Lagos de Covadonga

Overview

Lagos de Covadonga is a Category 1 climb in Spain (ES), running 13.4 km from a start elevation of 290 m to a summit at 1180 m. Over that distance you gain a net 890 m, at an average gradient of 6.66%. On paper that reads as a steady, sustained effort — a category rating and a length that put it firmly in the realm of a serious mountain day rather than a short punchy test.

But the profile is not a clean upward line. The total ascent is 1533 m, well above the 890 m of net gain. That 643 m gap is climbing you do twice — metres you gain, give back on descents or false flats, then have to earn again. For your legs and your pacing, treat this as a 1533 m climbing day, not an 890 m one. The undulation is the story here.

How the Gradient Unfolds

The 6.66% average hides how uneven this climb is. With 1533 m of total ascent packed into a route that only nets 890 m, the road repeatedly kicks up, eases, and kicks up again rather than holding one gradient. Averages flatten out exactly the ramps that hurt.

Expect the profile to break down roughly like this:

• Flatter or recovery sections where the road eases or briefly drops, giving back elevation you paid for
• Repeated short climbs stacked back to back, each forcing a fresh surge of effort
• Steeper ramps well above the 6.66% average, where the real cost of the day is concentrated

Pacing Notes

Do not chase an even speed. On an undulating climb like this, holding constant speed means spiking your power on every ramp and coasting on every dip — a fast route to blowing up. Pace to an even effort instead, anchoring to your sustainable power output and letting your speed rise and fall with the gradient.

Practically: hold a steady, repeatable effort on the steep pitches and resist the urge to hammer the recovery sections to "make up time." The 643 m of extra ascent means there is always another ramp coming. If you are unsure what number to hold, run the FTP estimator before you ride and set a ceiling you can defend for well over an hour.

Gearing

Gear for the steep ramps, not the average. On a 13.4 km Category 1 climb with pitches well beyond 6.66%, a compact or sub-compact chainset paired with a wide-range cassette is the right call — think 34×32 or 34×34 to keep your cadence up when the road pitches hardest. Under-gearing here forces you to grind at low cadence exactly where the undulation punishes you most.

Check your setup before the ride. Confirm your smallest chainring and largest sprocket, and make sure the derailleur handles the full range cleanly. Sorting gearing in the driveway is far cheaper than discovering the problem on the third ramp.

Summary

• Length: 13.4 km
• Average gradient: 6.66%
• Net elevation gain: 890 m
• Total ascent: 1533 m
• Category: 1

Lagos de Covadonga rewards riders who respect its undulation. Pace to effort, gear for the steep ramps, and treat the 1533 m of total ascent as the real workload — do that, and the summit at 1180 m comes to you.