Bocchetta Portule

Overview

Bocchetta Portule is a genuine hors catégorie climb, and the numbers leave no doubt about it. Over 24.6 km the road lifts you from a valley floor at 248 m all the way to a summit at 2061 m, a net elevation gain of 1813 m. The average gradient across that whole span is 7.36%, which for a climb this long is relentless — there is no gentle valley approach softening the average here. This is a sustained, altitude-gaining effort measured in hours rather than minutes, and it demands respect from the first pedal stroke.

How the Gradient Unfolds

The defining feature of Portule is its consistency at a punishing level. A 7.36% average sustained over 24.6 km means the climb rarely relents into recovery. With a net gain of 1813 m against a total ascent of 1844 m, only 31 m of that road is spent descending or flat — the rest is uphill. In practice that means you are almost always climbing, and the gradient sits at or above threshold-inducing steepness for the majority of the ascent. You cross a huge vertical range too, from 248 m near the base up into thin air at 2061 m, so the final kilometres will feel harder than the raw percentage suggests as oxygen thins toward the summit.

Pacing Notes

On a climb of this length, discipline wins. Set your effort just under your FTP for the opening two-thirds and hold something in reserve for the altitude-affected final stretch above 2000 m. Going into the red early on a 24.6 km, 7.36% wall is the classic mistake — the climb is long enough to punish any surge. If you are unsure of your numbers, run through the FTP estimator before you ride so you can anchor your power targets. Aim to arrive at the summit having spent your energy evenly across all 1813 m of gain rather than front-loading the effort.

Gearing

You will want climbing gears and then some. For most riders a compact 34-tooth inner ring paired with a wide cassette is the sensible baseline: a 34×32 is the minimum I would bring to a 7.36% average over 24.6 km, and if you are not racing or you weigh a little more, step up to a 34×34 for a lower bail-out ratio on the sustained steep sections. The extra range costs almost nothing and buys you the ability to spin rather than grind through the highest, most oxygen-starved kilometres near 2061 m.

Summary

Bocchetta Portule is one of those climbs that earns its HC rating on length and altitude alone. Come with fresh legs, sensible gearing, and a patient plan, and the 1813 m of gain will reward you with one of the great summit payoffs in the sport.

Length: 24.6 km
Average gradient: 7.36%
Max gradient: n/a
Start: 248 m
Summit: 2061 m
Net gain: 1813 m
Total ascent: 1844 m
Category: HC