Alto del Helecho

Overview

Alto del Helecho is a Colombian climb (CO) rated HC — the hardest category on the books. It runs 9.5 km from a start elevation of 1,169 m to a summit at 2,195 m, delivering a net elevation gain of 1,026 m. At an average gradient of 10.83%, this is a relentlessly steep road that gives you almost nowhere to hide across its length.

The number that reshapes how you ride it is the gap between net gain and total ascent. You climb 1,026 m net, but the road actually gains 1,405 m of total ascent — 379 m of extra vertical you earn back, then lose, then earn again. That means roughly 379 m of descent or false-flat is folded into the profile. The climb is not a single smooth ramp; it undulates, and every metre you drop is a metre you re-climb at brutal gradients. Plan for more work than the net figure implies.

How the Gradient Unfolds

A 10.83% average on a road that also descends means the climbing pitches are far steeper than the headline suggests. To hold a double-digit average while giving back 379 m, the uphill sections have to be savage. Expect the profile to swing between recovery and wall repeatedly rather than settle into a rhythm.

• Short descents and false-flats where you can spin, recover, and refuel
• Repeated steep pitches that reset your legs each time the road tips up
• The steepest ramps well into the teens of percent — the sections that define the effort

Pacing Notes

On a smooth climb you pace to even effort. Here, the undulation forces a choice. Chasing even speed on the descents and flats wastes matches you will need on the walls; chasing even effort means easing back before every ramp. Favour even effort. Anchor your pacing to your sustainable power output and treat the descents as free recovery, not time to attack. Let speed rise and fall — protect the number on the climbs. If you do not know your ceiling, run the FTP estimator before you commit to a target, because on a 10.83% average an over-cooked start ends the day early.

Gearing

Gearing is governed by the steep pitches, and they demand generous ratios. Fit a compact or sub-compact chainset and pair it with a wide-range cassette — think 34×32 or 34×34 as a floor, not a luxury. At these gradients you want to keep cadence up and torque down to protect your knees and your matches. Check your setup before the ride: confirm the cassette clears the derailleur and that your lowest gear actually engages. Do not discover a missing gear halfway up a wall.

Summary

• Length: 9.5 km
• Average gradient: 10.83%
• Net elevation gain: 1,026 m
• Total ascent: 1,405 m
• Category: HC

Alto del Helecho rewards riders who respect the undulation and pace to effort, not speed. Bring low gears, ride the walls conservatively, and let the descents do the recovering for you.