Naga Chaurthi Upvas is dedicated to Nagas or Snakes and is observed on the fourth day of the Shukla Paksha (waxing phase of moon) in the month of Shravan. In 2012, the date of Naga Chaturthi is July 22. The day after Naga Chaturthi is Naga Panchami, one of the most popular festivals dedicated to Nagas. Special pujas and rituals are held on the day.
Update: Naga Chaturthi part of Nagula Chavithi in Andhra Pradesh is on November 16.
Naga Chaturthi is of great importance in parts of
Maharashtra, Karnataka and in the Telegana region of Andhra Pradesh.
Some people fast from morning to evening and only consume a single meal on the day. Special Naga pujas are held on the day. Some Hindu communities fast during the daytime and eat food only after sunset. Some people avoid salt and deep fried on the day.
It must be noted that Naga Chaurthi is held in the Kartik month in some regions.