Puerto de la Luz

Overview

Puerto de la Luz is an HC monster — hors catégorie, the hardest rating there is, sitting above categories 1 through 4. Over just 9.4 km it averages a savage 11.44%, and that number is not softened by any meaningful flat: this is a climb that points relentlessly upward from the 941 m start to a 2017 m summit. The net elevation gain is 1076 m, with 1041 m of total ascent packed into a distance most riders would consider a warm-up on gentler terrain. When a climb this short earns HC status, the gradient is doing all the talking.

How the Gradient Unfolds

The defining feature here is sustained steepness rather than a single wall. An 11.44% average across 9.4 km means there is almost nowhere to recover — the road simply keeps tilting. The gradient peaks at 17.82%, and on a climb with this average you should expect that maximum to arrive not as an isolated spike but as one of several ramps in the same brutal register. Because the net gain (1076 m) sits close to the total ascent (1041 m), there is virtually no downhill respite folded into the profile: nearly every metre climbed stays climbed. Treat the whole ascent as one long effort punctuated by pitches that push toward 17.82%.

Pacing Notes

On a climb averaging 11.44%, restraint early is everything. Your FTP is the number that matters most here — go over it in the first kilometre and the 17.82% ramps later will break you. Ride the shallower sections at or just below threshold and accept that the steepest pitches will drag you above it regardless. If you are not sure where your ceiling sits, run your recent efforts through the FTP estimator before you commit to a target. With 9.4 km and 1076 m of gain ahead, the goal is a power line you can hold to the 2017 m summit, not a heroic opening that leaves you crawling the final third.

Gearing

Do not under-gear this one. With an 11.44% average and pitches to 17.82%, a compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 is the minimum I would recommend, and even strong climbers will be grateful for the extra range of a 34×34 when the road stands up. If your setup allows anything easier, use it — spinning a low gear at 941 m onward preserves the muscular reserves you will need across 9.4 km of near-continuous double-digit grade. Bigger riders in particular should default to 34×34 rather than gambling on 34×32.

Summary

Puerto de la Luz is a genuinely hard HC climb: short in distance but relentless in gradient, rising 1076 m to a lung-searing 2017 m finish. Pace it with discipline, gear low, and respect the 17.82% ramps.

Length: 9.4 km
Average gradient: 11.44%
Max gradient: 17.82%
Start: 941 m
Summit: 2017 m
Net gain: 1076 m
Total ascent: 1041 m
Category: HC