Vinicunca — Rainbow Mountain — sits about 100 km southeast of Cusco in the Vilcanota range. Iron oxide, copper and iron sulphide in sedimentary rock give the ridge its striped colours; glacial retreat around 2015 made the slopes visible from the valley below.
The hike itself is short — 3 km each way from the trailhead at 4,800 m to the viewpoint at 5,036 m — but the altitude makes it hard. Most trips depart Cusco around 3am to beat the midday clouds and finish the walk by 10am. Horses are available on the steeper sections for around 100 soles.
Acclimatise in Cusco for two or three days first. Drink more water than you expect, go slow on the climb, keep coca candy handy. The temperature swings sharply — cold at dawn, warm by 10am, cold again if cloud rolls in — so dress in layers.
Peruways runs day trips from Cusco with transport, breakfast, acclimatisation briefing and a licensed guide who can route you via Red Valley (a quieter striped ridge 20 minutes off the main viewpoint, often the better shot). Book at Peruways.
Target the dry season (May–September) when the colours are sharpest and the trail isn’t a mudslide.
