Col de Mary

Col de Mary cycling climb profile

Col de Mary is an HC climb in Italy with the kind of profile that rewards restraint more than aggression. The headline is simple enough: 21 km at an average gradient of 7.31%, starting at 950 m and finishing at 2485 m. That gives it 1535 m of net elevation gain, which is a large amount of vertical to absorb in one sustained effort.

The important point is not just that the climb is long, but that the average gradient is already demanding before the steepest sections are considered. A 7.31% average over 21 km means there is very little room to treat the opening as a warm-up if the goal is to ride well all the way to the summit. Any early over-pacing compounds quickly because the climb keeps asking for pressure on the pedals long after the first signs of fatigue appear.

How the gradient rides

The available profile points to a sustained climb rather than a short ramp-based effort. The average gradient sits high enough that most riders will be climbing continuously, while the maximum gradient of 10.79% means the hardest moments are steep enough to punish poor gearing or an over-ambitious early tempo.

That makes Col de Mary less about one decisive wall and more about managing a long accumulation of load. The difference between the average gradient and the maximum gradient suggests the steepest sections are significant, but not wildly detached from the general character of the climb. In practical terms, expect a climb where the baseline effort is already substantial, then be ready for pitches that push cadence down and force a decision: lift power briefly, or shift early and keep the effort controlled.

Pacing and gearing

The safest pacing strategy is to ride the first part below the effort you think you can hold. On a climb this long, the cost of going too hard early is paid near the top, where the elevation is higher and the accumulated vertical is already in the legs. If using /glossary/ftp as a guide, this is the sort of ascent where smooth pacing around a sustainable climbing effort matters more than repeated surges.

Gearing should be chosen for the 10.79% maximum gradient, not the 7.31% average. If the easiest gear only feels comfortable on the average sections, it will be too tall when the road reaches its steepest pitch. A proper climbing setup gives room to stay seated, keep traction consistent, and avoid turning the upper half of the climb into a grind.

Practical ride notes

• Start conservatively because 21 km is long enough for small pacing errors to become decisive.
• Keep cadence protected with a low climbing gear for the steepest 10.79% sections.
• Fuel and drink before the effort starts to feel urgent, since 1535 m of net gain makes this a full climbing objective, not a short test.
• Treat the summit at 2485 m as the end of the effort, not the point where you hope to recover from earlier mistakes.