Spud lovers can now rejoice because National Potato Day is Saturday, Aug. 19. Potatoes have been a popular food item for centuries, which were originally cultivated by Inca Indians in Peru around 8,000 B.C. to 5,000 B.C., according to PotatoGoodness.com. When Spanish Conquistadors defeated Peru in 1536, they discovered the potato and brought its flavors to Europe.