Sandstone Red, Denim Blue, and Cactus Green. Many believe the colors of Arizona remain constant year-round, never changing from one mild southwestern season to the next. Indeed, much of the sharp, pointed high-desert flora is evergreen, but the soft riparian forests along the Verde Canyon Railroad go gold as days grow shorter and nights get cooler. In Verde Canyon the fantastic foliage, stoked by the mighty glow of fading summer, is just taking center stage in this Fall Colors Tour. Perfect warm afternoons chilled by longer nights deepen the changing hues of the forest. The fall color season lingers lazily, swaying softly like a train rolling through the wilderness.