Japanese macaques live on three of Japan’s four main islands: Honshu, Shikoku, and Kyushu. They are absent from Hokkaido, the northernmost main island, but inhabit several smaller islands off the coasts of the other three. Their range stretches from subtropical forests in the south to snow-covered mountains in the north, making them the most cold-tolerant non-human primates on Earth.
Native Range Across Japan’s Islands
The core of Japanese macaque territory spans Honshu (the largest island), Shikoku, and Kyushu, plus a handful of smaller coastal islands. The farthest-north population lives on the Shimokita Peninsula at the northern tip of Honshu, in Aomori Prefecture. This is the northernmost habitat of any wild primate species in the world. Winters there bring heavy snowfall and freezing temperatures, yet the macaques persist year-round.
At the opposite end, the southernmost population lives on Yakushima Island, off the southern coast of Kyushu. These macaques are distinct enough to be classified as their own subspecies. On Yakushima, the monkeys depend heavily on natural broadleaf forests, and troop density is highest along the western coast where undisturbed natural vegetation remains intact. The island spans about 127 square kilometers of coastal habitat where censuses have tracked the population.
Forest Types and Elevation
Japanese macaques are habitat generalists. They occupy deciduous broadleaf forests, evergreen forests, coniferous forests, mixed forests, grasslands, and even planted timber forests. The specific forest type varies by region and elevation. In mountainous areas they move through beech forests and mixed zones of hornbeam and fir. At lower elevations, they use evergreen forest and pine stands. They also forage in grasslands and frequent plantations of Japanese cedar, a commercially planted tree species common throughout the islands.
Elevation varies dramatically across their range. In the Northern Japan Alps, researchers tracked troops living at average elevations between 740 and 1,458 meters. On smaller islands like Kinkazan, where the highest peak reaches just 445 meters, macaques shift their altitude use with the seasons. In spring and summer they concentrate at elevations below 200 meters. In fall and winter they spread out more widely, using sites from the seashore up to about 300 meters. This seasonal movement follows food availability and shelter needs.
The average troop in the Northern Alps occupies a home range of about 3.7 square kilometers, with an average group size of around 48 individuals. Troops living deeper in natural forests tend to inhabit higher elevations and rely more on deciduous broadleaf trees. Troops closer to human settlements shift their habits, spending more time in pine forests and on cultivated land, particularly from summer through winter when crops are available.
The Snow Monkeys of Jigokudani
The most famous Japanese macaque population lives in the Jigokudani Valley in Nagano Prefecture, central Honshu. “Jigokudani” translates to “Hell Valley,” named for the steam rising from volcanic hot springs in the steep, forested gorge. At about 850 meters elevation, winter temperatures here drop to minus 10 degrees Celsius and heavy snow blankets the ground for months.
The macaques in this valley are known worldwide for bathing in natural hot springs, a behavior that helps them cope with the extreme cold. This population has become a major tourist attraction, drawing visitors who hike into the valley to watch the monkeys soak in steaming pools surrounded by snow. The behavior is genuinely functional: the warm water helps regulate body temperature during the harshest months.
Expanding Into Human Areas
Japanese macaques are increasingly showing up in places they weren’t seen a generation ago. As forested mountain habitat meets expanding suburban and agricultural zones, troops have pushed into farmland, villages, and even cities. Shiga Prefecture, in central Japan near Lake Biwa, is a focal point for these conflicts because urban development, agriculture, and forest all converge in a relatively small area.
The problems are concrete and widespread. Macaques raid crops, dig up flower bulbs, and damage gardens. Residents of Konan village in Shiga Prefecture describe groups of 30 to 50 monkeys descending on their land. Similar intrusions and crop destruction are reported in villages across Japan, from Yakushima Island in the far south to communities in Nagano and Gunma Prefectures. Longtime residents note a clear behavioral shift over decades. Observers report that macaques now appear in the middle of major cities including Tokyo, Kyoto, and Osaka, something that was essentially unheard of in previous generations.
This expansion doesn’t mean the macaques have abandoned their forest habitat. Rather, troops near the forest edge have learned to exploit agricultural food sources, blurring the boundary between wild and human-occupied landscapes. Rural troops spend significantly more time on cultivated land from summer through winter compared to spring, timing their visits to crop cycles.