Hakone prepares a new thermal hotel
HOTEL THE MITSUI HAKONE plans to open on 15 December 2026 in Kowakudani, in Japan’s Fuji-Hakone-Izu National Park. The property occupies a substantial wooded site associated with historic private retreats of the Mitsui family.
Reservations have been promoted ahead of the opening, but travellers should confirm when every restaurant and wellness facility will begin operating. A scheduled debut does not establish that all announced services are already available.
Private bathing as a daily ritual
The hotel intends to offer 126 rooms with private natural hot-spring baths as well as terraces or balconies. That arrangement allows couples and families to experience thermal water without relying exclusively on shared facilities.
Thermal bathing should be enjoyed with attention to temperature and the individual guest’s comfort. It is sensible to ask the hotel for guidance about bathing practices and any relevant restrictions before arrival.
Nature close to Tokyo
Hakone combines mountain scenery, art museums and historic sites within reach of major Japanese rail connections. A stay can balance cultural exploration with time spent quietly at the hotel, particularly in winter.
Travellers arriving with luggage may prefer a private transfer rather than several train changes. Mountain traffic and seasonal weather should be considered when booking a tight onward connection.
Food and a sense of place
The planned restaurants include SANKEI, drawing inspiration from Japanese ingredients and regional traditions. Dining can be an important part of a thermal-retreat stay, especially when menus respond to the changing season.
Visitors with dietary requirements should contact the hotel in advance rather than assume that a tasting menu can be altered at short notice. The precise offerings will be confirmed as the operation approaches opening.
Nature and heritage shape the project
The approximately 135,500-square-metre Kowakudani site is associated with former private villa retreats of the Mitsui family. It is a different setting from HOTEL THE MITSUI KYOTO, using woodland, thermal water and mountain scenery as the defining elements of a stay. The grounds look towards Mount Sengen, placing the seasonal landscape at the centre of the design.
There are 126 planned guest rooms, each with a private natural hot-spring bath and a balcony or terrace. This allows guests to enjoy thermal bathing without relying on communal facilities. A separate Thermal Spring facility is also planned for bathing in swimwear, a distinction international visitors should understand when deciding between private and shared wellness experiences.
Dining and private retreats across the grounds
The announced hospitality programme includes SANKEI for Japanese dining, the all-day restaurant RIVERINE and Bar LAMBENT. SANKEI incorporates kaiseki, sushi and teppanyaki experiences. This range could support a multi-night retreat without forcing guests to leave the property for every meal, although opening-day menus and service arrangements should be confirmed.
Five treatment rooms and a dedicated gathering space are among the planned facilities, broadening the potential audience to small private groups. The developer first announced the 15 December 2026 opening in July and began accepting reservations ahead of launch. The distinction is important: an advertised future hotel is not yet an operating property with every promised amenity available.
Who the hotel may suit
A room with a private bath can appeal to a couple seeking peace or a family balancing different preferences for public and private wellness spaces. The larger grounds may offer a contrast to a city hotel with extensive nearby shopping.
The quality of a restorative stay depends on thoughtful planning, not the number of activities booked. Guests will benefit from checking accessibility, dining reservations and the hotel's transport guidance before confirming the itinerary.
