When Is Advent 2025. Advent as a religious period actually begins on the fourth sunday before. This year, advent will begin on sunday, december 1st, and end on tuesday, december 24th.
Other important days in the catholic church for 2025 december 1, 2024| first sunday of advent (beginning of a new liturgical year) december 30, 2024 | feast of jesus, mary, and joseph Ordinary time (after pentecost) (green) begins the day after pentecost and ends the day before advent.