Passo di Campo

Overview

Passo di Campo is a hors catégorie (HC) climb — the hardest rating there is, sitting above categories 1 through 4 — and it earns that label the honest way: through sheer length. At 35.6 km it is less a climb than an afternoon, starting at 398 m and topping out at 2291 m. That is 1893 m of net elevation gain, with 1932 m of total ascent once the small dips and false flats are accounted for. The average gradient of 5.31% sounds almost gentle, but on a climb this long the average hides everything. A shorter, steeper wall can be muscled through; here you have to make peace with the fact that you will be climbing for a very long time.

How the Gradient Unfolds

The 5.31% average is a trap for the unwary. Spread across 35.6 km, that number smooths over a wildly uneven profile — the 39 m gap between the 1893 m net gain and the 1932 m total ascent tells you the road pitches up, eases, and occasionally tips down before climbing again. Somewhere in this ribbon of tarmac sits a maximum gradient of 27.3%, a pitch steep enough to stop a poorly-geared rider dead. Ramps like that on a climb this length are morale-breakers precisely because they arrive when your legs are already deep into the effort. Expect long, sustained stretches around and just above the average, punctuated by sharper kicks that force you out of rhythm.

Pacing Notes

On a 35.6 km climb, discipline beats bravado. Your single most useful reference is your FTP — the power you can hold for roughly an hour. Ride the lower slopes noticeably below that ceiling, because you are asking your body to work for far longer than an hour. If you do not know your number, run it through the FTP estimator before you commit to a target. Bank nothing on the early kilometres; the 27.3% ramp and the upper slopes near 2291 m, where thinner air taxes every pedal stroke, are where a climb like this is won or lost. Fuel early and often — the finish is a long way from the 398 m start.

Gearing

Gear for the steepest moment, not the average. A 5.31% mean is manageable, but a 27.3% pitch after 30-plus kilometres demands a bailout ratio you can spin. A compact 34-tooth chainring paired with a 34×32 cassette is a sensible baseline for strong climbers. For most riders — and for anyone who wants to protect their legs across all 35.6 km — a 34×34 gives you that extra margin to keep cadence up when the road rears toward its 27.3% max. Err toward the easier ratio; you will never regret a spare gear on a climb this long.

Summary

Passo di Campo rewards patience over power. It is long, uneven, and topped by thin air at 2291 m, with one brutal ramp to survive. Pace conservatively, gear generously, and let the kilometres come to you.

Length: 35.6 km
Average gradient: 5.31%
Max gradient: 27.3%
Start: 398 m
Summit: 2291 m
Net gain: 1893 m
Total ascent: 1932 m
Category: HC