On what date is Saint Patrick's Day celebrated each year?

Saint Patrick's Day is celebrated each year on 17 March.

The date is traditionally observed as the feast day of Saint Patrick, the patron saint associated most closely with Ireland. Christian feast days commonly commemorate a saint's death or entry into eternal life, and 17 March is traditionally regarded as Patrick's death date.

The observance began as a religious feast and gradually developed into a public celebration of Irish culture, especially among Irish communities overseas. Modern events can include parades, concerts, Irish dancing, religious services and displays of green clothing.

Saint Patrick's Day is not held on a fixed weekday, so its weekday changes from year to year. When 17 March falls during Holy Week, church calendars may make special liturgical adjustments, but the civil date of the celebration remains 17 March.