Koyo (紅葉) — the Japanese term for autumn leaf turning — is one of Japan’s most celebrated seasonal phenomena, rivaling cherry blossom season in the intensity of public engagement. The color change begins in Hokkaido in late September and moves southward through Honshu, reaching Kyushu and the Ryukyu Islands by mid-November. Japan’s dense deciduous forests, mountain valleys, and carefully designed temple gardens provide some of the world’s most dramatic foliage displays.
Peak Koyo by Region and Timing
Hokkaido: Daisetsuzan National Park sees peak color late September–early October; Sounkyo Gorge and Asahidake ropeway are the most accessible high-altitude spots. Tohoku: Towada-Hachimantai National Park, Naruko Gorge (Miyagi), and the beech forests of the Shirakami Sanchi World Heritage site peak mid-October. Nikko, Tochigi: The cedar avenues and shrine precincts frame maple and ginkgo turning mid-October; the Irohazaka switchback road is famous for its tunnel of red maples. Kyoto: Temple gardens — Eikan-do, Tofuku-ji, Arashiyama — peak late November. Tofuku-ji’s Tsutenkyo bridge over a valley of 2,000 maples is one of Japan’s most photographed koyo views. Osaka/Nara: Minoo Park waterfall and Yoshino mountain follow Kyoto by 1–2 weeks.
Temple and Garden Koyo
Japan’s formal gardens are designed for koyo viewing. Shinjuku Gyoen (Tokyo) combines French formal, English landscape, and Japanese garden sections with maples, zelkova, and ginkgo peaking late November. Korankei Gorge (Aichi) is a 4-kilometer maple corridor with 4,000 trees, illuminated at night through November. Haguro-san (Yamagata) offers cryptomeria-lined pilgrimage paths against maple hillsides.
Koyo Forecast and Planning
Japan Meteorological Corporation and Weather News publish annual koyo forecasts from early September, tracking the color change front (koyo-zensen) southward. Peak color typically lasts 1–2 weeks at any given location. The mitsuba tsutsuji azalea and iroha kaede maple are the primary color contributors; ginkgo (yellow) peaks 1–2 weeks later than maples in most areas.
Practical Tips
Kyoto in peak koyo (mid–late November) rivals cherry blossom season for crowds and accommodation scarcity — book 3–4 months ahead. Temple evening illumination events (momiji-kari by lanternlight) sell out quickly. Weekday visits to popular spots like Tofuku-ji reduce crowd density significantly. The JR Pass covers trains to most koyo destinations; local buses in mountain areas require separate IC card payment.