When does the autumn foliage actually peak in Japan?

The autumn foliage season in Japan, known as koyo, is one of the most beautiful things the country produces. It is also one of the most misunderstood by visitors who assume it happens everywhere at the same time. The peak moves south and downhill through October and November, which means timing your trip to a specific region makes a significant difference to what you actually see.

How the koyo season moves ¶

The colour change begins in Hokkaido in late September and moves gradually southward and downward in elevation through October and into November. By mid-October, the mountains of Nikko and the highlands around Karuizawa are typically at or near peak. The Ina Valley in Nagano, which sits at a slightly lower elevation, tends to peak a week or two later.

The Japan Meteorological Corporation publishes a koyo forecast each year, usually from late August, which gives regional peak dates. These are estimates rather than guarantees. A warm September can push the peak later by a week, and an early cold snap can accelerate it. We check the forecast regularly from September onwards and adjust private departure dates when we can.

Nikko in October ¶

Nikko, in Tochigi Prefecture, is one of the most reliably spectacular koyo destinations in the Kanto region. The cedar-lined avenues around the Toshogu shrine complex turn a deep amber, and the lake at Chuzenji reflects the surrounding hills. The peak is usually in the second or third week of October.

The town itself gets busy on weekends during peak season, which is why our itinerary builds in a weekday visit to the main sites and keeps the weekend for quieter walks around the lake. The difference in crowd levels between a Tuesday and a Saturday in Nikko in October is considerable.

Karuizawa and the Ina Valley ¶

Karuizawa is a highland resort town in Nagano Prefecture, about an hour from Tokyo by shinkansen. In autumn, the birch forests around the town turn yellow and the air is noticeably cooler than the lowlands. It is a good place to spend two nights without a heavy agenda. The Shiraito Falls are a short taxi ride away and the town has several good coffee shops that are not crowded in the mornings.

The Ina Valley, further south in Nagano, is less visited than Karuizawa and more rewarding for it. The valley floor is lined with rice fields that have usually just been harvested by mid-October, and the mountains on both sides are in full colour. The Komagatake Ropeway, which rises to 2,612 metres, gives a view of the colour change from above. On a clear day, you can see the colour gradient moving down the slope in real time.

Timing the koyo season well takes a bit of planning and some flexibility. If you can tell us your preferred travel window, we can advise on which region is likely to be at its best and adjust the itinerary accordingly.