If the statute does not involve a suspect or quasi-suspect classification, then rational basis review applies, in which a court must ask whether the statute is rationally-related to a legitimate governmental interest.
Autumn Foliage Color. The Process of Leaf Color Change. Leaves change color during the autumn because the amounts of pigments change as the leaves prepare to fall from the trees. All leaves gradually lose chlorophyll during the growing season, and this loss accelerates before leaf fall.
The color we see when we look at leaves comes from cells called pigments. The green color we see every spring comes from the pigment called chlorophyll. Throughout the summer the pigments that give us fall colors such as orange, yellow, and brown are produced in the leaves, but they are hidden by the green chlorophyll.