Create a welcoming feel and natural oasis in your yard with shade trees. Not only do they provide a cool spot on a sunny day, they can help you save on energy bills. Shade trees have attractive foliage that often turns colorful in the fall. Some of the most popular shade trees are oaks, maples, redbuds, poplars and many nut trees. The two most important factors when selecting the best shade trees to buy are their grow zone and mature height and spread. While some shade trees can grow more than 75 ft. tall, others are suitable for smaller spaces. If you want shade in a hurry, select fast-growing shade trees.