Alto de Piedras Blancas

Alto de Piedras Blancas cycling climb profile

Alto de Piedras Blancas is an HC climb defined by sustained severity rather than a single headline ramp. The numbers are blunt: 25.2 km at an average gradient of 11.77%, starting at 1438 m and topping out at 4406 m. That creates 2968 m of net elevation gain, with 3151 m of total ascent across the full climb.

The practical meaning is simple: this is not a climb where the average is inflated by one brutal wall and then softened by long recoveries. A climb that holds nearly 12% across 25.2 km asks for a different approach than a shorter, punchier ascent. The speed will be low, torque demand will be high, and any early overreach has a long time to compound.

How the gradient unfolds

With only the core profile stats available, the safest reading is to treat the climb as consistently hard from bottom to summit. The max gradient of 24.66% matters because it sits on top of an already severe average. On a climb averaging 11.77%, a ramp near 25% is not just a short inconvenience - it is the kind of pitch that can force a rider out of their planned cadence and into muscular survival mode.

The difference between net elevation gain and total ascent is 183 m, which tells you there is more accumulated climbing than the start-to-summit gain alone. But the overall shape is still overwhelmingly upward: 2968 m of net gain over 25.2 km leaves very little room for the climb to feel forgiving.

The altitude range also changes the ride. Starting at 1438 m and finishing at 4406 m means the upper part of the climb is happening in a very different physiological environment than the lower slopes. Even if the gradient stayed identical, the effort would not feel identical. The same power target will become harder to sustain as the climb rises, so pacing has to anticipate that drift rather than react to it too late.

Pacing and gearing notes

The right strategy is conservative by design. If you ride the lower section at the top of your sustainable range, the climb gives you 25.2 km to pay for that choice. For most riders, this should start below threshold, with attention on keeping breathing and cadence controlled rather than chasing speed. Use /glossary/ftp as a ceiling, not a target, especially before the steepest ramps arrive.

Gearing should be chosen for the average gradient, not just the maximum. A 24.66% ramp is the obvious warning sign, but 11.77% for this long is the real limiter. Bring a low enough gear to keep pressure off the legs when cadence drops. If your easiest gear only feels comfortable on moderate climbs, it is likely too large here.

The key is to protect repeatable torque. Stay seated where possible, shift before the steepest changes rather than during them, and accept that the climb will reward steadiness more than aggression. Alto de Piedras Blancas is long enough, steep enough, and high enough that the best ride is usually the one that feels almost too controlled early and still leaves something usable near the summit.