Sella del Monte Zoncolan

Overview

Sella del Monte Zoncolan is an HC climb — hors catégorie, the hardest rating there is — and the numbers explain why. Over just 8.7 km it drags you from a start elevation of 506 m to a summit of 1736 m, a net gain of 1230 m with 1191 m of total ascent. The average gradient is a brutal 14.07%, and the steepest pitch bites at 25.31%. There is almost no relief built into this profile: when a climb averages more than fourteen percent across nearly nine kilometres, "flat" simply does not exist. This is a sustained, full-body effort where the only strategy is to survive each ramp and keep the pedals turning.

How the Gradient Unfolds

The shape here is defined by relentlessness rather than variety. With a 14.07% average and a 25.31% maximum, the difference between the typical slope and the hardest slope is only about eleven percentage points — meaning even the "easier" sections are savage. Because net gain (1230 m) slightly exceeds total ascent (1191 m), the road climbs almost continuously, with only tiny dips or false flats to interrupt it. Expect the gradient to sit in the mid-teens for long stretches and then spike toward that 25.31% maximum on the steepest ramps. These are the moments where cadence collapses and momentum vanishes, so read the road ahead and pick your line before each pitch arrives.

Pacing Notes

On a climb this steep, pacing is everything. At 8.7 km you might be tempted to attack, but 14.07% average punishes any effort above threshold early. Anchor your ride to your FTP: riding just under it on the shallower sections buys you the headroom to absorb the 25.31% spikes without blowing up. If you don't know your number, run it through the FTP estimator before you commit. The goal is a steady power ceiling, not heroics — surging on a wall this long costs far more than it gains. Break the 1230 m of climbing into segments and treat each ramp as its own effort.

Gearing

Do not under-gear this climb. A 14.07% average with ramps to 25.31% will overwhelm anything built for rolling terrain. A 34×32 is the bare minimum, and even strong climbers will be grinding on the steepest pitches. For most riders, a 34×34 is the smarter choice — that extra sprocket keeps your cadence alive when the slope hits its 25.31% maximum and protects your knees across 1191 m of total ascent. If your setup allows an even wider range, use it. On Zoncolan, spinning a low gear always beats grinding a high one.

Summary

Sella del Monte Zoncolan is a pure test of climbing endurance: short in distance, merciless in gradient, and rated HC for good reason. Gear low, pace to your threshold, and respect every ramp.

Length: 8.7 km
Average gradient: 14.07%
Max gradient: 25.31%
Start: 506 m
Summit: 1736 m
Net gain: 1230 m
Total ascent: 1191 m
Category: HC