This festival has been observed since the time of the ninth king of Bhot Uday Gungyal. The festival is also termed as Gyalbo Lhosar, according to researcher Tika Sherpa.
On this occasion, people of the Sherpa community clean up their houses and villages, sources of water and flutter new prayer flags on the roof of their houses. They cook delicacies such as Guthuk and Khapse and exchange best wishes with each other to welcome the New Year. The Gurung community marks its New Year on Paush 15 as the Tamu Lhosar while the Tamang community observes it as Sonam Lhosar on the day of Magh Shukla Pratipada.