Seasonality is one of the most important factors in the tourism industry in Nepal. Economically, it can have many negative influences as a destination, but at the same time it may give a time for improvement of services provided by host community as well as it may recover to the service providers from the stress of the peak season. This paper highlights the pattern of seasonal variation of tourist arrival in Nepal at different time on the monthly and quarterly basis. It is found that the seasonal variation is the maximum in autumn () and minimum in summer (). Similarly it is the maximum in October () and minimum in June ().This paper also tries to present annual increase of number of tourists that is 37,089 in number per year. This study expects that the findings of this paper may help planners and decision makers for formulating tourism policies and programs of the nation.