When Do They Dye The River Green In Chicago 2025. According to officials, the river dyeing this year will take place at 10 a.m. Crews are scheduled to begin dumping dye into the river at 10am on saturday, march 16.
To find out which buildings were sending waste into the river, city crews began putting a special green dye into the sewage system to trace the origin of discharged. Thousands of residents turn up to watch the chicago river.