Collado de Prat de Estaso

Overview

Collado de Prat de Estaso is a Category 1 climb in Spain, covering 9.1 km from a road that starts at 824 m and tops out at 1,573 m. The net elevation gain is 749 m, which places it firmly among the serious mountain efforts you plan a ride around rather than tack on at the end. At 8.21% average over that distance, it never lets you settle into an easy rhythm.

The total ascent of 995 m sits well above the 749 m net gain, a gap of roughly 246 m. That difference is undulation: the road repeatedly gives back height that you then have to reclaim. In practice you climb 995 m of vertical to net only 749 m, so the effort is heavier than the summit-minus-start figure suggests. Every metre of descent mid-climb is a metre you pay for twice.

How the Gradient Unfolds

The 8.21% average is a blend, not a constant. With a maximum gradient of 24.13%, at least one ramp is more than double the average, and the undulation baked into the total ascent means the flatter and downhill segments are pulling that average down. Where the road eases, the steep pitches must be far harsher to compensate.

• Short flatter or recovery sections that briefly drop below average and give the average its downward pull
• Repeated short climbs stacked back to back, the source of the 246 m of extra ascent
• A single brutal ramp at up to 24.13%, where you shift to your lowest gear and simply survive

Pacing Notes

On a smooth climb you can hold even effort and let speed vary. Here the undulation makes even-speed pacing a trap: matching your flat-section pace on the 24.13% ramp would blow you apart. Anchor your ride to even effort instead. Know your sustainable power output and hold it steady, letting speed collapse on the steep pitches and rise on the recovery sections. Do not chase the dips back up. If you are unsure of your ceiling, run the numbers through the FTP estimator before you commit to a target for the full 9.1 km.

Gearing

A 24.13% ramp dictates your setup, not the 8.21% average. Bring a compact or sub-compact chainset paired with a wide-range cassette — think 34×32 or 34×34 — so you have a bailout gear low enough to keep turning through the steepest section without stalling or wrenching your knees. Check your chainset and cassette before the ride; discovering you are over-geared on a 24% wall is not a mistake you can fix mid-climb.

Summary

• Length: 9.1 km
• Average gradient: 8.21%
• Maximum gradient: 24.13%
• Net elevation gain: 749 m
• Total ascent: 995 m
• Category: 1

Collado de Prat de Estaso rewards riders who respect the gap between its net gain and its total ascent. Pace to effort, gear for the steepest ramp, and treat the recovery sections as recovery — not as time to attack.