Colle della Croce

What Kind of Climb Is Colle della Croce?

Colle della Croce is a Hors Catégorie climb that earns its classification without ambiguity. Over 15 km it delivers 2,166 m of total ascent, starting at 710 m elevation and topping out at 2,242 m. That's a sustained, relentless elevation gain with virtually no meaningful recovery terrain built in.

The average gradient of 10.22% already places this in the upper tier of Alpine-style climbs — a number that demands respect on its own. Then there's the maximum gradient of 46.88%, a figure that belongs in a different category of difficulty entirely. Ramps at that pitch are not negotiable at tempo; they require a full stop of the planned effort and a purely survival-mode output.

How the Gradient Unfolds

With a 10.22% average sustained across 15 km, there is no soft introduction. The climb begins at 710 m and the math leaves little room for easy lower slopes to offset the brutal upper sections. Expect the gradient to stay consistently steep through the middle kilometers, the kind of terrain where your FTP sets the ceiling on what's sustainable.

The 46.88% maximum gradient is an outlier even by HC standards. Statistically, a ramp of that severity is likely short and localized — a wall section or a hairpin approach — but it will demand:

• A complete reduction in speed before entry
• Your lowest available gear, ideally a compact or sub-compact chainring paired with a 32-tooth or larger cassette sprocket
• Out-of-saddle effort with full body engagement to maintain forward momentum
• A controlled breathing reset immediately after the section passes

Ignoring that ramp and arriving at it over-geared or already fatigued is one of the more reliable ways to crack on this climb.

Pacing Strategy

On a climb averaging 10.22% over 15 km with 2,166 m of ascent, pacing from power is not optional — it's the primary tool. Going by feel on gradients this steep almost always results in overcooking the first third.

Practical approach:

• Settle below threshold in the opening 3–4 km. The sustained nature of this climb means any early excess compounds. There is no flat section ahead to recover on.
• Target a sustainable power band through the middle kilometers. With the average sitting above 10%, the middle section is not a respite — it is the main event.
• Conserve before the maximum gradient ramp. Identify it on your head unit or GPS profile before the ride. Arrive at it with something left.
• Cadence management matters. Many riders default to grinding a big gear on steep alpine climbs. On a wall section approaching 47%, a higher cadence and lower gear is almost always the mechanically sound choice. Muscle fatigue from torque-heavy grinding at 10%+ will arrive well before the summit at 2,242 m.

Gearing Notes

A standard 50/34 compact paired with an 11-28 cassette is marginal for repeated gradients at this average. For riders without a specific power-to-weight advantage, a 30-tooth or 32-tooth large sprocket is sensible. The 46.88% maximum pitch makes a strong case for the largest cassette your drivetrain will accept. Under-gearing this climb costs you seconds; over-gearing it can cost you the summit.

If you're benchmarking your readiness for climbs of this profile, the FTP estimator gives a starting point for calculating sustainable wattage across a 15 km effort at these gradients.