Sado Island is said to be the northernmost area of Japan that mikan are cultivated. Mikan are mainly grown in the southern part of the island, as the Tsushima Warm Current flows along the coast and they are protected from the winter monsoon (northwesterly winds) by the Kosado Hills. The average temperature is 5 degrees Celsius even in the coldest months, making the area suitable for growing mikan. Due to climate change in recent years, the slopes on the southern coast of the Kosado Hills enjoy long hours of sunlight – another favorable condition for growing mikan.

Mikan is harvested in November and December before the snow falls. The fruit is picked right as it ripens on the tree, giving it a rich and intense flavor. Sado Island mikan is characterized by its refreshing sweetness and moderately sour taste that develop by influence of the climate.