Hanuman Jayanthi in Tamil Nadu is celebrated in Margazhi Month. In 2017, Hanuman Jayanti date in Tamil Nadu is December 18.
It is celebrated with utmost fervor in Suchindram Anjaneyar Kovil (Suvarchala Sahitha Hanuman Temple) near Kanyakumari, three famous Anjaneyar Temples at Mylapore in Chennai and Prasanna Yoga Anjaneyar Temple located near Madras Institute of Technology in Chromepet in Chennai.
In Tamil Nadu, Hanumath Jayanti is observed on Moolam Nakshatram in Margazhi Month. Most of the times, Moolam Nakshatram falls during Margazhi Amavasai as per Tamil calendar.
In Mahrashtra and other places of North India, Hanuman Jayanti is celebrated on Purnima in Chaitra Month (March – April) and in some places of Andhra Pradesh it is also celebrated in Vaishakh Month (April – May).