Alto del Bosque

Alto del Bosque cycling climb profile

Alto del Bosque is an HC climb where the average gradient tells most of the story. Over 15.5km, it averages 10.1%, starting at 939m and reaching 2500m. That combination means this is not a climb where the difficulty comes from one short wall attached to otherwise moderate terrain. The arithmetic is harsher than that: to average above 10% for this length, the road has to keep pressing almost all the way to the summit.

The listed maximum gradient of 30.08% changes how the climb should be ridden. Even if that pitch is brief, it is steep enough to force a shift from normal climbing rhythm into survival management. On a climb with this average, those extreme sections are especially expensive because there is limited gradient relief available across the full profile. If you go too deep before the steepest ramps, the climb gives you very little room to repair the damage.

How the gradient unfolds

The available profile data does not break Alto del Bosque into kilometer-by-kilometer segments, so the safest reading is to treat it as a sustained, high-gradient ascent from bottom to summit rather than trying to identify a single decisive sector. The climb rises by 1561m net from start to finish, with 1525m of total ascent listed, which reinforces the main riding experience: this is overwhelmingly uphill terrain.

That matters tactically. On a climb averaging 10.1%, small changes in pace have a large cost. Riding slightly above sustainable power early will not feel slightly harder for long - it will compound quickly because the gradient keeps torque demand high. The road is long enough that the first part should feel controlled, not heroic.

Pacing and gearing

Use the opening kilometers to settle below your ceiling, especially if pacing by /glossary/ftp. The temptation on a steep climb is to chase cadence or speed, but Alto del Bosque rewards restraint. The goal is to arrive at the hardest pitches with enough margin to keep the bike moving smoothly rather than spiking power repeatedly.

Gearing should be chosen for the maximum gradient, not the average. A 10.1% average already demands a low climbing gear; a 30.08% maximum makes that non-negotiable. If your easiest gear only works when you are fresh, it is not low enough for this climb. Prioritize a setup that lets you keep pressure on the pedals without grinding every steep ramp at a near-stall cadence.

The practical approach is simple: ride the first half as if the climb gets harder later, because with this profile, it probably will feel that way even if the gradient stays consistent. Keep surges short, avoid standing unless it is useful for traction or torque, and save your best effort for the upper slopes toward 2500m. Alto del Bosque is not a climb to overpower. It is a climb to ration.