Assam's Bihu festival is a celebration for marking the begining of the agricultural season. There are three Bihu festivals in Assam – in the months of Bohaag (Baisakh, the middle of April), Maagh (the middle of January), and Kaati (Kartik, the middle of October).
Each Bihu coincides with a distinctive phase in the farming calendar. The most important and colourful of the three Bihu festival is the Spring festival "Bohag Bihu" or Rongali Bihu celebrated in the middle of April. This is also the beginning of the agricultural season.
Bihu is celebrated in all parts of Assam and by people belonging to all castes and religions. Bihu is a secular festival which brings in humanity, peace and brotherhood among the people of various tribes, castes and religions of the region.