Alto La Honda

Overview

Alto La Honda is a climb that trades on sheer duration. Over 29.7 km it lifts you from 1729 m to 3819 m, a net gain of 2090 m at an average gradient of 7.04%. That average is honest but merciless: there are no long false flats to hide behind, and the total ascent of 2077 m confirms that almost every metre gained is a metre climbed. Rated HC — hors catégorie, the hardest classification above categories 1 through 4 — it belongs in the conversation with the longest paved ascents anywhere. The thin air at the summit, nearly 3819 m above sea level, is its own opponent, thinning your power long before your legs give out.

How the Gradient Unfolds

The defining number here is consistency. A 7.04% average across 29.7 km means the road rarely relents, and with a maximum pitch of 15.88% there are ramps that more than double the mean. Do the arithmetic and the picture sharpens: 15.88% is almost 8.84 percentage points above the average, so the steep sections will feel savage against the sustained baseline your legs settle into. Expect the climb to breathe — stretches near the 7% average punctuated by harder kicks toward the mid-teens — rather than a single wall. Because net gain (2090 m) and total ascent (2077 m) sit within 13 m of each other, there is virtually no descending to recover on. What goes up here simply keeps going up.

Pacing Notes

On a climb this long, discipline beats bravado. Your target should sit at or just below your FTP for the opening two-thirds, holding wattage steady through the 7.04% grind and accepting that the 15.88% ramps will spike your effort briefly — let them, then settle back. Do not chase those spikes; over 29.7 km, repeated surges above threshold will end you long before the summit. Altitude compounds the problem: above 3000 m your sustainable power drops, so plan to ride the upper slopes below your sea-level threshold. If you are unsure of your number, run the FTP estimator before you travel and pace to that figure with a small altitude discount baked in.

Gearing

With 29.7 km at 7.04% and pitches to 15.88%, gearing is not vanity — it is survival. A compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will get most fit riders up the sustained sections, but on the 15.88% ramps at altitude you will be grinding at low cadence, and low cadence over this distance destroys legs. If your fitness or the day is anything less than perfect, size up to 34×34 for a genuine bail-out gear that lets you spin the steepest metres rather than muscle them. Given the 2090 m of climbing ahead, the extra ratio is cheap insurance.

Summary

Alto La Honda is a full-day HC test: long, unrelenting, and finished in thin air. Pace it below threshold, gear low, and respect the altitude, and the 2090 m of gain becomes an achievement rather than a defeat.

Length: 29.7 km
Average gradient: 7.04%
Max gradient: 15.88%
Start: 1729 m
Summit: 3819 m
Net gain: 2090 m
Total ascent: 2077 m
Category: HC