Alto de los Morros

Overview

Alto de los Morros is an hors catégorie monster — the hardest classification in the book, and it earns every letter of it. Over 14.3 km the road climbs from a low start of just 54 m to a summit at 1803 m, a net gain of 1749 m. That works out to an average gradient of 12.2%, a figure that reads more like a wall than a road. There is no easing into this one: the numbers alone tell you it is relentless from bottom to top.

To put the effort in perspective, the total ascent of 1704 m confirms there is almost no relief along the way. When net gain (1749 m) and total ascent (1704 m) are this close together, it means the climb barely gives anything back — you are gaining altitude on essentially every pedal stroke.

How the Gradient Unfolds

A 12.2% average over 14.3 km is the defining story here. Because net gain and total ascent sit within 45 m of each other, the profile is a near-continuous grind rather than a series of ramps split by flat recovery. Expect the gradient to hover in the double digits for long, uninterrupted stretches. Even the "gentler" sections of a climb like this rarely dip far below the average, and the steeper pitches will punch well above it.

The lack of respite is the trap. On climbs with rolling profiles you can surge and coast; here, the shape demands that you settle into one sustainable rhythm and hold it for the full 14.3 km. Every meter of the 1749 m gain has to be paid for in real time.

Pacing Notes

The single most important decision on Alto de los Morros is your opening effort. At 12.2% average for 14.3 km, going out too hard is fatal — there is no flat to recover on. Anchor your pacing to your FTP and aim to ride the lower climb at a wattage you know you can sustain for well over an hour. If you are unsure of your number, run it through the FTP estimator before you commit to a target.

Because the grade is so consistent, this is a climb where steady discipline beats bravado. Ride the first third comfortably within yourself; the sustained 12.2% will apply plenty of pressure without any help from you.

Gearing

Do not underestimate what 12.2% for 14.3 km does to your legs — bring more gear than you think you need. A compact 34-tooth chainring paired with a wide cassette is the minimum sensible setup here. A 34×32 is a starting point, but on a climb this steep and this long most riders will be far happier with 34×34 or lower. The extra sprocket buys you a higher, more sustainable cadence, which protects your knees and preserves the muscular endurance you will need to reach 1803 m. When in doubt on an HC climb, err toward the easier ratio.

Summary

Alto de los Morros is a pure test of sustained climbing: 14.3 km at a punishing 12.2% average, with almost no relief between the 54 m base and the 1803 m summit. Pace it conservatively, gear it generously, and respect the HC rating — it is not exaggerating.

Length: 14.3 km
Average gradient: 12.2%
Max gradient: n/a
Start: 54 m
Summit: 1803 m
Net gain: 1749 m
Total ascent: 1704 m
Category: HC