Alto de La Laguna

Overview

Alto de La Laguna is a hors catégorie climb that earns its rating on every axis: length, gradient, and sheer altitude. Over 26.1 km the road grinds upward at an average of 6.89%, gaining a net 1802 m of elevation with 1784 m of total ascent. It begins at 2041 m — already thin air by most standards — and finishes at 3843 m, a summit high enough that oxygen alone becomes a limiting factor long before your legs give out. This is not a climb you attack; it is a climb you survive, then respect.

How the Gradient Unfolds

The 6.89% average is a useful headline, but averages flatten the story. With a maximum pitch of 11.14%, the difference between the steepest ramps and the mean tells you the road is not uniform — expect stretches noticeably shallower than 6.89% that let you recover, punctuated by walls approaching that 11.14% ceiling. Because the climb runs a full 26.1 km, those harder sections arrive across a very long timeline, so a spike that feels manageable at kilometre 5 can feel brutal past kilometre 20, especially as elevation climbs toward 3843 m. Treat every steep pitch late in the climb as costing more than the gradient number suggests.

Pacing Notes

Discipline is everything here. The gap between total ascent (1784 m) and net gain (1802 m) is small, meaning almost every metre you climb stays climbed — there is little downhill respite to bail you out of a bad pace. Anchor your effort to a sustainable percentage of your FTP rather than to how you feel in the first few kilometres, because 26.1 km at 6.89% will punish anyone who starts hot. As you push past 3000 m toward the 3843 m summit, sustainable power drops with the thinning air, so plan to hold something back for the final third. If you don't know your threshold, run your numbers through the FTP estimator before you commit to a target — guessing on a climb this long is how days unravel.

Gearing

Come geared to spin. On an HC ascent averaging 6.89% and touching 11.14% across 26.1 km, cadence preservation matters far more than any pride in a big cog. A compact 34-tooth chainring paired with a 34×32 low is the sensible baseline for strong climbers, but given the length and the 3843 m altitude sapping your output, most riders will be grateful for a 34×34. If your frame and derailleur can clear even more range, take it — nobody has ever regretted an easier gear 20 km into an HC climb. The goal is to keep the pedals turning smoothly on the steepest ramps without grinding into your reserves.

Summary

Alto de La Laguna is a genuine bucket-list HC climb: long, steep in places, and defined above all by the 1802 m of net vertical that carries you into rarefied air at 3843 m. Respect the distance, pace to your threshold, gear generously, and it becomes one of the most rewarding summits you can earn under your own power.

Length: 26.1 km
Average gradient: 6.89%
Max gradient: 11.14%
Start: 2041 m
Summit: 3843 m
Net gain: 1802 m
Total ascent: 1784 m
Category: HC