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About St. Patrick's Day

St. Patrick's Day commemorates Saint Patrick, the patron saint credited with bringing Christianity to Ireland, and traditionally marks the date of his death. Because the day originated as a religious feast day on the Christian liturgical calendar, its date is fixed at March 17 every year rather than calculated from a lunar or seasonal cycle. For centuries it was observed in Ireland primarily as a modest religious holiday, with churches and quiet family observance rather than the large public celebrations associated with the day today. Its transformation into a major public festival with parades, music, and greenery is largely credited to Irish immigrant communities abroad, particularly in the United States, where large-scale parades in cities became a way for immigrant populations to publicly express identity and solidarity. These diaspora celebrations then influenced how the holiday came to be marked back in Ireland itself in more recent decades. Today the day is recognized well beyond Ireland, with parades, green-themed events, and public celebrations held in cities across North America, the United Kingdom, Australia, and elsewhere, often drawing participation from people with no Irish ancestry at all. Wearing green, associated with Ireland's landscape and the shamrock, is one of the day's most recognizable customs, and the shamrock itself is tied to a legend that Patrick used its three leaves to explain a religious concept. A common misconception is that the holiday has always centered on parties and public parades; in Ireland, pubs were in fact required by law to close on March 17 for much of the 20th century, since the day fell during the Christian season of Lent. That closure requirement was only lifted in the 1970s, after which the day's public, celebratory character expanded considerably.

Dates on this page are checked against public calendar sources. Spot something wrong? Let us know.