Alto de Peña Negra

Overview

Alto de Peña Negra is a long, high-altitude category-1 ascent that never quite lets you settle. Over 20.7 km it climbs from a start elevation of 1670 m to a summit at 2878 m, delivering 1208 m of net elevation gain. The average gradient sits at 5.84%, which reads as a steady tempo climb on paper, but the length and the thin air near the top change the maths considerably. Add in a total ascent of 1281 m — more than the net figure because of small dips and false flats along the way — and you get a climb that asks for patience as much as power. This is not a wall you attack; it is a distance you have to manage.

How the Gradient Unfolds

The defining tension of Peña Negra is the gap between its 5.84% average and its 14.48% maximum gradient. That spread of nearly nine points tells you the climb is uneven: long stretches near or slightly below the average, punctuated by ramps that spike sharply. Because the total ascent (1281 m) exceeds the net gain (1208 m), there are 73 m of climbing hidden inside rollers and recoveries that don't show up in the point-to-point profile. Practically, that means you'll crest a rise, lose a little of your hard-won height, then claw it back. The steepest pitches at 14.48% are where riders who paced the first two-thirds too hard come undone. Treat the average as a budget, not a promise.

Pacing Notes

Over 20.7 km, pacing discipline is everything. Anchor your effort to your FTP and aim to hold a sustainable percentage of it rather than chasing the steep ramps. If you don't know your number, run the FTP estimator before you go so your target power is grounded in data, not optimism. A sound plan is to ride the 5.84% sections just under threshold, then allow short surges over the 14.48% pitches, reeling the effort back the moment the road eases. The climb finishes at 2878 m, and the altitude will quietly shave watts off your ceiling in the final kilometres — so leave a margin. Riders who blow up on Peña Negra almost always spent it early on gradients that felt deceptively gentle.

Gearing

With 1208 m to gain across 20.7 km and ramps hitting 14.48%, generous gearing is your friend. A 34×32 is a reasonable minimum for strong climbers who can turn a bigger gear on the average slopes, but most riders will be far happier with a 34×34, which drops your cadence-preserving floor low enough to spin through the steepest pitches without grinding to a stall. At altitude near 2878 m, a lower gear also lets you keep the legs turning when your aerobic system is compromised. Err toward the easier ratio; there is no prize for suffering in a gear that's too tall this high up.

Summary

Alto de Peña Negra rewards the disciplined and punishes the impatient: a long category-1 climb where the modest average hides real bite. Pace to your FTP, gear low, and respect the thin air at the top.

Length: 20.7 km
Average gradient: 5.84%
Max gradient: 14.48%
Start: 1670 m
Summit: 2878 m
Net gain: 1208 m
Total ascent: 1281 m
Category: 1