There are four seasons in Nepal as under and each season has its own distinct attraction to offer.

Autumn:
September through November. This season offers excellent weather and tantalizing mountain views.

Winter:
 December through February. This season is noted for occasional snowfall only at higher elevations. Hence, it is ideal for trekking at lower elevation, generally below 3000m.

Spring:
 March through May. Different varieties of wild flowers, especially Rhododendrons make the hillside above 5000m a haunting paradise during the season. It is mildly warm at lower elevations and at higher elevation over 4000m, the mountain views are excellent and temperature is quite moderate.

Monsoon:
 June through August. Summer months continues up to mid September making travel wet and warm. This time is a blessing for the keen botanist as the higher valleys and meadows blossom with flowers and lush vegetation. It is recommended to carry insect repellents when trekking during summer months. Trekking into the rain shadow region, behind the high mountains and tour to Tibet will be a wonderful experience.