Japan’s most famous fall leaf is the Japanese Maple which turns brilliant red in the fall. Fall Foliage is called "kouyou" in Japanese, and the kanji, 紅葉, translates into "read leaf."
Each year, starting in late September, the "koyo front" slowly moves southwards from the northern island of Hokkaido until it reaches the lower elevations of central and southern Japan towards the end of November.
This website is really neat and you can click all over to see different pictures from different regions. I used the translate option through Google and some of it translates into English. Even though it's difficult to understand, I still enjoy looking at it and seeing the pictures. On a side note, we live on the Miura Peninsula, the small peninsula southest of Tokyo.