Alto del Padre

Overview

Alto del Padre is a hors catégorie monster, the kind of ascent that redefines what your legs think "long" means. The road runs for 31.8 km, climbing from a start elevation of 1998 m to a summit at 3919 m. That is a net elevation gain of 1921 m in one continuous effort, with a total ascent of 2088 m once the small dips and false flats are counted in.

The average gradient of 6.05% sounds almost civilised on paper. It is not. Over nearly 32 km, that number compounds relentlessly, and the max gradient of 16.82% guarantees that the average hides some genuinely brutal ramps. Add the thin air of a 3919 m summit and this is a climb that punishes anyone who treats it casually.

How the Gradient Unfolds

The defining feature here is duration. A 6.05% average across 31.8 km means there is nowhere to truly recover — you are climbing from the first pedal stroke to the last. The gap between the net gain of 1921 m and the total ascent of 2088 m tells you there are 167 m of descending or flat mixed in, small respites scattered across the profile rather than one long plateau.

Those brief lulls matter, because the max gradient of 16.82% is more than double the average. Expect the road to pitch up sharply in places, forcing you out of rhythm. The higher you climb toward 3919 m, the more each ramp costs, as altitude steadily thins your available power.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your FTP and resist the temptation to chase the early kilometres. A sustainable target for a 31.8 km HC effort sits comfortably below threshold — you are pacing for over an hour of continuous work, not a 20-minute test.

If you are not sure where your threshold sits, run the numbers first with the FTP estimator. Then plan to spend the steep 16.82% pitches slightly above your average power and settle back down immediately afterward, rather than blowing your matches trying to hold a fixed speed. At altitude near 3919 m, your usual power figures will drift downward, so leave headroom rather than defending a number that thin air won't let you produce.

Gearing

Gear for survival, not ego. For an HC climb of this length with ramps hitting 16.82%, a compact chainring paired with a wide-range cassette is the sensible baseline. A 34×32 will get most trained riders up in reasonable shape, but on the steepest sections, late in a 2088 m day of ascent, you will be grateful for anything easier.

If your legs or your load favour caution, a 34×34 gives you that extra spinning gear for the 16.82% pitches and the final thin-air kilometres. There is no prize for grinding — protect your knees and keep your cadence up.

Summary

Alto del Padre is a full-day objective: 31.8 km, a 6.05% average, and a summit at 3919 m that leaves you 1921 m above where you started. Pace it patiently, gear it generously, and respect the altitude.

Length: 31.8 km
Average gradient: 6.05%
Max gradient: 16.82%
Start: 1998 m
Summit: 3919 m
Net gain: 1921 m
Total ascent: 2088 m
Category: HC