Alto de Marita

Overview

Alto de Marita is a genuine hors catégorie ascent, the kind of climb that earns its HC label by sheer accumulation. Over 21.3 km it lifts you from a valley floor at 582 m to a summit at 2321 m — a net gain of 1739 m, with a total ascent of 1737 m once you account for the tiny concessions the road gives back. The average gradient is a relentless 8.18%, and the road bites hardest at a savage 33.65% pitch. This is not a climb you survive on fitness alone; it demands a plan, the right gearing, and the discipline to hold both together for well over an hour.

How the Gradient Unfolds

The headline number — 8.18% over 21.3 km — hides the real story. An average that high sustained across such distance means there is almost nowhere to truly recover. The 2 m difference between net gain (1739 m) and total ascent (1737 m) tells you how little descending happens: this road essentially only goes up. The defining feature is the 33.65% maximum. A ramp that steep is more than four times the average, so it arrives as a wall rather than a gradient. Expect long stretches near the mean punctuated by sharp accelerations in pitch that spike your effort and torch your legs if you have burned matches early.

Pacing Notes

On a climb of this length, pacing is everything. Your ceiling is your FTP — the power you can hold for roughly an hour — and Marita will take most riders longer than that to complete. Ride the sustained 8.18% sections at or just below FTP, and treat the steepest ramps toward 33.65% as short overloads to absorb, not efforts to chase. If you do not know your threshold, run the numbers through the FTP estimator before you commit to this climb. Starting too hard on the lower slopes is the classic error here; with 1739 m still to gain, a blown effort in the first third leaves you grinding the remainder in survival mode.

Gearing

Gear for the wall, not the average. On an HC climb topping out at 33.65%, standard compact gearing will not be enough for most riders. A 34×32 is the practical minimum, and even then those steepest pitches will have you barely turning the pedals. If you have any doubt about your climbing legs — or you are carrying fatigue into the day — fit a 34×34 to give yourself a genuine bailout ratio. The extra range costs almost nothing on the sustained sections and buys you the cadence to stay seated and spinning when the road rears up, rather than lurching out of the saddle at unsustainable torque.

Summary

Alto de Marita is a full-length HC test: 21.3 km of near-constant climbing at 8.18%, gaining 1739 m to a high-altitude summit, with a 33.65% ramp waiting to break anyone who paced it wrong. Bring low gears, a threshold-based plan, and patience.

Length: 21.3 km
Average gradient: 8.18%
Max gradient: 33.65%
Start: 582 m
Summit: 2321 m
Net gain: 1739 m
Total ascent: 1737 m
Category: HC