i'll be driving to Sounkyo in second half of oct. Is this a good time to catch the beauty of autumn leaves?The peak of the season is usually in mid October. So, you should be able to see colors in the beginning of the second half of October. But towards of the end of the months, the colors might be over.
I know that the autumn leaves would reach their peak in mid-September in Sounkyo.
Only in the high elevations of Kurodake! Not down in the valley.