Autumn leaf color

Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on, during a few weeks in the autumn season, various shades of yellow, orange, red, purple, and brown.^[1] The phenomenon is commonly called autumn colours^[2] or autumn foliage^[3] in British English and fall colors,^[4] fall foliage, or simply foliage^[5] in American English.

In some areas of Canada and the United States, "leaf peeping" tourism is a major contribution to economic activity. This tourist activity occurs between the beginning of color changes and the onset of leaf fall, usually around September to November in the Northern Hemisphere and March to May in the Southern Hemisphere.