The temple priests perform the pooja (rituals) during festivals and on a daily basis.
Like other Shiva temples of Tamil Nadu, the priests belong to the Shaivaite community, a Brahmin sub-caste.
The temple rituals are performed six times a day; Ushathkalam at 5:30 a.m., Kalasanthi at 8:00 a.m., Uchikalam at 10:00 a.m., Sayarakshai at 6:00 p.m., Irandamkalam at 8:00 p.m. and Ardha Jamam at 10:00 p.m. Each ritual comprises four steps: abhisheka (sacred bath), alangaram (decoration), neivethanam (food offering) and deepa aradanai (waving of lamps) for both Thayumanaswami and Mattuvar Kuzhal Amman.
The worship is held amidst music with nagaswaram (pipe instrument) and tavil (percussion instrument), religious instructions in the Vedas  read by priests and prostration by worshippers in front of the temple mast.
There are weekly rituals like somavaram and sukravaram, fortnightly rituals like pradosham and monthly festivals like amavasai (new moon day), kiruthigai, pournami (full moon day) and sathurthi.

The temple celebrates dozens of festivals throughout the year.
The Chittirai festival during the Tamil month of Chittirai (April - May) is celebrated for fifteen days, portraying the various incidents associated with the temple legend.
The car festival is held on the ninth day, when the processional deities of Thayumanswamy and Mattuvar Kuzhalammai are taken out in separate chariots around the temple in NSB Road, Nandikovil Street, North and East Andar streets and the Malaivasal.
The Karthigai festival is celebrated during the Tamil month of Karthikai, between November and December, concluding with the celebration of Karthikai Deepam.
 A huge lamp is lit in a cauldron, containing three tons of ghee, at the top of the Malaikottai hills during the Deepam.
To mark the occasion, the festival deity of Thayumanaswami circumambulates the mountain.

Every full moon, tens of thousands of pilgrims worship Thayumanaswami by circumambulating the Tiruchirappalli hill barefoot.
The circumambulation covers the circumference around the hill, and is referred as Girivalam.
On the day of yearly Chitra Pournami, the full moon of the Tamil calendar, hundreds of thousands of pilgrims come from across the world to worship Thayumanaswami.
The temple priests perform the pooja (rituals) during festivals and on a daily basis. Like other Shiva temples of Tamil Nadu, the priests belong to the Shaivaite community, a Brahmin sub-caste. The temple rituals are performed six times a day; Ushathkalam at 5:30 a.m., Kalasanthi at 8:00 a.m., Uchikalam at 10:00 a.m., Sayarakshai at 6:00 p.m., Irandamkalam at 8:00 p.m. and Ardha Jamam at 10:00 p.m. Each ritual comprises four steps: abhisheka (sacred bath), alangaram (decoration), neivethanam (food offering) and deepa aradanai (waving of lamps) for both Thayumanaswami and Mattuvar Kuzhal Amman. The worship is held amidst music with nagaswaram (pipe instrument) and tavil (percussion instrument), religious instructions in the Vedas  read by priests and prostration by worshippers in front of the temple mast. There are weekly rituals like somavaram and sukravaram, fortnightly rituals like pradosham and monthly festivals like amavasai (new moon day), kiruthigai, pournami (full moon day) and sathurthi.
The temple celebrates dozens of festivals throughout the year. The Chittirai festival during the Tamil month of Chittirai (April - May) is celebrated for fifteen days, portraying the various incidents associated with the temple legend. The car festival is held on the ninth day, when the processional deities of Thayumanswamy and Mattuvar Kuzhalammai are taken out in separate chariots around the temple in NSB Road, Nandikovil Street, North and East Andar streets and the Malaivasal. The Karthigai festival is celebrated during the Tamil month of Karthikai, between November and December, concluding with the celebration of Karthikai Deepam.  A huge lamp is lit in a cauldron, containing three tons of ghee, at the top of the Malaikottai hills during the Deepam. To mark the occasion, the festival deity of Thayumanaswami circumambulates the mountain.
Every full moon, tens of thousands of pilgrims worship Thayumanaswami by circumambulating the Tiruchirappalli hill barefoot. The circumambulation covers the circumference around the hill, and is referred as Girivalam. On the day of yearly Chitra Pournami, the full moon of the Tamil calendar, hundreds of thousands of pilgrims come from across the world to worship Thayumanaswami.
Thayumanaswami Temple, Rockfort