Collado de la Cruz de Guardia

Overview

Collado de la Cruz de Guardia is a hors catégorie (HC) climb in Spain, ranked at the top of the difficulty scale for good reason. Over just 6.7 km it delivers a net elevation gain of 1,123 m, launching from a start elevation of 986 m and topping out at a 2,109 m summit. That combination of short distance and enormous vertical is what pushes it into HC territory: the average gradient sits at 16.64%, a figure that leaves almost no room to breathe.

The gap between the two ascent numbers tells the rest of the story. The net elevation gain is 1,123 m, but the total ascent is 1,265 m, meaning roughly 142 m of climbing is "wasted" on ground you give back to descents along the way. This is an undulating climb, not a smooth ramp. Every metre lost has to be reclaimed, so your legs do more work than the net figure suggests, and the descents rarely offer real recovery at these gradients.

How the Gradient Unfolds

The 16.64% average is a blend, not a constant. On a climb this steep, that average hides ramps well above it and short pitches where the road eases. With 142 m of descent folded into the profile, expect abrupt changes in pitch rather than a steady grind.

• Short recovery or descending sections that briefly interrupt the climbing but demand you re-accelerate
• Repeated punchy climbs stacked back to back, each one clawing back lost elevation
• The steepest ramp hitting 37.11%, a wall that will force you out of the saddle or into your lowest gear

Pacing Notes

Forget even-speed pacing here. On a climb with this much undulation, chasing a constant speed will spike your effort on every ramp and blow you up early. Instead, target an even effort based on your sustainable power output: hold a steady, repeatable wattage and let your speed rise and fall with the gradient.

Let the descents and flatter pinches be genuine soft-pedal moments, then meter your power back on as the road tilts up again. Before you ride, confirm your threshold with the FTP estimator so your target number reflects your current form, not a stale figure.

Gearing

The 37.11% maximum gradient dictates your setup. A standard chainset will leave you grinding to a stall. Fit a compact or sub-compact chainset paired with a wide-range cassette, something like 34×32 or 34×34, so you always have a bailout gear on the steepest ramps. Check your drivetrain the day before, not at the trailhead.

Summary

• Length: 6.7 km
• Average gradient: 16.64%
• Maximum gradient: 37.11%
• Net elevation gain: 1,123 m
• Total ascent: 1,265 m
• Category: HC

Collado de la Cruz de Guardia rewards discipline over ambition. Pace by effort, gear low, and respect the undulation, and this HC monster becomes a challenge you finish rather than one that finishes you.