The best time to go to Punta de Vacas, Mendoza Province, Argentina, is typically during the warmer months, specifically from November to April.
This period offers the most favourable conditions for outdoor activities, especially for those interested in exploring the high-altitude landscapes. The weather is generally sunny and mild, making it ideal for hiking, trekking, and enjoying the natural beauty of the Andes. You'll find the mountain passes more accessible, and the chances of encountering snow on the main routes are lower.
For travellers planning to explore the iconic Aconcagua Provincial Park, these months are particularly suitable. The trails are open, and the park facilities are fully operational, allowing for day hikes or longer expeditions to viewpoints like the Laguna de Horcones. This is great for those who appreciate adventure and stunning natural scenery.
If your primary interest is skiing or snowboarding, then the winter months from June to September would be more appropriate for a visit to the nearby ski resorts.