Hanukkah, one of the most widely observed Jewish holidays, is a joyous eight-day winter festival. It begins on the 25th day of Kislev, the ninth month of the Hebrew calendar. This usually falls between late November and late December. In 2024, Hanukkah celebrations will start at sundown on December 25, coinciding with Christmas Day, and conclude on January 2, 2025. This overlap of the two holidays last occurred in 2005 and will not happen again until 2035.