The best time to visit Argentina depends on the area you are visiting. For Buenos Aires, the ideal times are during their spring and autumn. Mendoza and the Lake District are also spectacular in autumn, when the leaves on the trees turn red and brown. Additionally, in March, Mendoza holds the Queens Carousel Parade to celebrate harvest season – including lots of wine tasting.
For Patagonia, the best time to go is during the summer months (winter in the UK), as many services are unavailable in the winter.