Paso de Vacas Muertas

Paso de Vacas Muertas cycling climb profile

Paso de Vacas Muertas is an HC climb in Chile that sits firmly in the category of climbs where restraint matters more than aggression. The headline numbers are severe: 19.4 km at an average gradient of 10.31%, starting at 1382 m and topping out at 3384 m. That gives the climb 2002 m of net elevation gain, which is a huge vertical load for a single ascent.

The key point is not just that it is steep. It is that it stays steep for long enough to punish any rider who treats the opening kilometres like a normal mountain effort. A climb averaging above 10% across 19.4 km is not built around one isolated ramp. It demands sustained torque, careful cadence management, and a pacing plan that assumes there will be very little genuinely easy recovery.

How the gradient unfolds

Without a kilometre-by-kilometre profile, the safest way to read Paso de Vacas Muertas is through the relationship between its average and maximum gradients. The 10.31% average tells you the climb is consistently hard. The 20.55% maximum gradient tells you there are sections steep enough to break rhythm completely if you arrive overgeared or already riding above sustainable effort.

That combination changes the way the climb should be ridden. On a climb with a lower average gradient, a short wall can be absorbed with momentum or a brief surge. Here, the baseline is already demanding, so the steepest ramps come on top of an effort that is likely already close to the limit. The practical consequence is simple: every early acceleration carries interest later.

The elevation range also matters. The climb rises from 1382 m to 3384 m, so the upper part should be treated with respect even if the legs feel good lower down. The cost of repeated surges tends to show up late on long climbs, and Paso de Vacas Muertas has enough vertical gain for those mistakes to compound.

Pacing and gearing notes

The correct pacing strategy is conservative at the bottom and disciplined through the middle. Start below the effort you think you can hold, then let the climb come back to you. If you are using power, this is a climb where riding just under your sustainable climbing effort is more useful than chasing a target that only works on paper. For context on setting that effort, see /glossary/ftp.

Gearing should be chosen for the maximum gradient, not the average. A 10.31% average already argues for a compact climbing setup, but the 20.55% maximum is the number that should drive the decision. If your lowest gear only feels comfortable on steady gradients, it may not be enough here. The goal is not to spin easily everywhere. It is to avoid being forced into low-cadence survival mode when the steepest ramps arrive.

For pacing, think in three rules:

• Keep the first part controlled, even if the speed feels too low.
• Protect cadence before protecting speed.
• Save enough margin for ramps above the average gradient.

Paso de Vacas Muertas is the kind of climb where the rider who looks slightly too patient early is usually the one making the right calculation. The numbers do not reward bravery at the bottom. They reward a measured effort that can still respond when the road pitches into its steepest sections.