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First established in 1964, the Jigokudani Monkey Park and its famous residents have become globally famous and now attract visitors from all over the world. The troop of macaques that comes into the park is wild and free to come and go as it pleases. The story of why they are so fond of coming and the history of the park are quite fascinating and worth understanding before you visit for yourself.

Snow monkey bathing

The founding of the park is thanks to a man called Sogo Hara. An employee of the Nagano Electric Railway (Nagano Dentetsu), Hara was a keen hiker who discovered the original troop while trekking through an area known as Jigokudani, or the “Valley of Hell”, in 1957. The area was named as such due to its steep mountains and the smell of sulphur emitting from the natural hot springs that bubble to the surface in the valley. Hara marvelled at the monkeys and from that point onward became entwined in their future and story.

Young snow monkeys

At that time the monkeys faced several threats due to human encroachment into their native habitat. Of central concern was the development of ski resorts, including installation of chair lifts and cutting of trees to create ski runs, in the surrounding mountains from the early-1950s onwards. As ski resorts were development, Hara observed a dramatic decrease in the number of monkeys who had no choice but to migrate to the lower mountain regions, including Jigokudani, and into areas of human habitation in Yamanouchi.

Snow Monkeys_180521_0227

As the monkeys appeared more frequently in villages, they began raiding crops from farms, to the understandable dislike of local farmers. Before long the community reacted with farmers hunting down the monkeys, raising the ire of Soga Hara, and driving his efforts to ensure the protection of his beloved monkeys. By this time the monkeys had also discovered something for themselves – a traditional guesthouse called Korakukan and its appealing ‘onsen’ (natural hot spring). As the only guesthouse in the Jigokudani area, Korakukan had long been known for the restorative powers of its waters. Through watching humans soaking in the hot spring, the macaques soon copied the behavior themselves and thus became the only monkeys in the world known to enjoy bathing in onsens. Soon after, Tomio Yamada first photographed this unique behaviour and thus the legend of the bathing snow monkeys of Jigokudani was born!

Snow monkeys bathingSnow monkeys bathing

While sight of bathing monkeys immediately proved popular with visitors, there were serious ramifications for the guesthouse, not least the hygiene of their water of (human) guests. With all of these issues in mind, Soga Hara led the movement to establish the monkey park – somewhere his cherished monkeys would be safe. Baths were created in the park just for the monkeys, using the local hot spring source. Fencing was considered to keep the monkeys away from human villages however ultimately rejected due to cost and a wish to not deny the freedom of the monkeys. Thus the daily practice of feeding the monkeys began, to incentivize them to remain in the park rather than head to the villages below where they were considered to be pests. This process of trial and error eventually revealed their preferred food – raw barley and soybeans (3 times per day) with apples for snacks during the green season. This practice continues to this day.

Snow monkeys bathing

It is important to note that the monkeys remain wild and still need to fend for themselves. The rangers are careful not to overfeed them or make them reliant of barley, soybean, and apples they provide. The food is an incentive to come but not enough to survive on. Around ten years ago, the park experimented with allowing visitors to feed the monkeys however it was quickly discovered that this made the relationship between monkeys and visitors more tense and aggressive, taking away from the enjoyment of observing the monkeys in their near-natural state. Visitors to the park are no longer allowed to feed the monkeys and over generations, the resident troop has become very accustomed to human company allowing for a unique experience and close proximity observation of these fascinating creatures.


While extremely popular with visitors from all over the world, the park remains first and foremost, a place of conservation and within the natural territory of the troop. It is an important place for scientific observation and study and we ask that you always follow the park rules when visiting the Jigokudani Snow Monkey Park.