when do they dye the river green
They dye “the river green” in Chicago on the Saturday before St. Patrick’s Day, usually starting around 10:00 a.m. local time.
When Do They Dye the River Green?
Quick Scoop If you’re asking “when do they dye the river green,” you’re almost certainly talking about the Chicago River for St. Patrick’s Day.
The Core Details
- The Chicago River is dyed green once a year for St. Patrick’s Day celebrations.
- It typically happens on the Saturday before March 17 (St. Patrick’s Day), not on the holiday itself.
- The dyeing starts at about 10:00 a.m. Central Time and takes roughly 45–60 minutes.
- The bright emerald color lasts about 4–5 hours before it fades.
People line the riverfront downtown, especially along Wacker Drive and the bridges, to watch boats spread the dye and see the water turn vivid green in a matter of minutes.
For This Year (Example: 2026)
- In 2026, the Chicago River dyeing is scheduled for Saturday, March 14, 2026.
- Start time: around 10:00 a.m. CT , with peak color late morning to early afternoon.
A Bit of Background
- The tradition started in the early 1960s when plumbers used dye to trace sewage leaks and someone realized it would make a striking St. Patrick’s Day display.
- Today, a plumbers’ union still oversees the process, using a vegetable-based, non‑toxic powder whose exact formula is kept secret.
If You’re Planning to Go
- Arrive by 9:30 a.m. to grab a good viewing spot along the riverwalk or bridges.
- Expect big crowds, especially on a sunny or warm March weekend.
- Take your photos between late morning and early afternoon, when the green is at its brightest.
TL;DR: They dye the Chicago River green once a year , on the Saturday before St. Patrick’s Day , starting around 10 a.m. CT , and the vivid green lasts for a few hours.
Information gathered from public forums or data available on the internet and portrayed here.