Alto de La Peña

Overview

Alto de La Peña is a long, sustained category 1 climb that stretches for 25.6 km and lifts you from a valley floor at 595 m all the way to a summit of 2011 m. That is a net elevation gain of 1416 m over the course of the ascent, with a total ascent of 1431 m once the small dips and re-climbs along the way are counted. The average gradient sits at 5.53%, which sounds moderate on paper but hides a serious amount of vertical work simply because the climb refuses to end. With a maximum gradient of 11.06%, this is a road that rewards patience far more than aggression.

How the Gradient Unfolds

The defining feature here is length rather than a single wall of pain. Averaging 5.53% across 25.6 km means the road rarely lets you coast, yet it also rarely pins you against the maximum of 11.06%. Because the net gain of 1416 m is slightly below the total ascent of 1431 m, there are short reprieves where the gradient eases or briefly tips downhill before climbing again. Those 15 m of extra ascent are a reminder that momentum built on the flatter ramps can be lost quickly. Expect the steepest pitches, approaching that 11.06% figure, to arrive as isolated kicks rather than long ramps, sitting well above the 5.53% baseline you will spend most of your time riding.

Pacing Notes

On a climb this long, discipline is everything. The gap between the 5.53% average and the 11.06% maximum tells you the story: hold a steady effort just under your threshold, then absorb the steeper ramps without surging. Anchoring your effort to your FTP is the smartest way to ride 25.6 km without blowing up before the summit at 2011 m. Aim to sit comfortably below threshold on the shallower sections and let the gradient, not your ego, dictate where you spend matches. If you are unsure of your number, run the FTP estimator before you start planning splits. Remember that you are gaining 1416 m of altitude, so thinning air near the top will quietly tax legs that felt fine lower down.

Gearing

For 25.6 km at 5.53% with spikes to 11.06%, gear for the long haul rather than the average. A compact 34-tooth inner chainring paired with a wide cassette is the sensible baseline. A 34×32 will get most fit riders over the steeper ramps, but on a climb that keeps going for 1416 m of gain, a 34×34 buys you a lower, more sustainable cadence for the moments the road tilts toward 11.06%. If your legs are already loaded from earlier climbing, favor the 34×34 and spin.

Summary

Alto de La Peña is a test of endurance and pacing far more than raw power. Ride it steady, gear low, and respect the distance to the 2011 m summit.

Length: 25.6 km
Average gradient: 5.53%
Max gradient: 11.06%
Start: 595 m
Summit: 2011 m
Net gain: 1416 m
Total ascent: 1431 m
Category: 1