When Does Advent Start 2025. Advent 2025 begins on sunday, november 30th, starting the celebration season for the birth of jesus christ with the advent season ending on the first mass of christmas(vigil mass) on christmas eve. This places the start of advent between november 27th and december 3rd, depending on the specific calendar year.
Andrew the apostle (30 november) and embracing four sundays. that means that the first sunday of advent can fall as early as november 27 or as late as december 3. In most years, advent is a little shorter, depending on which weekday december 25 (christmas!) happens to be that year.
