When does the Aconcagua season open and close, and which weeks are best?
When is the Aconcagua climbing season?
Aconcagua's climbing season runs from 15 November to the end of March, when the park issues permits; the recommended window is late November to late February, and the busiest weeks are the high season from 15 December to 31 January, when the weather is at its most stable and permits cost the most.
The full answer, kept up to date: When is the Aconcagua climbing season?
And for what people actually do rather than what the calendar allows: the statistics page shows the measured summit window for each of the 7 summits, taken from the dated ascents in our finisher records. For Aconcagua, 92% of 468 dated ascents fall between December and February, and January is the busiest month by far. Expedition members can open the month-by-month chart, and the day-by-day one inside the busiest month, to see where the summit days really cluster.