Alto del Sol Latorre Mejillones climb profile
Alto del Sol Latorre Mejillones is a category 2 climb in Chile that rises from 3 m to 579 m. On paper, the core demand is clear: 9.3 km of climbing at an average gradient of 6.22%, gaining 576 m from bottom to summit.
That makes it long enough to punish early overpacing, but not so long that it becomes a pure diesel effort where the gradient can be ignored. The key detail is the gap between the average gradient and the maximum gradient of 13.45%. A 6.22% average suggests a climb that can be ridden rhythmically, but the maximum tells you there are sharper sections capable of forcing a real torque response if you arrive under-geared or already too deep.
How the gradient rides
The start is almost at sea level, at 3 m, and the summit sits at 579 m. With 576 m of net elevation gain and 579 m of total ascent, this is not a profile defined by meaningful downhill interruptions. The road is effectively asking you to climb almost continuously from bottom to top.
That matters tactically. On a climb with repeated descents or long flat shelves, you can afford to surge, recover, and reset. Here, the near match between net gain and total ascent points toward a more persistent uphill load. Even if the road eases in places, the overall character is sustained climbing rather than stop-start climbing.
The 13.45% maximum gradient is the section that should shape the ride before you ever reach it. Since the average is 6.22%, the steepest ramps are well above the baseline demand of the climb. If you ride the early kilometers as if the whole climb will sit neatly at the average, those steeper pitches can turn a controlled effort into a scramble.
Pacing notes
Treat the lower part as the place to build pressure, not prove form. A sensible approach is to sit just below your sustainable climbing effort early, then let the gradient dictate small changes rather than attacking every rise. If you track effort by /glossary/ftp, this is the type of climb where going over threshold too often on the steeper pitches can cost more than it gains.
The most efficient ride is likely one where you protect cadence and keep the power spikes short. The climb is long enough that repeated anaerobic responses will accumulate, but short enough that a controlled negative split is realistic if the first half is disciplined.
Gearing notes
Bring a climbing gear you can actually use when the road reaches its steepest pitch. The average gradient does not demand extreme gearing by itself, but the 13.45% maximum does. If your easiest gear only feels comfortable on steady mid-gradient roads, it may force low-cadence grinding on the hardest ramps here.
The practical goal is simple: stay seated when possible, keep traction and rhythm, and avoid turning the steepest sections into maximal muscular efforts. Alto del Sol Latorre Mejillones rewards the rider who respects the average without forgetting the maximum.