Col du Mollard

Overview

The Col du Mollard is an Hors Catégorie climb in France that earns its rating honestly. Starting at 592 m and finishing at 1,627 m, the road delivers 1,035 m of net elevation gain across 11.9 km — an average that places it firmly in the demanding tier of Alpine ascents. The total recorded ascent of 1,456 m hints at the road's irregular character: this is not a steady ramp, and the gap between total ascent and net gain tells you there are punchy undulations baked into the profile.

Gradient Profile

At 8.68% average across 11.9 km, the Col du Mollard sits in consistently uncomfortable territory from the base upward. That average is not inflated by a single brutal headwall — it reflects sustained, relentless climbing throughout. The maximum recorded gradient of 35.19% is, by any measure, exceptional. Ramps approaching that figure are effectively unrideable for most athletes without stopping, and even strong climbers will be in survival mode through the steepest pitches.

Expect the climb to feel manageable in its earlier kilometers before the gradient ratchets up. The sections driving the maximum toward 35% tend to appear mid-to-upper climb, where accumulated fatigue compounds the steepness. There are no flat recovery segments worth banking on.

Key gradient checkpoints to anticipate

• Lower third: Gradient establishes the 8–10% rhythm quickly — do not treat early easier pitches as an invitation to push.
• Middle section: Gradient becomes more irregular; short walls arrive with less warning.
• Upper section: The road produces its harshest ramps here. Anything approaching the 35% maximum will require your lowest gear and full seated or standing commitment.

Pacing

With an 8.68% average over nearly 12 km, the Col du Mollard is long enough that early aggression always costs you later. The recommended approach:

• Set power from the bottom. Use a target around 88–93% of your FTP for the opening kilometers. The climb is long enough that going harder early creates a compounding deficit.
• Do not accelerate into steep ramps. On a climb with a 35.19% maximum gradient, attacking the hard sections burns matches you cannot replace. Settle, drop cadence if needed, and turn the pedals through.
• Cadence flexibility matters. A smooth 75–85 rpm works well on the moderate pitches. On the wall sections, cadence will drop — accept 55–65 rpm rather than grinding a bigger gear and blowing up your legs.

Gearing

Do not underestimate this climb's gearing requirements. The 35.19% maximum gradient means:

• A compact chainset (50/34) is the floor, not a luxury.
• A cassette of 32t or larger at the rear is strongly advisable. A 34t cassette is worth fitting if you have the option.
• Riders running standard gearing (53/39) will face sections where even the lowest gear leaves them at a standstill cadence on the maximum-gradient pitches.

If you're unsure where your sustainable climbing power sits before attempting this, use the FTP estimator to benchmark yourself first.

Summary

The Col du Mollard's HC classification is not administrative padding. At 11.9 km, 8.68% average, and a maximum of 35.19%, it is a full commitment from the moment the road starts climbing at 592 m. Treat the early kilometers as investment, not opportunity. Arrive at the summit at 1,627 m with gears left to use, not ones you wished you had.