Alto del Tatibuco

Overview

Alto del Tatibuco is not a climb you settle into — it is a climb you survive. At just 3.4 km long, it looks almost trivial on paper, but the numbers tell a different story. An average gradient of 17.99% places it in the rarest tier of paved ascents, and the category is unambiguous: HC, hors catégorie, the hardest rating there is. Over those 3.4 km the road lifts you 616 m, from a start elevation of 1023 m to a summit of 1639 m. There is no gentle valley approach, no false flat to hide behind. From the base you are already fighting.

How the Gradient Unfolds

The defining feature here is relentlessness. When the average is 17.99% across the entire 3.4 km, there is simply nowhere to recover — every metre demands output that would be a peak effort on a normal climb. The maximum gradient reaches 26.13%, a wall steep enough that traction, balance, and raw torque all become limiting factors before your lungs even weigh in. The gap between the 17.99% average and the 26.13% max is narrow by the standards of most climbs, which means the "easy" sections are still savagely steep. Expect the road to pitch, briefly ease toward the average, then rear up again. The net elevation gain of 616 m over 3.4 km leaves no doubt: this is a sustained vertical grind, not a series of isolated ramps.

Pacing Notes

On a climb this steep, pacing is less about strategy and more about not blowing apart in the first few hundred metres. The instinct on a 26.13% ramp is to surge; resist it. Your sustainable ceiling here is anchored to your FTP, and on gradients approaching 18% you will spend long stretches above it whether you like it or not. Know that number before you start — if you are unsure, run the FTP estimator first. The smartest riders treat the whole 3.4 km as one continuous threshold effort, accepting brief overshoots on the steepest pitches and clawing back a little on anything near the 17.99% average. There is no coasting: even the shallowest section keeps you pinned.

Gearing

Do not under-gear this climb. With an average of 17.99% and pitches at 26.13%, gearing is the difference between spinning and stalling. A 34×32 is the bare minimum, and honestly most riders will want more: a 34×34 gives you the extra range to keep the cadence turning over on the worst ramps rather than grinding to a halt. If your setup allows an even easier bailout gear, use it — 616 m of climbing packed into 3.4 km punishes anyone who runs out of cassette. The goal is simple: preserve a rideable cadence so you never have to choose between weaving and walking.

Summary

Alto del Tatibuco is a pure test of steepness — short, savage, and uncompromising from 1023 m to 1639 m. Bring your lowest gear, respect the 26.13% ramps, and treat all 3.4 km as one long effort.

Length: 3.4 km
Average gradient: 17.99%
Max gradient: 26.13%
Start: 1023 m
Summit: 1639 m
Net gain: 616 m
Total ascent: 555 m
Category: HC