Inca Trail Altitudes

The Inca Trail begins on a zone called "Quechua": This zone is between 2300 - 3500 m (7,500-11,500 ft) and its weather is temperate and dry with temperatures that range from 0 -21C (32 -70F). The rainy season is from December to March. The rest of the year is dry or even parched from May through September. This region is widely cultivated and essentially, there are no natural plants left.

Above Wayllabamba, there's the zone called "Suni" or "Jalca": This is the zone between 3500 - 4000 m (11,500 - 13,000 ft). There is still some agriculture possible at this altitude. Above that lies the "Puna" which is a zone from 4000 - 4800 m (13,000 - 15,750 ft). Its weather is very cold with frequent frost. It is mostly grassland with a type of grass called "Ichu" and the area is used for the Llamas and Alpacas.

Going down from the "Puna" through the "Suni" is the "Yunga Fluvial": which are inter-Andean valleys on the east of the Andes between 1000 - 2300 m (7,500 - 3,300 ft). These valleys have a moderate, moist climate and abundant vegetation.

Heights
Cusco City: 3,360 m.a.s.l.
Machu Picchu: 2,400 m.a.s.l.
Urubamba Valley: 2,850 m.a.s.l.
Inca Trail highest point: 4,200 m.a.s.l.