Every cruise line sells an “autumn colors” sailing. Almost none of them tell you the one thing that decides whether you see any: the foliage front moves 2,000 km in eight weeks, and your itinerary either meets it or misses it.
Japan happens to have the world’s best data on exactly this. The Japan Meteorological Agency has logged the first day the maples turn (かえで紅葉日) at official specimen trees in each city for decades. We pulled the official 1991–2020 normals from JMA’s own data files and mapped them to the cruise ports. Here is when the colors actually arrive.
The foliage front, port by port
Dates are JMA 30-year normals for maple turning red at each city’s official observation tree (ginkgo gold, where noted, runs earlier). Ports are in the order the front reaches them:
How to read this as a booking calendar
Mid-October: only the far north has turned — a Kushiro or Hokkaido call is your color. Late October to mid-November: the golden window for the autumn northern run — Hakodate, Aomori, Akita and Niigata turn in sequence, almost port by port as a southbound ship would meet them. Mid-November to early December: the classic Pacific circuit finally colors up — Hiroshima, Kanazawa, Tokyo, then Kansai. December: the season’s secret — Nagasaki, Yokohama and Kagoshima maples peak when most people think foliage is over, which is exactly when the last sailings of the year are cheapest.
Two bonuses ride with the late-autumn window, both from our own data work: it carries the year’s best Mt. Fuji visibility odds for your Shimizu day, and a fraction of the typhoon risk of the same itinerary in September.
The honest caveats
- The specimen tree is in the city. JMA observes one official tree per station, usually at the observatory — famous foliage valleys and temple gardens nearby often peak one to two weeks earlier than the city normal. Treat these dates as “color has reached this port’s altitude,” not “the postcard spot peaks today.”
- Recent years run late. The observation records show a clear drift past the 1991–2020 normals — Kyoto’s maples turned Dec 13 in 2023 and Dec 20 in 2024 against a Dec 5 normal. If you are choosing between two sailings, the later one has quietly become the safer foliage bet.
- North of the maple line. In eastern and northern Hokkaido the official maple species doesn’t grow; JMA observes substitute trees there (we’ve used them for Kushiro and the Sapporo area, as JMA does).
- What the data covers. Since 2021 JMA’s plant observations track six species — including ginkgo and maple, the two that matter for autumn. Everything here comes from the agency’s official normals files, not commercial forecasts.
Whichever week you pick, the port-day arithmetic stays ours to solve: find your port, check what fits your hours, and be back aboard sixty minutes early — with red leaves in your camera roll.
