Paso de las Leñas

Paso de las Leñas cycling climb profile

Paso de las Leñas is an HC climb because the work is long, sustained, and difficult to fake. The road rises for 22.6 km from 1,465 m to 2,918 m, gaining 1,453 m at an average gradient of 6.44%. That average is the key number for understanding the climb. It is not a short wall where you can survive on aggression. It is a long aerobic effort where small pacing mistakes compound.

The maximum gradient of 14.59% changes the character of the climb. A 6.44% average over this distance already demands steady power, but the presence of ramps above double digits means the effort will not feel perfectly even. You need enough gearing range to absorb the steepest pitches without being forced into repeated surges above threshold.

How the gradient unfolds

With only the headline profile available, the safest way to read Paso de las Leñas is as a long, high-load ascent with intermittent sting. The total distance and net gain tell you the climb is consistently uphill, while the 14.59% maximum tells you there are sections where cadence and torque management become decisive.

That combination matters tactically. On a climb averaging 6.44%, riding slightly too hard early can feel manageable because the gradient is not constantly extreme. But once the steeper ramps arrive, that early overreach becomes expensive. The rider who has been sitting just under sustainable climbing power will still have room to keep the pedals turning. The rider who has been chasing speed will start paying for every gradient change.

Pacing and gearing notes

Treat the opening as a controlled settling phase, not a place to prove form. If you know your /glossary/ftp, the logic is simple: stay below the point where breathing and cadence begin to tighten, because the climb is long enough that any early excess has plenty of time to surface.

For gearing, do not plan around the 6.44% average alone. Plan around the 14.59% maximum. The average tells you the duration of the load, but the maximum gradient tells you what can break rhythm. A compact climbing setup or otherwise generous low gear is the smart choice if you want to keep cadence stable rather than grind through the steepest ramps.

The best ride here is patient and unemotional: smooth pressure on the steadier ground, no unnecessary accelerations, and enough restraint to keep the final part of the climb from becoming survival riding. Paso de las Leñas rewards riders who pace the whole 22.6 km, not riders who win the first few kilometers.