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when do they dye the chicago river

They dye the Chicago River green each year on the Saturday on or before St. Patrick’s Day, usually starting around 10:00 a.m. local time.

When Do They Dye the Chicago River?

Quick Scoop

  • The Chicago River is dyed green for St. Patrick’s Day celebrations every March.
  • The dyeing happens on the Saturday on or before March 17 (St. Patrick’s Day).
  • The boats usually start releasing dye around 10:00 a.m. Central Time , and the process takes about 45–60 minutes.
  • The bright green color is most vivid from late morning to early afternoon and typically fades after about four to five hours.

In 2026, for example, the river dyeing is scheduled for Saturday, March 14, 2026 , beginning around 10:00 a.m.

How It Usually Works

  • Crews from the Journeymen Plumbers Local Union 130 handle the dyeing each year.
  • They use roughly 40–60 pounds of a plant-based, environmentally friendly dye, sometimes nicknamed “leprechaun dust.”
  • Boats travel a central stretch of the river downtown (between Columbus Drive and State Street) to spread the dye.

The tradition dates back to the early 1960s and has become one of Chicago’s most recognizable St. Patrick’s Day rituals.

If You’re Planning to Go

  • Aim to be along the riverfront by 9:30–10:00 a.m. to watch the color change.
  • Popular viewing spots include Upper Wacker Drive near Columbus and Fairbanks, and bridges in the downtown Loop.
  • Expect big crowds; many people head straight to the downtown St. Patrick’s Day parade afterward.

Mini FAQ

Q: Is it always the same day?

  • It’s almost always the Saturday before St. Patrick’s Day, or the Saturday that falls on March 17 itself if the holiday is on a Saturday.

Q: How long does it stay green?

  • The river is brightly green for roughly 4–5 hours before it fades back toward its normal color.

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