Kati Bihu is a one-day festival in autumn in the month of Kartik. Kati literally means Kartik. Kati Bihu marks the completion of sowing of paddy and transplantation of the saplings (‘Kothia’).

Kati Bihu is a solemn affair, and there is no feasting, as the granaries are empty. The festival is hence also called Kangali Bihu, the poor Bihu.

In the evenings, offerings are made to the 'Tulsi' plant in the courtyard. Little earthen lamps ('Diyas') are lighted at the feet of the Tulsi plant. Puja's are offered to God for improved yield of crops.

The significance of this Bihu is more in the villages, where farmers go to their respective fields and light "Akash-Banti" or 'sky-lamp' hanging from a tall bamboo, to ward off pests and other insects.

After a ritual bath, people keep a day - long fast and pray to the tulasi plant. In the evening, earthen lamps are lit and placed near the basil and banana plants, granary, the backyard and the fields. Prayers are also offered at these places to protect the seedlings from any damage or danger and also for a good crop. After this ceremonial lighting of lamps, people visit each other’s homes and exchange greetings and sweets.