Puerto de Foncebadón

Overview

Puerto de Foncebadón is a Category 2 climb in Spain (ES), running 10.3 km from a start elevation of 952 m to a summit at 1,495 m. The net elevation gain is 543 m, and the average gradient across the ascent works out to 5.28%. On paper that reads like a steady, mid-tier effort — long enough to matter, shallow enough to ride within yourself.

The paper number is misleading. Total ascent is 724 m against a net gain of only 543 m, a gap of 181 m. That difference is undulation: the road gives back elevation you have already earned, then makes you climb it again. You will do roughly a third more vertical work than the net figure suggests, and every metre lost on a dip is a metre you re-climb without credit toward the summit. Plan for the 724, not the 543.

How the Gradient Unfolds

A 5.28% average on an undulating profile is a blend, not a description of any single section. The descents and flat stretches drag the mean down, which means the climbing pitches are steeper than 5.28% wherever the road actually goes up. Do not use the average to set your effort — use it to remind yourself the hard bits are hiding.

• Flatter and recovery sections where the gradient eases or briefly tips downhill — soft-pedal these, but keep momentum.
• Repeated short climbs that account for the 181 m of extra ascent over the net gain.
• A steepest ramp reaching well into double-digit gradients — the sharpest single test on the climb.

Pacing Notes

On a climb this lumpy, even-effort beats even-speed. Chasing a constant speed forces you to spike hard over every rise and coast the descents, burning matches you cannot get back. Instead, hold a steady sustainable power output and let your speed rise and fall with the road — fast on the flats, slower on the ramps.

Set your target as a percentage of threshold and keep it capped through the steep pitches rather than surging to hold pace. If you do not know your number, run the FTP estimator first and anchor the whole 10.3 km to it.

Gearing

The steepest ramp dictates your gearing, not the average. Even though 5.28% is comfortable, a double-digit pitch late in a 10.3 km effort will wreck a road-standard setup. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you a spinning gear to protect your legs on the sharp sections and over the repeated rises.

Check your chainset and cassette before you leave. Confirming the low gear exists at the trailhead is far better than discovering it does not halfway up the steepest ramp.

Summary

• Length: 10.3 km
• Average gradient: 5.28%
• Net elevation gain: 543 m
• Total ascent: 724 m
• Category: 2

Puerto de Foncebadón rewards riders who respect the gap between its gentle average and its real profile. Ride to power, gear for the steep ramps, and budget for the full 724 m of climbing — do that, and the 543 m net gain to the 1,495 m summit will feel earned rather than punishing.