Colle di Val Molina

Overview

Colle di Val Molina is an hors catégorie ascent that leaves very little room for negotiation. Over 17.7 km it averages 9.39%, a figure that would be brutal on a short climb and becomes genuinely intimidating when sustained across this kind of distance. From a start elevation of 298 m it hauls you to a 1959 m summit, a net elevation gain of 1661 m. Total ascent registers at 1577 m, so the road never really relents into descent — nearly every metre is spent going up. This is a climb that rewards patience and punishes anyone who treats the early kilometres as a warm-up.

How the Gradient Unfolds

The defining number here is that 9.39% average. On most climbs an average in this range hides long stretches of flatter recovery balanced against steeper walls. Here the difference between the average and the 22.01% maximum tells the real story: the hardest ramps are more than double the mean, spiking to over a fifth in vertical gain across their steepest sections. Expect the road to pitch up hard and hold there. Because total ascent (1577 m) sits just below net gain (1661 m), there are almost no downhill breathers to reset your legs. The gradient unfolds as a long, grinding wall rather than a series of distinct steps, and the 22.01% pitches are where races are won or lost.

Pacing Notes

At 17.7 km and 9.39%, this is a sustained-effort climb where discipline matters more than punch. Ride it as a threshold effort anchored to your FTP, holding a steady wattage rather than chasing the gradient every time it kicks. The 22.01% ramps will force short surges above threshold — accept them, then settle back down as soon as the road eases. If you go into the red early, the remaining distance to the 1959 m summit will expose it mercilessly. If you don't know your number, run it through the FTP estimator before you plan a target for the full 1661 m of climbing. Fuel and hydrate as though this is one long time trial, because effectively it is.

Gearing

Do not under-gear this one. With a 9.39% average sustained for 17.7 km and pitches hitting 22.01%, you want the widest range you can fit. A compact 34-tooth chainring paired with a wide-range cassette is the sensible starting point. A 34×32 is the minimum most riders should consider here, and even strong climbers will be grateful for a 34×34 when the road tilts toward its steepest. If your setup allows anything larger than a 34 at the rear, take it — spinning a low gear across 1661 m of gain will preserve your legs far better than grinding a ratio that is a shade too tall.

Summary

Colle di Val Molina is a true HC test: long, steep, and unforgiving from bottom to top. Gear low, pace to your threshold, and respect the distance.

Length: 17.7 km
Average gradient: 9.39%
Max gradient: 22.01%
Start: 298 m
Summit: 1959 m
Net gain: 1661 m
Total ascent: 1577 m
Category: HC