Croce Domini Pass

Overview

Croce Domini Pass is an hors catégorie (HC) climb, the hardest classification there is, sitting above categories 1 through 4. Over 15.6 km it lifts you from a start elevation of 271 m to a summit at 1884 m, a net gain of 1613 m. The average gradient is a relentless 10.33%, and the total ascent comes to 1589 m — a figure just shy of the net gain, telling you this is an almost uninterrupted upward drag with barely any respite along the way.

Numbers rarely lie, and these paint a clear picture: this is a long, savagely steep effort with a peak pitch of 24.58%. There is nowhere here to hide.

How the Gradient Unfolds

A 10.33% average over 15.6 km is punishing on its own, but averages conceal the real story. With a maximum gradient of 24.58%, individual ramps here more than double the mean — the kind of walls that force you out of the saddle whether you planned to stand or not.

Because the total ascent (1589 m) sits so close to the net gain (1613 m), you can read this climb as one continuous rise rather than a rolling profile with descents to recover. The gap between those two numbers is just 24 m, meaning the road essentially only goes up. Expect long sustained sections holding well into double digits, punctuated by sharper kicks that spike toward that 24.58% ceiling. The steepest pitches are what you must budget for, not the average.

Pacing Notes

On a climb this long and this steep, pacing is everything. The temptation is to attack the early slopes, but with 15.6 km and 1613 m of vertical ahead, a blown effort in the first third leaves nothing for the walls above. Anchor your effort to your FTP and hold a sustainable power rather than chasing the gradient. If you don't yet know your threshold, the FTP estimator will give you a working figure to plan around.

Ride the 10.33% average sections at a controlled tempo, then accept that the ramps toward 24.58% will briefly push you over threshold — that's unavoidable, so keep those surges short and settle back down as soon as the road relents. Over 1613 m of gain, consistency beats heroics every time.

Gearing

Do not under-gear this one. With a 10.33% average stretching across 15.6 km and pitches touching 24.58%, you want the lowest ratios you can fit. A compact 34-tooth chainring paired with a wide cassette is the baseline. A 34×32 is the minimum many strong riders will want, but on a climb of this severity — HC, with 1613 m to grind out — a 34×34 gives you the extra room to keep your cadence up on the steepest walls without grinding to a stall. If your frame and derailleur can accommodate even more range, take it. Spinning a low gear preserves your legs across 1589 m of total ascent far better than mashing a big one.

Summary

Croce Domini Pass is a genuine HC test: long, unrelentingly steep, and gaining over 1600 m with almost no recovery. Gear low, pace to your threshold, and respect the walls near the summit.

Length: 15.6 km
Average gradient: 10.33%
Max gradient: 24.58%
Start: 271 m
Summit: 1884 m
Net gain: 1613 m
Total ascent: 1589 m
Category: HC