Walnut, sumac, pomegranate, madder and oak are plants widely used in natural dying. In order to measure fastness degree of wool dyed with these plants, dying were made by using mordant of alum. So, plant organs crushed at the weight of 25%, 50%, 100% and 200% of wool weight were used. Dark colors were determined at all samples with which plant two times of wool weight were used. However, as dye concentration increased, rubbing and washing fastness in wools decreased; whereas wet water dropping fastness increased. Dry water dropping fastness obtained from all concentration were found to be high (4-5).