If you are planning to visit Nepal for trekking, then the best season to go for Nepal trek is from October to November. During this time, the visibility becomes superb; fresh air, blue sky, and cozy temperature accompany your travel. At the same time, your travel won't be affected by any landslide or clouds that may happen from June to September. Want more? Dashain, the grandest Hindu's annual festival is expected to occur in Oct in Nepal. This is the occasion where local people have tika, a red dot on their forehead which tourists can enjoy.
There are basically four seasons in Nepal and each of them has its own advantages and disadvantages. Autumn falls between September to November, Spring from March to May, Winter from December to February and Summer from June to August. Spring is considered to be the queen of all seasons and is the second most popular season for trekking in Nepal after autumn.