Col de Montségur

Overview

Col de Montségur is a Category 2 climb in France, running 13.9 km from a valley floor at 502 m up to a summit at 1059 m. On paper it reads as a moderate ascent: a net elevation gain of 557 m over nearly fourteen kilometres, for an average gradient just north of 4%. That average places it firmly in the accessible range for most trained riders, and the modest summit altitude keeps thin air out of the equation.

The average, though, tells only part of the story. While the net elevation gain is 557 m, the total ascent is 723 m — a difference of 166 m. That gap is undulation: the road repeatedly gives back altitude before clawing it up again. Every metre descended mid-climb is a metre you have to re-earn, and it breaks any rhythm you try to settle into. Expect the effort to feel harder than a 4.02% average suggests.

How the Gradient Unfolds

A 4.02% average is a blend, not a description. With 166 m of extra ascent baked into the profile, long stretches sit well below average while short pitches spike well above it — capped by a maximum gradient of 24.96%, a wall you will not spin over casually.

• Flatter and false-flat sections where the road eases or briefly descends, letting you recover but also killing momentum.
• Repeated short climbs stacked back to back, each one demanding a fresh surge of effort.
• A steepest ramp touching 24.96%, sharp enough to force you out of the saddle if your gearing is not deep enough.

Pacing Notes

On a smooth, steady climb you can chase even speed. Here, the undulation makes that a trap: holding constant speed over the 24.96% ramps would spike your power into the red and cook you before the summit. Pace to even effort instead. Anchor your work to a target power tied to your sustainable power output, let speed rise on the flatter sections, and accept that you will slow on the walls rather than blowing your effort ceiling to defend a number. If you do not know your threshold, run the FTP estimator before you go, then ride the climb a notch below it.

Gearing

The 24.96% maximum dictates your setup, not the gentle average. Fit a compact (34-tooth inner) or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you a bailout low enough to keep the cranks turning on the steepest ramp without grinding to a stall. Check your chainrings and cassette before the ride; discovering you are over-geared halfway up a 24.96% pitch is not the moment to find out.

Summary

• Length: 13.9 km
• Average gradient: 4.02%
• Maximum gradient: 24.96%
• Net elevation gain: 557 m
• Total ascent: 723 m
• Category: 2

Col de Montségur is easy to underestimate. Its 4.02% average invites complacency, but the 166 m of hidden ascent and a 24.96% ramp reward riders who pace to effort and arrive with the right gears.