Plan de la Douve

Plan de la Douve cycling climb profile

Plan de la Douve is a Swiss category 1 climb that asks for patience before it asks for aggression. The headline numbers are straightforward: 19.7 km from a start elevation of 371 m to a summit elevation of 1507 m, with 1136 m of net elevation gain and an average gradient of 5.78%.

That average is the trap. On paper, 5.78% sounds like a climb you can settle into. In practice, the listed maximum gradient of 33.77% changes the whole pacing problem. Even if that steepest pitch is short, it means this is not a pure diesel climb where one steady power target carries you cleanly from bottom to top. The ride demands a controlled baseline effort with enough reserve to absorb extreme ramps without blowing through your limit.

How the gradient unfolds

The available profile data does not break Plan de la Douve into named ramps or intermediate sections, so the most useful reading is the relationship between length, average gradient, and maximum gradient.

Across 19.7 km, the climb gains altitude consistently enough to average 5.78%, which means the overall feel should be sustained rather than punchy. But the 33.77% maximum tells you the gradient distribution is not uniform. Somewhere on the climb, the road gets brutally steep relative to the average. That makes the effort stochastic: long enough to punish early over-pacing, steep enough to punish under-gearing.

The start at 371 m also matters. You are not beginning high in thin air, but you are still finishing at 1507 m after more than 1100 m of net gain. The physiological cost is less about altitude itself and more about duration under load. By the summit, fatigue will make even moderate gradients feel heavier if you have been riding above your sustainable ceiling.

Pacing and gearing notes

Treat Plan de la Douve as an endurance climb with a sharp tactical constraint: the steepest gradients require a bailout plan.

A smart pacing approach is to ride the opening phase below your normal climbing ceiling, especially if you are pacing by /glossary/ftp. The average gradient tempts you into settling near threshold, but the maximum gradient argues for restraint. If you arrive at the steepest pitch already carrying too much lactate, there is no easy recovery option on a climb this long.

For gearing, err on the side of too easy. The 33.77% maximum gradient is the decisive number here. A gear that feels comfortable on a steady 5.78% climb may become unusable when the road kicks up sharply. If you are choosing equipment, prioritize the lowest climbing gear available over close ratio smoothness. Momentum management matters too: stay seated when traction allows, shift before the ramp rather than during it, and avoid grinding so hard that cadence collapse forces a full-body effort.

Bottom line

Plan de la Douve is not defined by its average gradient. It is defined by the gap between that average and its maximum. Pace it like a long category 1 climb, gear it like something much steeper, and the profile becomes manageable. Misread it as a steady mid-gradient ascent, and the steepest section will decide the ride for you.