Puerto de Lagarejo

Overview

Puerto de Lagarejo is an HC-category climb in Spain, running 12.6 km from a start elevation of 510 m to a summit at 1654 m. Its net elevation gain is 1144 m across those 12.6 km, and the average gradient reads 9.11%. On paper alone, that combination of length and sustained steepness places it firmly among the hardest paved ascents a rider will meet.

The number to watch, though, is the gap between net gain and total work. The net elevation gain is 1144 m, but the total ascent is 1481 m — a difference of 337 m. That extra 337 m of climbing comes from dips and false flats where the road gives back altitude, then demands you re-earn it. In practice, this means the climb is not a single steady wall: you pay for the descents twice, and the effort is spikier than a flat 9.11% average would suggest.

How the Gradient Unfolds

The 9.11% average is a blend, not a constant. With a maximum gradient of 34.19%, there is at least one ramp far steeper than the mean, and the 337 m of extra ascent tells you the profile rolls rather than rises cleanly. Expect the road to ease in places, then bite hard.

• Recovery sections where the gradient drops well below average and even tips downhill
• Repeated short climbs that follow each dip, re-climbing the altitude you just lost
• A steepest ramp reaching 34.19% — a wall that dictates your entire gearing choice

Pacing Notes

On a steady climb you can hold even effort and let speed float. On Lagarejo, the undulation breaks that. Chasing even speed over the 34.19% ramp would spike you far past your sustainable power output and leave you cooked for the climbs that follow each dip. Instead, pace to effort: hold a controlled ceiling on the steep pitches and let your speed collapse where it must, then use the recovery sections to genuinely recover rather than push. Knowing your threshold before you start is the difference between finishing and blowing up — run the numbers with the FTP estimator and set a wattage cap you refuse to exceed on the ramps.

Gearing

The 34.19% maximum gradient governs everything. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 at minimum, and go easier still if your legs or bike allow. A ramp that steep will stall a rider spinning out of gears, and there is no shame in a bail-out sprocket. Check your chainset and cassette before the ride: confirm the rear derailleur handles the largest cog and that the chain is long enough. Do not discover your gearing is too tall halfway up the wall.

Summary

• Length: 12.6 km
• Average gradient: 9.11%
• Maximum gradient: 34.19%
• Net elevation gain: 1144 m
• Total ascent: 1481 m
• Category: HC

Puerto de Lagarejo is a genuine HC test: long, steep, and deceptively lumpy. Respect the 337 m of hidden re-climbing, pace to effort, gear low, and the summit at 1654 m is well within reach.