Puerto de la Fuente de la Cueva

Overview

Puerto de la Fuente de la Cueva is a Category 1 climb in Spain (ES), running 16.2 km from a start elevation of 923 m to a summit at 1,845 m. Over that distance it delivers a net elevation gain of 922 m at an average gradient of 5.68%, placing it firmly in the long, sustained bracket rather than a short wall.

The number that shapes the experience, though, is the gap between net gain and total ascent. You gain 922 m net, but you climb 1,343 m in total — a 421 m difference that gets given back as descents and false flats along the way. That undulation means the real climbing sections are steeper than the 5.68% average implies, because roughly a third again as much vertical work is buried in rollers you don't see in the net figure. Budget for more effort than a simple 922 m over 16.2 km would suggest.

How the Gradient Unfolds

The 5.68% average is a blend, not a constant. With 1,343 m of total ascent packed around only 922 m of net gain, the road rises, gives some back, and rises again — so the pitches that actually count sit well above average. The steepest ramp reaches 21.01%, a gradient that demands you be in the right gear before you hit it, not scrambling once you're on it.

• Flatter and recovery sections where the road levels or dips, contributing to the 421 m of descent hidden in the profile
• Repeated short climbs stacked between those recoveries, each steeper than the 5.68% average
• A maximum ramp of 21.01% — the single hardest pitch, and the one that dictates your gearing

Pacing Notes

On an undulating climb like this, chase even effort, not even speed. Holding a steady sustainable power output means you'll slow on the 21.01% ramps and roll faster across the recovery dips — and that's correct. Riders who instead try to hold constant speed spike their power on every steep pitch and arrive at the summit cooked.

Set a target power you can hold for the full 16.2 km before you start. If you don't know that number, run the FTP estimator first and pace to a percentage of it. Use the flatter and descending sections to recover, not to attack.

Gearing

The 21.01% maximum gradient governs your setup. That is steep enough that a standard chainset will have you grinding or forced out of the saddle at the worst moment. Fit a compact (50/34) or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 low gear gives you a cadence you can actually turn on the steepest ramp. Check your chainrings and cassette before the ride; the summit at 1,845 m is not where you want to discover you're over-geared.

Summary

• Length: 16.2 km
• Average gradient: 5.68%
• Maximum gradient: 21.01%
• Net elevation gain: 922 m
• Total ascent: 1,343 m
• Category: 1

Puerto de la Fuente de la Cueva rewards riders who respect its undulation: pace to power, gear for the 21.01% ramp, and treat the 421 m of hidden descent as recovery rather than lost ground.