In fact, it actually damages the compounds that produce the fall colors, encouraging leaf shed. Cool night time temperatures, especially in the 40's and 50's, do help with fall color. Plant in Fall Different trees contain different pigments. To be sure of fall color, you may want to choose a tree in the fall. And fall, is an ideal time to plant.
Many people erroneously think that all trees of one species turn brilliant hues in the fall.
A good example is red maples. Some native trees do turn a beautiful shade of red in the fall, others go yellow or even brown. To be guaranteed of a pretty fall tree, either buy a named variety such as 'Autumn Flame' or 'Red Sunset', or buy a pretty one in the fall. Some families of plants may be counted on for fall color more reliably than others. Dogwoods, sweetgums, black gums, sassafras, and the ornamental pears usually have brilliant shades of reds or purples.