In the olden times people from other parts of Kerala and Tamil Nadu migrated to Idukki and so Idukki district is said to have a mixed culture. A large tribal population is settled in Idukki and there are more than 200 tribal clans here. The main inhabitants of this place are the scheduled tribes which include Malayarayan, Mannan, Oorali, Paliyan, Malapandaram, Malayan etc. Out of all the tribes Malayarayan excel in socio economic and educational aspects.
An important festival of this place is the Adimali Fest which is both a tourism and agricultural festival that is prevalent since 1991. Agricultural fairs are conducted as part of this festival and are conducted annually during the last week of December.