On October 22, the Frog and Toad Migration Moon comes into its final quarter. The following day, called Cross-Quarter Day, the sun reaches half way between autumn equinox and winter solstice, entering the fertile but chilly sign of Scorpio. Today is the hinge of middle autumn and initiates the most dramatic period of leaf fall. After the September tier of wildflowers and the October witch hazels end their seasons, the floral year comes to a close throughout the northern half of the United States