Sindoor Tritiya, Sindhur Teej, Sindhara Teej, Sowbhagya Teej, Gauri Teej, is observed on the third day of Navratri Durga Puja festival.
In 2017, Sindoor Tritiya date is September 23 in Maha Navratri (Shardiya Navratri) and March 30 in Chaitra Vasantha Navaratri.
Sindoor Teej is mainly celebrated in North Indian states like Rajasthan, Gujarat, Maharashtra, etc..
As it falls on third day of Navratri, Chandraghanta Navdurga is worshipped. The main ritual of Sindoor Tritiya is – offering Sindoor (Kumkum / Vermillion powder) to the Goddess.
Suvasini Puja is also observed on Maha Tritiya day in many parts of India where Suvasini (Sumangali) women are assumed as Goddesses and worshipped.