Rathotsava and Maharathotsava at Horanadu Annapurneshwari Temple is held in Phalguna Maasa as per Kannada calendar. In 2013, Rathotsava begins on March 12 and ends on March 16.
The five-day Car festival attracts lakhs of devotees to Sri Annapurana Shree Kshetra of Horanadu. Maharathotsava date is March 14.
The Rathotsava is observed from Shudda Padyami to Shudda Panchami.. i.e. from March 12 to March 16.
Other important festivals held in the temple are – Akshaya Thadige (Akshaya Tritiya), Shankara Jayanti, Navarathri Mahotsava, Mahachandi Homa, Deepotsava and Havi in Dhanurmasa.