Alto de Los Toyes

Overview

Alto de Los Toyes is a genuine hors catégorie monster: 21.8 km of continuous climbing that lifts you from 1668 m at the base to 3022 m at the summit. That is a net elevation gain of 1354 m, and with the small dips and rollers factored in, a total ascent of 1381 m. The average gradient of 6.2% sounds moderate on paper, but over nearly 22 kilometres it becomes a relentless test of patience, pacing, and altitude tolerance. This is not a climb you attack — it is one you manage. The summit sits above 3000 m, so the thin air compounds the sustained effort, and the sheer length means every mistake early on is paid back with interest near the top.

How the Gradient Unfolds

The headline figure is the 6.2% average, but averages hide the story. With a maximum gradient of 12.76%, there are stretches more than twice as steep as the mean. That gap tells you the climb is uneven: expect ramps that bite well into double digits, separated by shallower sections where you can recover a little. The math is worth internalising — 21.8 km at 6.2% gives you the 1354 m net gain, while the extra 27 m of total ascent (1381 m in all) confirms a handful of brief downhill or flat interruptions. Treat the 12.76% pitches as the danger zones: they are where riders redline, blow their pacing, and unravel. Everything gentler than 6.2% is your chance to eat, drink, and reset your breathing before the next kick.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your FTP and aim to sit comfortably below threshold for the opening two-thirds — the summit is a long way off, and pushing hard early on a 21.8 km climb is the classic error. If you do not know your threshold, run the numbers through the FTP estimator before you ride so you can set realistic power or heart-rate targets. Remember that above 3000 m the thin air drags your sustainable output down, so pace by feel as much as by wattage near the top. The 12.76% ramps will tempt you to surge; resist. Meter your effort evenly and you will arrive at 3022 m with something left rather than crawling the final kilometres.

Gearing

For a 21.8 km HC climb topping out over 3000 m, gear low and gear generously. A compact 34-tooth chainring paired with a 34×32 will get most fit riders up the 6.2% average, but the 12.76% pitches at altitude are where a taller easiest gear leaves you grinding. If you have any doubt about your climbing legs — or you are riding this at the end of a long day — fit a 34×34 for extra margin. The difference between 34×32 and 34×34 is small on the flat but enormous when you are oxygen-starved on a steep ramp. Spin, do not muscle.

Summary

Alto de Los Toyes is a long, high, and unforgiving hors catégorie climb where pacing and gearing decide your day. Respect the length, save your legs for the steep ramps, and let the altitude remind you why patience wins.

Length: 21.8 km
Average gradient: 6.2%
Max gradient: 12.76%
Start: 1668 m
Summit: 3022 m
Net gain: 1354 m
Total ascent: 1381 m
Category: HC