Sadeh Festival is the Festival of Defeating Evil
January 10th is the end of forty days of harsh winter; it is the end of forty days which is known as "Chelle Bozorg" (the major 40s). At the end of Chelle Bozorga hundred days passed from the great ancient winter. The day after is the beginning of "Chelle Kochak" (the minor 40s). In contrast to Chelle Bozorg. Chelle Kochak is not forty days, actually, it's twenty days. In these twenty days, the winter is going to show its last strength, to resist and withstand against spring, and at last the spring
powerfully overcome and defeat winter.

This day is called Sadeh because it is the day of celebrating the genesis of fire, celebrating the victory of light over darkness, and celebrating overcoming evil Sadeh Festival begins on the eve of January 30th. It's The greatest festival of fire and a very old festival from ancient Persia. During this festival, people from old Persia were standing at the top of mountains and roofs of houses and set the fire there and standing by the fire and based on their local language and culture, sang different chants and melodies, and wished for the cold to leave and the warmth to come. In addition, in some areas, people did social games and shows. Some have suggested that this appellation is due to a hundred days before obtaining the agricultural products.

Mehrdad Bahar in his book "A Research on Iranian Culture" claims that the word "Sadah'in Avesta language means to rise and arise and it has no relation to the number 100. According to historians such as Biruni and Beihaghi, the Sadeh festival is one of the three greatest Iranian festivals in the Islamic era, which was lasted up until the late Khwarezmid era (1231-1077) and Mongols attack, and it was celebrated by Kings, prices and even ordinary people. The most famous and the greatest Sadeh Festival was celebrated by Mardavij (934) in Isfahan. Over the past eighty years, the Sadeh Festival was celebrated in the city of Kerman; and every year the most magnificent Sadeh Festival is celebrated by Kerman's people. Ruh Al-Amini, a citizen of Kerman, claims that Kermanian Celebrate this Festival more magnificently than other regions of the country. It is still a custom in Kerman that the farmers throw the ashes of the fire on their farms because they believe that the ashes of Sadeh fire prosper the land".