Collado de la Lagunilla del Corral

Overview

Collado de la Lagunilla del Corral is an HC climb in Spain (ES). It runs 11.5km from a start elevation of 1,138m to a summit at 2,116m, for a net elevation gain of 978m. The category alone tells you the scale of the effort, but the numbers back it up: an average gradient of 8.54% held over that distance puts it firmly among the hardest climbs a rider will tackle in a day.

The gap between net gain and total ascent is where this climb hides its real cost. You gain 978m of altitude, but you climb 1,721m in total — that is 743m of ascent that does not count toward your net height. In practical terms, the road repeatedly kicks up and drops back, so you pay for elevation you then give away. That undulation makes the climb harder than a steady 978m over 11.5km would suggest, and it punishes riders who try to settle into one rhythm.

How the Gradient Unfolds

The 8.54% average is a summary, not a description. On a climb with 743m of extra ascent, that average is smoothed out of pitches that run well above it and sections that flatten or descend. Expect the road to break your cadence rather than let you sit in one gear.

• Flatter and false-flat recovery sections where you can eat, drink and drop your heart rate
• Repeated short climbs stacked back to back, each demanding a fresh surge
• Short descents that erase hard-won height and force you to rebuild momentum
• Steeper ramps well above the average, where you shift down and grind

Pacing Notes

On an undulating climb like this, chase even effort, not even speed. Even-speed pacing forces you to overspend on the steep ramps and coast the flatter sections — exactly the wrong energy distribution when total ascent runs 743m over net gain. Instead, hold a steady, sustainable power output through the pitches and let your speed rise and fall with the terrain.

Anchor that target to a tested number rather than feel. If you are unsure of your ceiling, run the FTP estimator first and set a climbing power you can defend for the full 11.5km, then protect it hardest on the ramps.

Gearing

Gear for the steepest ramps, not the average. On an HC climb at 8.54% mean gradient with repeated pitches above it, a compact or sub-compact chainset paired with a wide-range cassette is the right call — think 34×32 or 34×34 so you always have a bail-out gear. Running out of cogs on a steep pitch late in an 11.5km effort wrecks your rhythm and your legs. Check your chainset and cassette before the ride, not at the base.

Summary

• Length: 11.5 km
• Average gradient: 8.54%
• Net elevation gain: 978 m
• Total ascent: 1,721 m
• Category: HC

Collado de la Lagunilla del Corral is a full HC test: 11.5km of climbing to a 2,116m summit, where the 743m gap between net gain and total ascent means the undulation, not just the average, defines the day. Pace to power, gear for the ramps, and respect the repeated surges.