Alto de Juncal

Alto de Juncal cycling climb profile

Alto de Juncal is a category 2 climb in CL, and the numbers point to a climb that is less about surviving a wall and more about managing a long, controlled effort. At 15.8 km with an average gradient of 3.88%, it is long enough to expose poor pacing, but not steep enough on paper to force a pure climbing rhythm from the bottom.

The climb starts at 1281 m and tops out at 1894 m, gaining 613 m from start to summit. That elevation change over this distance explains the character: a sustained rise with enough gradient to matter, but with a profile that should reward riders who can keep pressure on the pedals rather than repeatedly punching out of the saddle.

How the gradient rides

The average gradient of 3.88% is the key figure. It suggests Alto de Juncal is likely to feel fast for stronger riders and deceptively easy early on for anyone pacing by sensation alone. On a climb like this, the danger is not the opening effort feeling too hard. It is the opposite: the grade can encourage riding above sustainable tempo because speed remains relatively high.

The maximum gradient of 8.17% changes the pacing equation. Even if the climb is moderate overall, there are pitches sharp enough to interrupt rhythm. Those ramps are where the climb can become expensive. A rider who treats the lower-gradient sections as free speed may arrive at the steeper moments already over threshold, turning a manageable category 2 ascent into a slow fade.

The practical read is simple: this is a climb for discipline. Settle in early, keep the effort smooth, and avoid chasing every change in gradient with a surge. If riding with power, anchor the effort around a sustainable climbing range relative to /glossary/ftp, then allow only short, controlled rises on the steepest sections.

Pacing and gearing notes

Because the climb is 15.8 km, pacing should be built around duration, not just gradient. The average grade may invite a big gear, but that can load the legs too heavily over time. A slightly lighter gear and higher cadence will usually make more sense, especially before the steeper sections that reach 8.17%.

Best approach

• Start conservatively for the first part of the climb, even if the gradient feels comfortable.
• Keep torque under control on the moderate sections rather than grinding a large gear.
• Save seated climbing rhythm for the main body of the ascent, then use brief out-of-saddle efforts only to smooth over the steepest pitches.
• Treat the 8.17% maximum gradient as the limiter. Your gearing should be low enough that this pitch does not force a cadence collapse.

Alto de Juncal is not defined by a brutal average gradient. It is defined by length, elevation gain, and the way moderate climbing can quietly accumulate fatigue before the road steepens. Ride it with restraint early, and the summit comes through sustained pressure. Ride it like a short climb, and the final elevation gain will make that mistake visible.