Passo Colombo

Overview

Passo Colombo is a category 2 ascent that packs a serious punch into a compact 7.9 km. From a start elevation of 189 m to a summit of 728 m, it delivers a net gain of 539 m at an average gradient of 6.85%. That average alone marks it as a genuine climb rather than a rolling drag, but the number that defines Passo Colombo is its 23.04% maximum. A pitch that steep is the kind of wall that redraws your pacing plan the moment you hit it. With a total ascent of 519 m recorded across the profile, this is a climb that asks for respect from the first pedal stroke.

How the Gradient Unfolds

The gap between the 6.85% average and the 23.04% maximum tells you everything about the shape here: Passo Colombo is not a uniform ramp. To average 6.85% over 7.9 km while spiking above 23% somewhere along the way, the climb must offer sections that dip well below the mean to balance out those brutal pitches. Expect the effort to come in waves. Stretches where you can settle into a rhythm are punctuated by sharp, steep ramps that force you out of the saddle and spike your heart rate. The 539 m of net gain arrives unevenly, and reading the road ahead matters far more here than on a steady climb of the same length.

Pacing Notes

Steep, variable climbs like this one punish riders who bury themselves on the first ramp. The smart approach is to anchor your effort to a sustainable power target rather than chasing the gradient. Ride the shallower sections just below your FTP so you have headroom for the 23.04% wall without going into the red. If you do not know your threshold, run the numbers through the FTP estimator before you go — pacing a climb this punchy is far easier when you know exactly what you can hold. On the steepest pitch, accept that you will briefly exceed threshold; the goal is to keep those surges short and recover on the gentler grades that follow.

Gearing

With a 23.04% maximum and an overall length of 7.9 km, gearing is not a place to be brave. A compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will get most fit riders over the climb, but on a pitch this steep a 34×34 gives you a genuinely useful extra margin to keep your cadence up and your knees intact. If your setup allows something even easier, take it — spinning a low gear up the 23% ramp beats grinding it and blowing your legs for the rest of the 6.85% average.

Summary

Passo Colombo is a short but sharp category 2 climb that rewards patience and low gearing. Respect the 23.04% max, pace off your threshold, and the 539 m of climbing will come without drama.

Length: 7.9 km
Average gradient: 6.85%
Max gradient: 23.04%
Start: 189 m
Summit: 728 m
Net gain: 539 m
Total ascent: 519 m
Category: 2