooth sprocket (34×32) is the sensible minimum for most riders, giving you a bailout gear for the steep ramps without spinning out on the steadier grades.

If you climb at moderate wattage, or simply want to protect your legs for the thin-air finish, size up to 34×34. The extra sprocket costs little and buys real insurance when the road hits 16% at over 3000 m of elevation. On a climb like Gavilanes, easier gearing is not weakness — it is what keeps your cadence and your composure intact to the summit.

Summary

Alto de los Gavilanes is a long, high, honest HC climb: 18 km of near-constant ascent averaging 6.7%, spiking to 16.06%, from 2152 m up to a 3358 m summit. Gear low, pace with discipline, and respect the altitude — it is the deciding factor on the final slopes.

Length: 18 km
Average gradient: 6.7%
Max gradient: 16.06%
Start: 2152 m
Summit: 3358 m
Net gain: 1206 m
Total ascent: 1190 m
Category: HC