One can visit anytime to Bhutan. Bhutan have four seasons Spring (March, April and May), summer (June, July and August), autumn (September, October and November) and winter (December, January and February). Its year round destination however peak season for visitors are during Spring time and autumn time as weather is perfectly fine as its neither cold nor hot during these times of the year and also it is during these times many festivals are held which amazes visitors with its beautiful colors with unique mask dances and cultural dances with lot of people coming to attend with their best attires and also these seasons are best if you want to do trekking. We suggest you to do during spring time as you will be greeted with beautiful colored rhododendron flowers and others.