The study was conducted in the Govt Duck and Poultry farm, Joysagar, Sivasagar district of Assam with the objective to know the hatchability percentage of Pati duck. The nos. of eggs set in the incubator and the no. of eggs hatched was used to determine the hatchability percentage. Artificial incubation was used for hatching the eggs. Eggs were collected from progressive farmers near Sibsagar district of Assam who reared the pati duck in backyard system. Eggs were collected in different seasons i.e. spring (February to April), summer (June to August), autumn (September to November) and winter (December to February). The study revealed that hatching percentage was highest in spring season and lowest in summer season. Therefore, it can be summarized that there may be seasonal effect on hatchability of Pati Duck eggs.