Col de Prato

Overview

Col de Prato is a Category 1 climb in France, running 9.3 km from a base at 202 m to a summit at 983 m. That gives a net elevation gain of 781 m and an average gradient of 8.36% — steep enough to keep you honest for the full distance, with no true respite built into the headline number.

But the headline number understates the work. The total ascent is 936 m, well above the 781 m of net gain. That 155 m gap tells you the road is not a clean, monotonic climb: it dips and rises along the way, meaning you lose altitude you then have to reclaim. Every metre of that undulation is extra vertical effort that does not show up in the start-to-summit math, so plan your legs for 936 m of climbing, not 781.

How the Gradient Unfolds

An 8.36% average on an undulating road hides both easier and much harder terrain. Because the profile gives back 155 m of descent along the way, the sustained climbing sections must be steeper than the average to still net 781 m over 9.3 km. Expect the pitch to swing rather than hold steady.

• Short flatter or descending sections that offer brief recovery — but also erase altitude you must earn back
• Repeated ramps that reset your rhythm each time the road tilts up again
• A steepest ramp reaching 30.38%, far above the average — a wall that demands your lowest gear

Pacing Notes

On a climb this uneven, do not chase an even speed — the undulation would force surges on every ramp and shred your legs. Instead, ride to an even effort, holding a steady sustainable power output and letting your speed rise and fall with the gradient. Ease slightly on the flatter and descending stretches rather than hammering to hold pace, and save your matches for the steep ramps where they count. If you do not know your ceiling, run the numbers through the FTP estimator before you commit to a target.

Gearing

The 30.38% maximum gradient governs your setup, not the average. That pitch is steep enough to stall a standard chainset, so come with a compact or sub-compact crank paired to a wide-range cassette — think 34×32 or 34×34 at minimum. The goal is to keep your cadence spinning on the wall rather than grinding to a near-stop. Check your chainset and cassette before the ride; discovering you are over-geared halfway up a 30% ramp is not a problem you can fix on the road.

Summary

• Length: 9.3 km
• Average gradient: 8.36%
• Maximum gradient: 30.38%
• Net elevation gain: 781 m
• Total ascent: 936 m
• Category: 1

Col de Prato is a short but relentless Category 1 effort where the undulation adds 155 m of climbing beyond the net gain. Pace it by effort, gear it for the steepest ramp, and respect the extra vertical the profile hides.