One of the city’s favorite traditions is the dyeing of the Chicago River in honor of St. Patrick’s Day. The dyeing always occurs the Saturday before the holiday (except when March 17 falls on a Saturday) and this year, it’ll take place on March 15. The event draws thousands of spectators, who gather to watch the water turn green. Whether you’re a first-timer or someone who makes the annual pilgrimage downtown to join in on the fun, here’s everything you need to know about the Chicago River dyeing.
What time does Chicago dye the river green in 2025?
Crews are scheduled to start the river dyeing process at 10am on Saturday, March 15.
How do they dye the river green?
Using several boats, the Chicago Journeymen Plumbers Local Union 130 pours and spreads 40 pounds of vegetable-based dye into the river—from Columbus Drive to Orleans Street—until it’s a bright shade of green.
How long does the dye last in the river?
Depending on the wind, the river usually stays green for a day or two.
Where are the best places to watch the dying of the Chicago River?
You’ll be able to see the dyeing anywhere along the Chicago River from Columbus Drive to Orleans Street. The Chicago Riverwalk and Wacker Drive are popular stretches for watching the action, as are the bridges that cross over the river. Many hotels, restaurants and bars overlooking the water will also host viewing parties, including RPM Seafood, Pizzeria Portofino, The Royal Sonesta, Miru, LondonHouse, Travelle at The Langham and Raised.