Karwa Chauth is a day-long fast kept by married women for the wellbeing of their husbands, observed on the fourth tithi of the dark half of Kartik. In 2026 it falls on Thursday 29 October, about ten days before Diwali. Note that some panchang sources place it on Wednesday 28 October; the date genuinely varies by region and by which panchang a family follows.
The fast is nirjala in the strict form — no food and no water from sunrise to moonrise. It is broken only after the moon is sighted, traditionally by viewing the moon through a sieve or a strainer, then viewing the husband through the same sieve, and then drinking water from his hand. In practice, many women now take a single meal before sunrise (sargi) and drink water, which is the more medically sensible version.
The fast's origin story varies. The most common is of Veeravati, who kept the fast and, misled by her brothers into breaking it early, caused her husband's death and had to win him back from Yama. Another involves Karwa, a devoted wife whose husband was killed by a crocodile. The ritual is also tied to the wheat harvest in Punjab and Haryana, where the karwa is a clay pot filled with wheat, which is part of the puja.
The day has changed significantly. It is now widely observed in cities across India, including in the south where it was not traditionally kept, and it is a major gifting and beauty-retail occasion. Men keeping the fast for their wives, and unmarried couples keeping it, have both become more common.