Paso Socompa

Overview

Paso Socompa is a short, high-altitude climb that trades brute steepness for thin air. Over just 5.9 km it lifts you from 3679 m to 3880 m, a net gain of 201 m, at an average gradient of 3.43%. On paper those numbers read as almost benign, and in terms of pure incline they are — the steepest pitch tops out at 6.99%, which most riders would barely register at sea level. What makes this climb its own animal is the elevation: starting above 3679 m, every pedal stroke happens in air where oxygen is scarce, and a gradient that looks like a warm-up on the profile can feel meaningfully harder in the legs and lungs. It earns a category 4 rating, the gentlest of the graded tiers below HC, 1, 2, and 3, but the altitude adds a layer the category alone doesn't capture.

How the Gradient Unfolds

The shape here is defined by moderation. With a 3.43% average and a 6.99% maximum, the difference between the typical slope and the hardest ramp is under four percentage points, so there are no walls, no lurching switchback kicks, and no sustained double-digit stretches to survive. Expect a road that undulates around its mean, with the steeper sections acting as brief accents rather than crises. The total ascent of 190 m sits just below the 201 m net gain, telling you there is very little downhill or false-flat give-back across the 5.9 km — this is an honest, steady drag upward rather than a rolling profile that hands back elevation. You climb, and you keep climbing, but never savagely.

Pacing Notes

Because the gradient is gentle, the temptation is to attack. Resist it — at this altitude, your ceiling is lower than usual, and going anaerobic early is punished slowly and thoroughly. Treat the whole 5.9 km as a tempo effort pinned just below your FTP, letting the 6.99% pinches nudge you toward threshold without tipping over. If you don't know your threshold power, dial it in first with the FTP estimator so your target watts are grounded in reality rather than optimism. With only 201 m to gain, this climb rewards a rider who holds a smooth, repeatable effort from bottom to top over one who surges and fades.

Gearing

You will not need your easiest cassette to survive the 6.99% max, but altitude changes the math on power. A compact 34-tooth chainring paired with a 34×32 low gear gives ample range for a climb this shallow, letting you spin a comfortable cadence through the steeper accents without straining. If you run a wider-range setup or simply want extra insurance against tired legs in thin air, a 34×34 offers a little more cushion for staying seated and relaxed. Either choice is comfortably up to the task across 5.9 km.

Summary

Paso Socompa is a climb where the numbers understate the experience: modest gradients, a small total gain, but real altitude. Ride it steady, gear conservatively, and let the mountain's height — not its slope — set your pace.

Length: 5.9 km
Average gradient: 3.43%
Max gradient: 6.99%
Start: 3679 m
Summit: 3880 m
Net gain: 201 m
Total ascent: 190 m
Category: 4