Kouilal Pass

Kouilal Pass cycling climb profile

Kouilal Pass is a long, aerobic Category 1 climb rather than a short, violent effort. The headline number is 34.5 km at 3.74%, but that average needs to be read carefully. A climb of this length with a maximum gradient of 8.38% is not simply a steady drag from bottom to top. It gives you enough moderate terrain to settle into rhythm, but also enough steeper ground to make early overpacing expensive.

The climb starts at 277 m and tops out at 1,567 m, with 1,290 m of net elevation gain. That vertical difference is the real story. Even though the average gradient sits below what many riders would consider a sustained high-mountain grind, the duration of the ascent means it should be treated as an endurance climb first and a strength climb second.

How the gradient shapes the ride

At 3.74% average over 34.5 km, Kouilal Pass rewards patience. The lower overall gradient means speed can stay relatively high compared with steeper climbs, which often tempts riders into riding by momentum rather than effort. That is the trap. The climb is long enough that a small overshoot early can compound into a much larger cost near the top.

The 8.38% maximum gradient changes the pacing equation. It suggests there are pitches where the climb briefly moves from tempo climbing into a more forceful, seated grind. Those sections are unlikely to define the whole climb, but they can define your ride if you arrive at them already above threshold. The smart approach is to keep the easier gradients genuinely controlled, then absorb the steeper ramps without needing a major surge.

The listed total ascent is 1,285 m, very close to the net elevation gain, which points to a climb that is primarily one-way upward rather than a rolling ascent with repeated descents. That makes pacing simpler: assume the road keeps asking for steady work, and avoid treating any easier section as free terrain.

Pacing and gearing notes

Ride Kouilal Pass from the bottom as a controlled endurance effort. If using power, anchor the first part below /glossary/ftp rather than chasing speed. The average gradient can make the climb feel deceptively manageable, but the length means glycogen cost and muscular fatigue will accumulate steadily.

Gearing should be chosen for the maximum gradient, not the average. A setup that feels efficient at 3.74% may feel overgeared when the road reaches its steepest pitches. You want at least one easier gear available for the ramps, so cadence does not collapse and force repeated torque-heavy efforts.

Practical approach:

• Start easier than the gradient makes you think you need to.
• Keep pressure smooth through the moderate sections instead of surging.
• Save your harder seated efforts for the steepest ramps.
• If riding by feel, avoid breathing that feels urgent until the final portion of the climb.

Kouilal Pass is not defined by a brutal average gradient. It is defined by length, accumulated elevation gain, and the need to manage changes in pitch across a long Category 1 ascent. Ride it like a long climb from the first kilometre, not like a false flat that happens to point uphill.