Halsljoch - Passo di Lazins

Overview

Halsljoch - Passo di Lazins is a hors catégorie climb, the hardest rating on the scale, and it earns the label without any need for embellishment. Over 12.5 km the road lifts you from 294 m to a summit of 1495 m, a net gain of 1201 m and a total ascent of 1186 m once the small dips along the way are counted. The average gradient is a relentless 9.61%, and the steepest pitch bites at 19.04%. This is a climb that asks for respect from the first pedal stroke and rarely lets you off the hook.

How the Gradient Unfolds

An average of 9.61% held across 12.5 km tells you almost everything: there is very little in the way of recovery. With a net gain of 1201 m spread over the full 12.5 km, the road tips upward the moment it leaves 294 m and keeps climbing to 1495 m. The gap between the 9.61% average and the 19.04% maximum is the story here — those double-digit ramps are not brief novelties but repeated demands that drag the average up. Expect the hardest ramps to arrive when your legs are already loaded, and treat every stretch that eases toward the average as the rest it is, because at 9.61% mean gradient there is no true flat to hide in.

Pacing Notes

On a climb this steep and this long, pacing is the difference between finishing strong and detonating early. Anchor your effort to your FTP and hold a steady, sustainable power rather than chasing the terrain. The 19.04% pitches will spike your output no matter how disciplined you are, so bank a small buffer below threshold on the more "average" 9.61% sections to absorb those surges without going into the red. If you do not know your threshold, run the numbers through the FTP estimator before you commit to a target — 12.5 km at 9.61% is not the place to discover you started too hot. Break the climb into thirds mentally and reassess how you feel at each, keeping something in reserve for the upper slopes toward 1495 m.

Gearing

Do not under-gear this one. With an average of 9.61% and ramps to 19.04%, you want a compact chainset paired with a wide-range cassette. A 34×32 is the sensible floor for strong climbers, giving you a low enough ratio to keep cadence on the sustained 9.61% grades. But given the 19.04% maximum and the sheer 12.5 km length, most riders will be far happier on a 34×34, which buys precious extra torque for the steepest ramps and lets you spin rather than grind toward the 1495 m summit. If your bike allows an even easier bailout gear, there is no shame in fitting it here.

Summary

Halsljoch - Passo di Lazins is a genuine HC test: sustained, steep, and long enough that pacing and gearing matter as much as fitness. Come with a plan, low gears, and patience.

Length: 12.5 km
Average gradient: 9.61%
Max gradient: 19.04%
Start: 294 m
Summit: 1495 m
Net gain: 1201 m
Total ascent: 1186 m
Category: HC