From USA Today:
You can’t take a boat ride into the roar and spray of Niagara Falls in the winter, but this time of year offers a different spectacle: Nighttime illumination of the falls in a changing array of colors – red, white, blue, purple, orange, amber and green.
In spring and summer, the colored lights shine for just three hours, but with less daylight in winter, curtains of color wash over the falls each night for up to seven hours.
Crowds gather along the sidewalk and railing on Niagara Parkway to see the show as mist rises from the falls and basin in front of them; others watch from the windows of hotels and restaurants on the Canadian side.