Col de la Case d'Oche

Overview

The Col de la Case d'Oche is a hors catégorie ascent, the hardest rung on the climbing ladder above categories 1 through 4. It runs 20.2 km from a valley floor at 392 m all the way to a 1887 m summit, a net elevation gain of 1495 m. Averaged across the full distance, the gradient sits at 7.38% — a number that already promises a long, sustained effort. But averages flatter a climb like this. With a total ascent of 1457 m logged over the ride, the road offers only the slightest respite here and there; the difference between the 1495 m of net gain and the 1457 m of measured ascent tells you the descents are almost nonexistent. This is a climb you settle into for well over an hour and simply do not escape.

How the Gradient Unfolds

A 7.38% average over 20.2 km would be demanding on its own. What lifts the Case d'Oche into HC territory is the spread between that average and its 27% maximum. Ramps that steep are nearly four times the average slope, and they force you out of any comfortable rhythm you have built. Expect the pattern of a genuine mountain road: stretches close to the mean where you can find a cadence, punctuated by pitches that spike far above it. Because the total ascent of 1457 m tracks so closely to the 1495 m net gain, there is no rolling relief to reset your legs — every metre of the 1495 m climbed has to be earned upward. Ration your matches for the steep sections rather than burning them on the merely hard ones.

Pacing Notes

On a 20.2 km climb, discipline beats bravado. The sustainable approach is to hold an effort just below your FTP on the 7.38% sections and accept that the 27% ramps will briefly push you into the red — that spillover is unavoidable, so let it be short. If you do not know your threshold number, run the figures through the FTP estimator before you commit to a target. Climbing 1495 m rewards riders who start conservatively; the summit at 1887 m is a long way from the 392 m start, and going too hard in the opening kilometres is the surest way to unravel near the top.

Gearing

Come prepared to spin. For an HC climb averaging 7.38% with pitches to 27%, a compact chainring paired with a wide-range cassette is the sensible baseline. A 34×32 is the minimum most riders will want here, and on the steepest ramps a 34×34 buys precious extra cadence when the 27% slope threatens to stall you. If your setup allows anything easier, the 1495 m of climbing will make you grateful for it. The goal is to protect your knees and keep the pedals turning through every steep metre.

Summary

The Col de la Case d'Oche is a full HC test: long, relentless, and punctuated by ramps steep enough to demand your easiest gear. Pace it patiently, gear it generously, and respect the 1495 m standing between the start and the summit.

Length: 20.2 km
Average gradient: 7.38%
Max gradient: 27%
Start: 392 m
Summit: 1887 m
Net gain: 1495 m
Total ascent: 1457 m
Category: HC