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When is Yom Kippur observed?

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Circular diagram of the Jewish religious year showing Hebrew months around the outer ring and Gregorian months inside, with major holidays and fasts such as Rosh Hashanah, Yom Kippur, Sukkot, Hanukkah, Passover, and Purim labeled with their dates. — Jewish religious year The months and holidays of the Jewish religious year.

Yom Kippur is observed on the 10th day of the month of Tishri in the Jewish calendar, which corresponds to dates in September or October of the Gregorian calendar.12

As the most solemn of Jewish holidays, it marks the conclusion of the Ten Days of Repentance, a period of reflection that begins with Rosh Hashanah. The observance begins at sundown on the 9th of Tishri and continues for approximately 25 hours, during which practitioners engage in prayer, meditation, and total rest to seek reconciliation with God.31