What is a color map for fall foliage?

A color map for fall foliage uses colors to indicate either when peak fall foliage is reached in a certain area or what the current state of the foliage is. Fall foliage maps usually use the color spectrum between yellow and red, reflecting the colors expected of fall foliage.

On maps that indicate the approximate time when peak fall foliage is reached, yellow represents an earlier date, such as September, while red represents a later date, such as November. On maps that indicate what the current state of fall foliage is, yellow usually represents a partial change of color in the area's foliage, while the color red covers areas where peak fall foliage has occurred.