Mount Tengu is one of the most distinctive peaks of the Yatsugatake Mountains in Chino, Nagano Prefecture. With its rugged ridgelines, alpine scenery, and rewarding hiking routes, it attracts mountain lovers throughout the year.
The mountain consists of two summits: West Tengu Peak at 2,645.8 meters and East Tengu Peak at 2,640 meters. Together, they form the highest mountain area in the northern section of Yatsugatake and are also included among Japan’s 200 Famous Mountains.
The Yatsugatake range is broadly divided into Southern Yatsugatake and Northern Yatsugatake, with Natsuzawa Pass marking the boundary. Although Mount Tengu belongs to Northern Yatsugatake, its steep rocky ridges give it a rugged character more commonly associated with the southern peaks.
Northern Yatsugatake is generally known for gentle mountain slopes, dense coniferous forests, and scattered lakes and ponds. Mount Tengu is a striking exception, with exposed rocks and steep ridges that create a dramatic alpine landscape.
From the summit, hikers can enjoy expansive views of the Yatsugatake Mountains, as well as the Southern Alps, Central Alps, and Northern Alps in the distance. On clear days, the panoramic scenery is one of the greatest rewards of climbing the mountain.
The summit area is divided into two peaks. West Tengu Peak rises to 2,645.8 meters, while East Tengu Peak reaches 2,640 meters. The main traverse route through Yatsugatake passes over East Tengu, making it a popular destination for hikers exploring the mountain range.
Several trails lead toward Mount Tengu, allowing hikers to experience different landscapes along the way. The principal trailheads include Shibu-no-Yu on the western side, Karasawa Kosen, and Inagoyu on the eastern side.
Shibu-no-Yu, located in the Okutateshina hot spring area, is one of the most commonly used starting points for climbing Mount Tengu. The trail passes through Kuroyuri-daira, a scenic highland area where Kuroyuri Hutte provides accommodation and a place for hikers to rest.
Kuroyuri-daira has an open alpine atmosphere that contrasts beautifully with the surrounding forests. It is an excellent place to experience the distinctive landscape of the Yatsugatake mountains before continuing toward the summit.
From Kuroyuri-daira, two trails lead toward the summit. The western route passes through an area known as Tengu-no-Niwa, or “Tengu’s Garden.” This unusual landscape is scattered with strange rock formations, low coniferous trees, and small ponds.
The combination of rocks, alpine vegetation, and mountain pools gives the area the appearance of a natural garden. The otherworldly scenery makes this section one of the memorable parts of the hike.
Another popular approach begins at Karasawa Kosen. On the eastern side, hikers can approach Mount Tengu via Inagoyu and Honzawa Onsen. Each route offers its own combination of forests, mountain streams, rocky terrain, and expansive views.
Kuroyuri Hutte, located at Kuroyuri-daira, is a welcoming base for hikers. Visitors can stay overnight or stop for meals and a rest while enjoying the surrounding mountain scenery.
Spending a night in a mountain hut provides a different way to experience Yatsugatake, with the changing light of the mountains, quiet forests, and star-filled skies creating a memorable atmosphere.
Honzawa Onsen is one of the most remarkable hot springs in the Mount Tengu area. Located at an elevation of approximately 2,150 meters, it is famous as Japan’s highest-elevation hot spring inn that operates throughout the year.
The inn was founded in 1882 and has long served hikers and mountaineers seeking to recover from the rigors of the trail. Its remote mountain setting is part of the appeal.
The highlight is Unjo-no-Yu, an outdoor hot spring bath situated about a 10-minute walk from the inn. The bath is surrounded by spectacular mountain scenery, creating the feeling of soaking directly in the wilderness.
This is a particularly rustic bathing experience: the outdoor bath has no changing room or privacy screen, so visitors should be prepared for a very natural and open-air experience.
The spring water is classified as an acidic sulfur-bearing calcium-magnesium sulfate spring. The indoor and outdoor baths use different types of spring water, allowing visitors to experience the distinct characteristics of each source.
At an elevation of approximately 1,870 meters, Karasawa Kosen is a secluded mountain hot spring within the Yatsugatake-Chushin Kogen Quasi-National Park. The inn belongs to the Association of Secret Hot Springs of Japan, an organization dedicated to preserving traditional remote hot spring resorts.
The source water is naturally cold, at around 10°C, and is heated before being delivered to the baths. A particularly unusual phenomenon is reported to occur about once a year, when the spring water can turn milky white.
The hot spring is also associated with a long history. Local tradition holds that Takeda Shingen used the hot spring approximately 400 years ago to help his soldiers recover. Today, visitors can enjoy the same remote mountain atmosphere while experiencing the natural hot spring waters.
Shibu-Gotenyu Onsen is located deep within the Okutateshina hot spring area and has long been used as a base for travelers and climbers heading into the Yatsugatake mountains.
The hot spring is traditionally said to have opened around 783, and during the Warring States period it became associated with the legend of a “secret hot spring of Takeda Shingen.” The single inn stands at an elevation of approximately 1,880 meters and also accepts day visitors.
The water is a simple acidic sulfur spring. The facilities are intentionally traditional and include indoor baths rather than an outdoor bath. The East Bath is reserved for overnight guests, while the West Bath is available to day visitors.
Mount Tengu offers a different experience in every season. Summer brings cool mountain air and pleasant hiking conditions, while autumn transforms the surrounding forests with brilliant foliage.
Winter reveals a completely different side of the mountain, with snow and ice covering the rugged landscape. Winter climbing requires appropriate equipment, experience, and careful attention to mountain conditions.
Spring gradually brings new life to the forests and alpine environment as the snow retreats.
Mount Tengu brings together many of the experiences that make the Yatsugatake region special: rugged alpine ridges, quiet coniferous forests, mountain huts, remote hot springs, and spectacular panoramic views.
A climb to the summit offers the thrill of standing above the surrounding mountains, while a stay at a mountain hut or a soak in a secluded hot spring provides a slower way to appreciate the landscape.
For travelers looking for an authentic Japanese mountain adventure, Mount Tengu offers the rare opportunity to combine high-altitude hiking, alpine scenery, traditional mountain huts, and historic hot spring culture in a single journey through the Yatsugatake mountains.