Colle delle Vallette

Overview

Colle delle Vallette is a hors catégorie (HC) climb in Italy, running 10 km from a valley start at 458 m to a summit at 1,631 m. That is a net elevation gain of 1,173 m over the ascent, and at HC status it sits in the hardest tier of categorized climbs. An 11.75% average across 10 km is severe by any standard, and the profile does not offer the long, steady tempo that a single average number implies.

The gap between the numbers is the real story. The climb nets 1,173 m of gain but records 1,585 m of total ascent. That extra 412 m is climbing you do twice: terrain that rolls up, drops, and forces you to regain height. Every descent inside the climb costs you the elevation you already earned, so the effort is punchier and more variable than the net figure suggests. Plan for the total ascent, not the net gain.

How the Gradient Unfolds

The 11.75% average is a blend of pitches far steeper and stretches far shallower. Because the climb undulates, the mean is pulled down by descents and dragged up by the ramps. Expect the gradient to swing rather than settle.

• Flatter or descending recovery sections where you can shift up, breathe, and eat
• Repeated short climbs that reset your effort each time you crest and drop
• A steepest ramp well into double digits, sharp enough to force you out of the saddle

Read the road ahead rather than the average. The hardest metres are concentrated in short, steep bursts between the rolling sections.

Pacing Notes

On a smooth climb you would ride even-effort and let speed vary. Here the undulation makes that harder: descents tempt you to coast and the ramps spike your power. Anchor your effort to your sustainable power output and hold a steady ceiling on the steep pitches rather than chasing a speed target. Use the recovery sections to actively drop power, not just to hang on. If you do not know your threshold, run the FTP estimator first, then set a realistic cap you can defend across all 10 km and its 1,585 m of climbing.

Gearing

Gear for the steepest pitch, not the average. On a climb this steep, bring a compact or sub-compact chainset paired with a wide-range cassette, something like a 34×32 or 34×34, so you keep a spinnable cadence when the ramp bites. Grinding a big gear on the steep sections will cook your legs before the summit. Check your chainrings and cassette before the ride, not at the trailhead.

Summary

• Length: 10 km
• Average gradient: 11.75%
• Net elevation gain: 1,173 m
• Total ascent: 1,585 m
• Category: HC

Colle delle Vallette rewards riders who respect the total ascent over the net gain. Pace to your threshold, gear low, and treat every descent as height you will have to earn back.