Bahula chauth is celebrated mainly in Gujrat by farming community in the auspicious month of Shravana before the Nag Panchami festival. It is observed on the fourth day of waxing phase of moon in Shravana. It is famously known as Bol Choth in Gujrat.
It is celebrated as the mark of respect to the cattle for their important role in farming. It is also celebrated in Madhya Pradesh as Bahula chauth.
There was a cow called Bahula, who was on her way to home to feed her calf but suddenly encountered a hungry lion who wanted to eat her. Bahula told the lion that she was on her way to feed her hungry calf but she promised the lion to return after feeding her calf. The lion agreed to let her go and she also kept her promise by returning to the lion. The lion was so touched by her loyalty and let her to go back to her calf.