Alto de Terrero

Overview

Alto de Terrero is a Category 1 climb that asks for real patience. Over 15.9 km it averages 6.37%, dragging you from a base at 755 m up to a summit of 1770 m. That works out to 1015 m of net elevation gain, with 1012 m of total ascent — the two numbers sitting almost on top of each other, which tells you this is a climb that goes up and keeps going up rather than rolling with false flats and dips. At nearly 16 km long, it is the kind of effort where the clock, not the terrain, becomes your main opponent.

How the Gradient Unfolds

A 6.37% average across 15.9 km is deceptively even on paper, but the max gradient of 16.89% is the number that shapes how this climb actually feels. That ramp is more than two and a half times the average, so somewhere on the road there is a pitch steep enough to spike your heart rate and force you out of rhythm. With total ascent of 1012 m packed into the distance, the gentler stretches have to be genuinely modest to balance those steep sections out. Expect long sustained grades hovering around the average, punctuated by harder pitches climbing toward that 16.89% figure. The gap between summit (1770 m) and start (755 m) is unrelenting: there is very little relief built into the 1015 m of net gain.

Pacing Notes

On a climb this long, discipline beats bravado. Your target should sit close to threshold, so knowing your FTP is essential before you commit to a number on the first slopes. If you do not have a recent figure, run the FTP estimator first and pace off that. The trap on Alto de Terrero is the 16.89% max: riders who match the steep pitches with a big surge pay for it across the remaining kilometres. Meter your effort so the hard ramps push you a little over threshold briefly, then settle back toward your sustainable number on the 6.37% stretches. With 15.9 km to cover and 1015 m to gain, a steady, slightly conservative first third leaves you the reserves to hold form all the way to 1770 m.

Gearing

Gearing is where this climb rewards preparation. For most riders a compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will get you up the sustained 6.37% grades in reasonable comfort, but the 16.89% max is the ramp that decides your setup. If you weigh toward the heavier end, or you want to protect your legs across the full 15.9 km, step up to a 34×34 — that extra sprocket keeps your cadence alive on the steepest pitch and preserves your knees over 1012 m of climbing. Undergearing here is a false economy.

Summary

Alto de Terrero is a long, honest Category 1 climb: steady enough to reward pacing, steep enough at the top end to punish a bad plan. Bring low gears, a threshold number you trust, and the patience to spread your effort across all 15.9 km.

Length: 15.9 km
Average gradient: 6.37%
Max gradient: 16.89%
Start: 755 m
Summit: 1770 m
Net gain: 1015 m
Total ascent: 1012 m
Category: 1