Japan’s autumn colours region by region Every date below is a typical window, not a confirmed 2026 forecast — tenki.jp and Weathernews both list 2026 koyo data as due around September, and Japan Guide’s own 2026 reporting is expected to start around mid-September. Windows are the typical peak periods Japan Guide lists for each location (japan-guide.com/autumn-colors) — six of the 22 locations that page covers, not confirmed 2026 forecasts. Actual dates shift a little year to year, and 2026’s forecasts don’t start publishing until around September. Autumn events worth timing a trip around A handful of annual festivals are worth building…
