Sakat Chauth falls on Maagh Krishn Chauth.

There lived a potter in a certain city. Once he made his clay pots and put them in the oven but the oven didn't start and his pots didn't get cooked. He did it several times but in vain, so he went to the King and told his saga. The King called his Raaj Pandit and asked the reason for this. Pandit said if the potter will sacrifice a baby every time he starts his oven then only the oven will start. Te King had ordered for this and the sacrifice of children started. Whichever family had its turn, that family sent its one child for the sacrifice.

After a while an old woman's turn came. She had an only son. He was her whole sole. She thought, "I have only one child and he will also be separated from me on the day of Sakat Chauth. She thought for some time and gave him Sakat Supaaree (betel nut) and a betel leaf and said - "Take Bhagavaan's name and sit in the oven, Sakat Maataa will protect you. The child sat in the oven in the potter's home, and the old woman started worshipping Sakat Maataa in her home. Previously the oven took several days to cook pots but this time it cooked in one day only. When the potter came to see it in the morning, he got very surprised - the oven has cooked the pots and child was safe in the oven. By the grace of Sakat Maataa other children also came alive.

As Sakat Maataa protected that old woman's son, in the same way she should protect everybody's children.

Sankat Chauth Kathaa
The legend or story or Vrat Kathaa of Sankashti Ganesh Chaturthee is associated with King Shoorsen, Lord Indra and sage Brushundi. The legend or Kathaa goes like this:

Once Lord Indra's Vimaan (airplane) was returning home from sage Brushundi's (a great devotee of Lord Ganesh) Aashram, and was going above king Shoorsen's kingdom. One person who had committed many sins in his life saw that plane in the sky. With his single look the plane fell on the ground. Surprised by the brightness of the plane, the King went to see the plane. The King was very much pleased to see Lord Inra and saluted him. He asked Indra the reason for landing the plane there. Indra told him that a sinner from your kingdom looked at the plane, and due to his sins the plane had fallen on the ground. King Shoorsen asked Indra how the plane could be started again.

Indra told him that today is Panchamee, yesterday was the Chaturthee. A person, who has fasted yesterday, gives his virtue to me then only my plane will start. Soldiers searched the whole kingdom for the person who did fasting on Chaturthee. But unfortunately no one was there. At the same moment some soldiers saw a recently dead woman being taken away by Ganesh's Doot (Lord Ganesh's messenger). They asked him that how can you take such a sinner woman to Ganesh Lok. Ganesh Doot replied that yesterday the whole day she was in sleep and had not eaten anything. She woke up late night after moon-rise and ate some food. Without knowing it she did Sankashti Chaturthee Upavaas. She died today.

The soldier also said that a person, who does Sankashti Chaturthee Vrat at least once in life-time, goes to Ganesh Lok or Swaanand Lok after death. Soldiers requested Ganesh Doot to give that woman's body to them so that Indra's plane could start, but he refused to give the body of that woman to soldiers. The wind which blew from the dead woman's body diffused at the place where the plane of Lord Indra was stopped. The air which was coming touching that dead virtuous woman's body also got virtuous because of touching that virtuous woma's body so with the touch of that virtuous air Indra' plane started. This was the effect of Sankat Chaturthee Vrat.