I visited GUNMA prefecture, a mountain area 2 hours distance from Tokyo, on Oct. 25&26, 2014. We can see spectacular view in this season, especially from the end of October until the beginning of November. It's actually my favorite season in Japan and I strongly recommend you to visit Japan in this season.
Now, I'm gonna show you how it is...
"RED LEAVES" When the lowest temperature in a day gets below 7℃, the color of leaves turn into red or yellow. And, as temperature gets lower and lower, they finally fall down to the ground.