Alto de Patio Bolos

Overview

Alto de Patio Bolos is a genuine hors catégorie (HC) monster — the kind of ascent that reshapes an entire day around it. Over 39 km of continuous climbing, the road lifts you from a start elevation of 1450 m all the way to a 3473 m summit. That is a net elevation gain of 2023 m, with a total ascent of 2114 m once the small dips and false flats are counted. The average gradient reads a modest-sounding 5.19%, but do not let that number fool you: on a climb this long, a 5.19% average hides long stretches that sit well above it, plus a punishing max gradient of 15.6%.

How the Gradient Unfolds

The headline figure is duration. At 39 km, this is a climb measured in hours, not minutes. The 5.19% average is the story of the whole road, but the 91 m gap between the 2023 m net gain and the 2114 m total ascent tells you the profile is not perfectly smooth — there are brief respites and small descents that steal back altitude you will have to reclaim. The teeth of the climb live in the ramps toward that 15.6% maximum. Those pitches are where riders who spent their matches early in the 39 km come undone. Because you finish at 3473 m, the final third also delivers thinning air, which quietly flattens your ceiling even where the road eases.

Pacing Notes

On a climb of 2023 m of net gain, discipline beats bravado. Anchor your effort to your FTP and ride the first two-thirds noticeably below threshold — the 39 km will not forgive an early overreach. Treat the sections near the 15.6% max as surge-and-settle moments: accept a short spike in power, then return to your steady climbing effort rather than trying to hold the surge. If you do not know your threshold number, run your recent data through the FTP estimator before you plan a target for this ascent. Remember that near the 3473 m summit, altitude blunts the power you produce at any given heart rate, so your final-hour numbers should be planned lower than your sea-level equivalents.

Gearing

Gear for the long haul and the steep ramps, not the 5.19% average. A compact 34-tooth inner chainring is the sensible foundation here. Pair it with at least a 34×32 low gear to keep a survivable cadence over the bulk of the 39 km. For the 15.6% pitches — especially arriving fatigued and oxygen-starved above 3000 m on the way to 3473 m — a 34×34 gives you the extra spin that saves your knees and your legs. On a climb gaining 2023 m, the wider ratio is insurance, not indulgence.

Summary

Alto de Patio Bolos rewards patience, a light gear, and respect for its 39 km of climbing to a 3473 m summit. Pace it honestly, save something for the 15.6% ramps, and let the numbers guide you.

Length: 39 km
Average gradient: 5.19%
Max gradient: 15.6%
Start: 1450 m
Summit: 3473 m
Net gain: 2023 m
Total ascent: 2114 m
Category: HC