Bands of yellow and orange aspen trees ripple across the slopes, flickering against the dark green of conifer forests. The display is dazzling, but leaves don’t change color just for decoration. The ...

The physical signs of fall begin when the leaves change color and start to fall from the trees. This transformation is triggered by shorter daylight hours and cooler temperatures. The process of ...

Warmer nights can delay the changing colors of leaves or turn down their vibrance, scientists say. Heat and drought are bad combinations for trees, putting stress that could mute autumn colors. One ...