Bhutan has a season for everyone. The Kingdom stretches across all climatic zones; from the sub-tropical jungles in the south to the moderate heights of 2000 – 2500 meters in the center and up to the alpine world of the towering
Winter (December, January, February)
In Winter dry and pleasant conditions make this the best time of year for bird watching in the jungles, village to village trekking in the lower altitudes, or a bicycle trip along quiet mountain roads. The trekking routes in the high mountains are covered in deep snow and are impassable at this time of the year. The impressive and endangered Black Necked Cranes spend the winter in the high valley of Bumdeling (in eastern Bhutan) and Phobjika (in central Bhutan).
Spring. (March, April, May)
In Spring the trekking season commences in moderate altitudes. Above 3000 meters spectacular rhododendron forests bloom. In Paro, one of the largest monastic festivals, Paro tshechu, takes place. The temperature is pleasantly mild even up to the Alpine regions. Rain comes only in May as the harbinger of the approaching monsoon.
Summer (June, July, August)
Summer brings with it the monsoon, but this should not deter travelers. In the settled areas of Central and Western Bhutan, pleasant summer temperatures without heat or humidity can be found. Rain falls for short periods daily but is manageable with adequate planning and equipment. Treks in high mountain areas, e.g. the Snowman Trek, are characterized by mild temperatures, verdant green meadows, and pastures of Blue Poppies and Edelweiss. Nomads tending their yaks in the high mountains are a common sight.
Autumn (September, October, November)
Autumn is the traditional high season in Bhutan. September and October have the highest number of tshechus (monastic festivals). Trekkers particularly enjoy the clear view of the mountains in October and the low rainfall. Rice harvest means a picturesque landscape, remarkable terraces, and changing color.