Onam is the biggest and the most important festival of the state of Kerala. It is a harvest festival and is celebrated with joy and enthusiasm all over the state by people of all communities. According to a popular legend, the festival is celebrated to welcome King Mahabali, whose spirit is said to visit Kerala at the time of Onam.

Carnival of Onam continues for ten days in the state of Kerala. In some regions of the state festivities are restricted to four to six days only. However, scholars say, the festivities have toned down a lot in the present time. In earlier days, Onam was celebrated for a month and much more lavishly.

High-spirited people of Kerala celebrate Onam with gaiety and fervor. The festival is celebrated for a period of ten days, starting from the first day Atham and continuing till tenth and the biggest day called Thiru Onam.

The spectacular festival attracts thousands of tourists from across the country and globe. Immense popularity of the festival is further promoted by the Government of India by celebrating Kerala Tourism Week during the time of Onam.