Col de Soladier

Overview

Col de Soladier is a hors catégorie (HC) climb in Switzerland, rising from a start elevation of 449 m to a summit at 1,577 m. Over its 10.7 km it delivers a net elevation gain of 1,128 m, and its average gradient of 10.49% marks it as one of the more relentless paved ascents you will meet. There is no easing-in ramp here to hide behind; the average alone tells you this is a sustained, upper-limit effort from bottom to top.

The number that reframes the day is total ascent: 1,396 m against a net gain of 1,128 m. That 268 m gap means the road gives back roughly a quarter of its climbing in short descents and false flats, then forces you to earn it again. Undulation like this raises the true cost of the climb well above what the net figure suggests, because every dip demands a re-acceleration and a fresh surge back onto grade.

How the Gradient Unfolds

A 10.49% average is punishing on its own, but it flattens out the reality of the profile. With a maximum gradient of 31.9%, there is at least one ramp far steeper than anything the average implies, and the 268 m of re-climbing confirms the road is not a smooth staircase. Expect the pitch to swing hard around the mean.

• Short recovery sections and false flats where the road briefly kicks downhill before climbing again
• Repeated short climbs stacked back to back, each one resetting your rhythm
• A savage steepest ramp near 31.9% that will pull you out of the saddle regardless of gearing

Pacing Notes

On an undulating HC climb, chase even effort, not even speed. Anchor your ride to a sustainable power output you can hold for the full duration, then let your speed rise and fall with the grade. Do not attack the 31.9% ramp; accept a slow crawl there and protect your legs for the sustained mid-teens pitches that follow. Fighting to hold pace over the steepest sections is the fastest way to blow up. If you are unsure of your ceiling, run the numbers through the FTP estimator before you commit to a target for the day.

Gearing

The 31.9% maximum gradient governs your setup, not the average. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 is the sensible minimum, and going lower is defensible on a climb this steep. Check your drivetrain before the ride: confirm the chain reaches the largest sprocket cleanly and the rear derailleur has the capacity to handle it. Discovering you are over-geared mid-ramp is not recoverable.

Summary

• Length: 10.7 km
• Average gradient: 10.49%
• Maximum gradient: 31.9%
• Net elevation gain: 1,128 m
• Total ascent: 1,396 m
• Category: HC

Col de Soladier is a genuine HC test: sustained double-digit grades, a brutal steepest ramp, and 268 m of hidden re-climbing that punish anyone pacing by speed. Bring low gearing, ride to effort, and respect the profile.