Thrissur is best known for its mammoth Pooram Festival, which is the most colourful and spectacular temple festival of Kerala. Thrissur Pooram, attracts large masses of devotees and spectators form all parts of the State and even outside.The legends and myths behind each festival of Kerala are many, varied and equally interesting. Since the word pooram literally means a group or a meeting, it was believed that every year the dynastic gods and goddesses of neighbouring province met together for a day of celebration. This usually happened on the pooram asterism of one of the spring months.

The gods and their entourage arrived for the meeting on colourfully decorated tuskers. Even today, the converging of these divine processions at the festival venue is an awe inspiring sight. The pooram draws to a close with mind-blowing fireworks displays in the evening and in the wee hours of the next morning.

Celebrated Malayalam month of Medom (April-May) in every year.it consists of processions of richly caparisoned elephants from various neigbouring temples to the Vadakunnatha temple, Thrissur. The most impressions are those from the Krishna temple at Thiruvambadi and the Devi temple at Paramekkavu. Pooram is an assemblage of suburban deities before the presiding deity at the Siva temple in down town Thrissur. The Pooram celebration is held at the Thekkinkadu grounds.

Thrissurpooram was introduced by Sakthan Thampuran (1775- 1790), , the Maharaja of erstwhile Kochi state. The Pooram festival is also well-known for the magnificent display of fireworks. It is celebrated by two rival groups representing the two divisions of Thrissur Paramekkavu and Thiruvambadi vying with each other in making the display of fireworks grander and more colourful. Each group is allowed to display a maximum of fifteen elephants and all efforts are made by each party to secure the best elephants in South India and the most artistic parasols, several kind which are raised on the elephants during the display. The commissioning of elephants and parasols is done in the utmost secrecy by each party to excel the other. Commencing in the early hours of the morning, the celebrations last till the break of dawn, the next day.

Of the rival groups participating in the Pooram, the most important ones are those from Pramekkavu and Thiruvambadi. At the close of the Pooram both these groups enter the temple through the western gate and come out through the southern gate to array themselves, face to face, one from the round and other form the Municipal Office road. This spectacle is highly enchanting. Although this grand festival is known as Thrissur Pooram, it is in fact the conclusion of the eight -day Utsavam of nine temples.The procession of the Thiruvambadi Pooram to the grounds of Vadakkunnatha Temple and back is not only important, but also quite enlivening. The marvelous as well as magical effect of the Panchavadyam, a combination of five percussion and wind instruments, is to be felt and enjoyed.