Saint Patrick’s Day 2026: Why Do We Wear Green on March 17th?

Published by Caroline de Sortiraparis, Laurent de Sortiraparis · Photos by Caroline de Sortiraparis · Updated on February 10, 2026 at 10:56 p.m.
Every March 17th, the Irish don their green attire to celebrate St. Patrick’s Day in style. But do you know why this particular color has become so closely tied to the festivities? Here’s the story.

The Saint Patrick's Day is undoubtedly the most significant celebration for many Irish people. In fact, it’s a public holiday in Ireland. But this event is also celebrated around the world, including in France. Observed every March 17th, it’s a perfect opportunity to gather with friends, enjoy the festivities, sip some beer (responsibly!), and dress up... in green, perhaps as a leprechaun, and don your lucky Irish shamrock (shamrock)!

But why is it essential to wear green on Saint Patrick's Day? Originally, the color worn by the Irish on this day wasn't green, but... blue. In fact, in 1783, an Anglo-Irish chivalric order named after Saint Patrick chose blue as its flag color. Historically, Irish flags were also blue.

However, over the years, the celebration of Saint Patrick has shifted from its religious roots to focus more on cultural identity and Irish nationalism, even if the name of Saint Patrick remains. So, how did we go from blue to green?

To truly understand this shift, we need to go back to the late 18th century. In 1798, Ireland was still under British rule, which was challenged by the Society of United Irishmen, whose flag was green. This color, in particular, led to those who bore it being persecuted by the English. However, in 1921, following the end of British occupation, Ireland naturally chose to adopt green as a symbol of the nation.

Some tales also suggest that the color green refers to Ireland’s nickname, "The Emerald Isle", thanks to its lush, verdant landscapes. Today, while blue still holds a special place in Irish culture, green has become the unmistakable symbol of St. Patrick’s Day, proudly worn year after year on March 17th.

In fact, green was the color of the day every March 17 in cities all over the world, and not just in Ireland. The city of Chicago, for example, didn't hesitate to pour green dye into its river in honor of the holiday. In Paris, monuments such as the Sacré-Coeur and the Moulin Rouge have already gone green.

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Practical information

Dates and Opening Time
Starts March 17, 2026

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