Puerto de Otal - Cotefablo

Overview

Puerto de Otal - Cotefablo is a Category 2 ascent that runs for 12.4 km, lifting you from 825 m at the base to 1402 m at the summit. That is a net gain of 577 m across the full length, with a total ascent figure of 560 m once the small dips along the way are accounted for. The average gradient sits at a manageable 4.65%, but the profile is not flat-tempered: a maximum pitch of 12.75% waits somewhere on the road, so this is a climb that rewards riders who can read its rhythm rather than simply grind a single number.

How the Gradient Unfolds

The headline average of 4.65% describes the whole 12.4 km, but averages hide the real story. With a peak of 12.75% recorded, the difference between the mean and the max — a swing of more than 8% — tells you the climb is uneven. Expect long stretches that sit comfortably below the average, letting you carry speed, punctuated by shorter ramps that spike well into double digits. The gap between the 577 m net gain and the 560 m total ascent is small, which confirms there is very little downhill relief here: nearly everything you climb, you keep. Treat the mellow sections as recovery and brace for the steep pitches.

Pacing Notes

Because the gradient is inconsistent, pacing by feel alone can bury you on the steep ramps. Anchor your effort to your FTP instead. On the shallower parts, sitting a touch below threshold banks energy for the 12.75% pitches, where you can afford to push briefly over threshold knowing the road eases again. If you do not know your current threshold, run the numbers through the FTP estimator before you ride so you have concrete power targets rather than guesswork. Over 12.4 km and 577 m of climbing, a steady, threshold-aware effort will always beat a hero start.

Gearing

For a 12.4 km climb averaging 4.65% with ramps to 12.75%, gearing choice is about surviving the spikes without cross-chaining your cadence into the dirt. A compact 34-tooth inner chainring paired with a 34×32 setup covers most riders comfortably on the sustained sections. If you weigh more, ride tired, or simply want to spin the steep 12.75% pitches rather than stomp them, step up to a 34×34 — the extra sprocket keeps your cadence alive when the road bites hardest. There is no penalty for having the easier gear in reserve.

Summary

Puerto de Otal - Cotefablo is a rewarding Category 2 test: 12.4 km of climbing that averages a friendly 4.65% but demands respect at its 12.75% peak. Pace to your threshold, gear for the ramps, and let the shallow stretches do the recovering. With 577 m of net elevation to conquer from base to summit, it is a climb best ridden with a plan.

Length: 12.4 km
Average gradient: 4.65%
Max gradient: 12.75%
Start: 825 m
Summit: 1402 m
Net gain: 577 m
Total ascent: 560 m
Category: 2