St. Patrick’s Day 2025: History, traditions, and why the world goes green

Every year on 17 March, cities across the world turn green as people celebrate St. Patrick’s Day. What started as a religious feast in Ireland has evolved into a massive cultural event. Parades, music, and Irish-themed festivities fill streets in New York, Chicago, Dublin, and beyond. But how did this day, honouring Ireland’s patron saint, become an international phenomenon?

Who Was St. Patrick?

Despite being the most famous Irish saint, St. Patrick was not Irish. Born in Roman Britain in the late fourth century, he was kidnapped by raiders at 16 and taken to Ireland as a slave. After years in captivity, he escaped, trained as a priest, and made a surprising choice—he returned to Ireland to spread Christianity. His efforts left a lasting mark, and centuries later, the Catholic Church recognised him as a saint. The date of his death, 17 March, became his feast day, eventually turning into a national holiday in Ireland.

How the U.S. Shaped St. Patrick’s Day

Records show that St. Patrick’s Day was celebrated in America before the country even existed. Irish immigrants held early observances in cities like Boston and New York, with the first recorded parade in New York taking place in 1762.


For many Irish-Americans, the holiday became a way to express pride in their heritage, particularly in the face of discrimination. Over time, what began as a solemn religious occasion in Ireland transformed in the U.S. into a lively public celebration. Ironically, the grand parades and festivities in America later influenced Ireland, which adopted a more celebratory approach to the day.

A Symbol of Identity and Unity

Beyond the parades and green attire, St. Patrick’s Day holds deeper significance. For Irish immigrants, it was a declaration of belonging, a response to nativist prejudice in the 19th century. Today, the holiday is more than an Irish tradition—it’s a worldwide celebration of culture, resilience, and community.

From Dubai to Australia, St. Patrick’s Day is now marked in cities across the globe, proving that its message of unity and cultural pride transcends borders. Even political leaders use the occasion to strengthen diplomatic ties, with Ireland’s Prime Minister traditionally visiting the U.S. to reinforce economic and cultural connections.

Why Green? And Other Traditions

Originally, blue was associated with St. Patrick, but over time, green became the dominant colour due to its link with Ireland. The shamrock, a symbol of the holiday, is said to have been used by Patrick to explain the concept of the Holy Trinity.

Another popular legend claims St. Patrick banished snakes from Ireland. While scholars view this as symbolic of his role in converting Ireland to Christianity, it remains one of the most enduring myths linked to the saint.

A Global Irish Festival

With more people of Irish descent living outside Ireland than in the country itself, St. Patrick’s Day has become a global festival. Whether in New York’s Fifth Avenue parade, Chicago’s tradition of dyeing its river green, or celebrations in Singapore and Sydney, the holiday unites millions in a shared appreciation of Irish culture.

The phrase “Everybody’s Irish on St. Patrick’s Day” might not be entirely literal, but it captures the inclusive spirit of the holiday. What began as a religious tribute to a saint has transformed into a worldwide celebration of heritage and identity, bringing people together year after year.