Col de Longet

Col de Longet cycling climb profile

The Col de Longet cycling climb is an HC ascent in Italy with the kind of profile that punishes impatience more than raw weakness. On paper, 61 km at an average gradient of 3.76% can look manageable. In practice, that average is the least useful number if it tempts you into riding it like a steady tempo climb.

The route starts at 357 m and finishes at 2,654 m, gaining 2,297 m from bottom to summit. That is the defining feature. This is a long-duration climbing effort where the aerobic cost compounds over time, and the summit elevation means the final part of the climb will not feel like the opening kilometres, even at the same power.

How the gradient unfolds

The headline average of 3.76% tells you the climb spreads its elevation gain across a very long distance. That points to extended sections where speed can stay relatively high and momentum matters. But the maximum gradient of 22.66% changes the tactical picture completely.

A climb with this much length and such a high maximum gradient is not a simple metronomic ascent. The average is diluted by easier terrain, while the steepest ramps are severe enough to force real torque and cadence decisions. This is the kind of profile where riders who chase speed on the shallower portions can arrive at the steep ramps already carrying too much fatigue.

The correct mental model is not '61 km at under 4%'. It is a long approach to repeated load, capped by the need to survive gradients that can more than quintuple the average. That makes pacing discipline more important than confidence.

Pacing strategy

Ride the lower part as a controlled endurance-to-tempo effort, not as a test of form. The climb is too long to justify early surges unless the ride objective is specifically race simulation. If using power, anchor the effort around sustainable climbing intensity and keep enough margin for the steepest sections. For guidance on setting those zones, use /glossary/ftp or estimate your baseline with /tools/ftp-estimator.

The main mistake is treating the easier gradients as free speed. They are not free if they push you above your sustainable ceiling before the road reaches its hardest pitches. Let the shallow sections stabilize breathing, eating, and cadence. Save the harder efforts for where the gradient forces them.

Gearing notes

The 22.66% maximum gradient is the gearing clue. Even strong riders should think in terms of keeping a bailout gear available, because on a climb this long, steep ramps late in the ride demand a different gear than the same ramp when fresh.

A wide-range climbing setup is the safer choice than a tight cassette built for steady gradients. The goal is not just to clear the steepest pitch. It is to clear it without grinding so hard that the next kilometre becomes recovery by necessity.

How to ride it well

The Col de Longet rewards patience, fuel discipline, and conservative gear choice. Start easier than the average gradient suggests, keep cadence smooth where the road allows it, and assume the steepest ramps will matter more because of everything that came before them. The climb is classified HC for a reason: not because every metre is brutally steep, but because 61 km, 2,297 m of net elevation gain, and a summit at 2,654 m turn small pacing errors into expensive ones.