Real Christmas trees typically go on sale around the end of November or beginning of December, depending on where you live. In some areas, they may be available earlier or later, so it's best to check with local stores or online retailers for specific availability. When shopping for a real Christmas tree, look for one that is fresh and healthy, with needles that are green and pliable, and with a good scent. Also, make sure to measure your space and choose a tree that will fit comfortably.