Chicago knows how to celebrate St. Patrick's Day like no other city, and nothing proves that more than the famous dyeing of the Chicago River. Every year people from all over the world gather to witness this dazzling transformation.

The Magic of Chicago’s Green River: A St. Patrick’s Day Must-See

In A Surprise Move, Chicago River Dyed Green Ahead Of St Patrick's Day
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If you've never experienced the river turning into a vibrant emerald green, 2025 is your year to see the magic in person.

Why Does Chicago Dye Its River Green?

In A Surprise Move, Chicago River Dyed Green Ahead Of St Patrick's Day
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That tradition dates back to 1962 when the Chicago Journeyman Plumbers Local Union discovered that a special dye used to detect pipe leaks turned the water a striking shade of green. Inspired by this unexpected discovery, the city decided to embrace it as part of the St. Patrick's Day festivities. Now, more than 60 years later, the event is one of Chicago's most beloved traditions.

Is The Green Dye Safe?

Chicago River Is Colored Green To Celebrate St. Patrick's Day
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It absolutely is! While the exact formula is a closely guarded secret, the dye is vegetable-based and environmentally friendly. The color starts off bright orange if you can believe that. It quickly transforms into the stunning shade of green that has become an iconic part of Chicago's St. Patrick's Day celebration.

When and Where to Watch the Green River Dyeing in 2025

Chicago River Is Colored Green To Celebrate St. Patrick's Day
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The Chicago River will turn green on Saturday, March 15 at 10:00 a.m. The transformation happens fast, so you'll want to be in place early to get the best view. Upper Wacker Drive between Columbus and Fairbanks is the middle of the action.

According to Secret Chicago, there are also rooftop restaurants and hotels for a birds-eye view. Be sure to click the links for information on specific viewing opportunities.

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Illinois is home to a plethora of hidden gems waiting to be explored. Parks, historic sites, roadside attractions, boutique hotels, and more. Go discover.

Gallery Credit: Steve Shannon

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