Pourtalet mountain pass

Pourtalet mountain pass cycling climb profile

The Pourtalet mountain pass cycling climb is a long Category 1 effort in Spain, and the headline number is not the steepest ramp. It is the length. At 24.5 km, this is a climb that asks for discipline early, even though the average gradient of 4.77 percent can look manageable on paper.

The climb starts at 626 m and finishes at 1794 m, giving a listed net elevation gain of 1168 m. That tells you the main tactical problem: the road keeps demanding work for a long time. This is not a climb to attack like a short punchy ascent, because the cost of riding above threshold too early compounds over distance.

How the gradient rides

With a maximum gradient of 8.61 percent, Pourtalet is not defined by extreme pitches. The steepest sections are hard enough to force a change in rhythm, but the profile data points toward a climb where sustained aerobic control matters more than repeated survival efforts.

That average of 4.77 percent is deceptive in the way long mountain passes often are. A rider can feel comfortable for the opening portion because the gradient is not brutally steep, then slowly drift into trouble as the cumulative elevation gain builds. The danger is not one decisive wall. It is the quiet accumulation of torque, cadence disruption, and rising metabolic cost over more than 24 km.

The listed total ascent is 1142 m, while the net elevation gain is 1168 m. Either way, the practical reading is the same: this is a major sustained climb with well over a thousand metres of vertical change from start to summit.

Pacing strategy

Treat the first half as a setup, not an opportunity. The right opening intensity is controlled endurance to low tempo for most riders, or below /glossary/ftp if riding it as part of a longer route. If the goal is a best time, the early kilometres still need restraint, because an average gradient under 5 percent makes it easy to ride too fast without noticing the cost.

A useful pacing rule here is to cap surges on the steeper ramps rather than chase speed. When the road touches the upper end of the listed gradient range, stay seated if possible, keep pressure smooth, and avoid repeated accelerations that push you deep into anaerobic work. The climb is long enough that small overpacing errors can become the defining feature of the ride.

Gearing notes

Because the maximum gradient is 8.61 percent, most fit riders do not need emergency-level gearing, but they do need enough range to keep cadence stable late in the climb. The correct gear is the one that lets you stay aerobic on the steeper pitches without grinding. If you are close to your limit, choose lower gearing than the average gradient suggests.

Pourtalet rewards riders who respect the distance. Ride it like a long mountain pass rather than a moderate hill, keep the effort boring early, and save your best work for the final third when the elevation gain has already done its damage.