Noboribetsu Grand Hotel: Is the Open-Air-Bath Room Worth It?

At Noboribetsu Grand Hotel, the room upgrade and the onsen are two separate decisions. The hotel has seven rooms with an open-air bath, but that bath uses artificial radium spring water—not the natural hot-spring water in the shared bathing areas. If you want to bathe privately in natural spring water, ask about the reservable family bath instead. If the Oni Sauna is your priority, pay attention to which side of the public bath is assigned to you on your dates.

That distinction is easy to miss when a booking site labels a room “with open-air bath.” The hotel lists five Western-style rooms and two Japanese-style rooms in this category. Both have an outdoor tub for private use, but neither room type is described as having a natural onsen bath.

What the room upgrade actually buys

The seven open-air-bath rooms are a fit if you want to soak without sharing a bathing space or waiting for public-bath opening hours. The hotel says their tubs use an artificial hot spring made with radium mineral water. That is a different offer from a guest-room bath fed by Noboribetsu’s natural spring water.

For many stays, a standard room plus the shared baths is the more direct choice. The public bathing areas offer saline, iron and sulfur spring types. You do not need to book an open-air-bath room to use them, and the hotel does not say that upgrading adds a fourth spring type or gives access to a separate sauna.

The hotel lists five Western-style rooms and two Japanese-style rooms with an open-air bath. Its current room page also lists standard twin rooms of about 24 m², comfort twins of about 27 m², superior twins of about 48 m², and Japanese-style rooms of about 32 m². Room layouts and availability depend on the date. If the bath is the only reason to upgrade, check what type of water it uses before paying the difference.

Private natural bathing is a separate booking

The hotel has one reservable family bath for up to four people, with two washing stations. Its water is a source-fed saline spring. Sessions are 50 minutes and currently cost ¥4,400; reservations are required. Day visitors pay their admission fee separately, while overnight guests should check how the session is handled under their booking.

This is the option to ask about if you want a private space and natural spring water. It is not in the guest room, and availability is limited to one bath. Reserve ahead rather than assuming you can arrange it after arrival.

The Oni Sauna changes sides by date

The Oni Sauna is in Hozuki-no-yu, one of the hotel’s two public bathing areas. The men’s and women’s assignments alternate by calendar date: women use Hozuki-no-yu on odd-numbered dates, while men use it on even-numbered dates. The other side has its own sauna, so the date affects which sauna design you can use, not whether the hotel has sauna access at all. Bathing areas switch overnight during cleaning.

The Oni Sauna is listed at about 110°C and seats up to 14. Automatic löyly runs hourly at 30 minutes past the hour. Published hours are 12:30 p.m.–midnight, starting at 2:30 p.m. on Mondays and Thursdays, then 6–10 a.m.

The giant outdoor barrel cold bath is closed from December through March. Children aged 12 or younger may not use it. Check current notices before planning a winter visit around that tub.

The barrel uses stream water from the northeastern foothills, not spring water; the listed water temperature is about 16°C. The wood tub is roughly 170 cm in height and diameter—those are the tub’s dimensions, not the water depth. Its 2026 seasonal opening was announced for April 9. Since it closes during the coldest months, check the hotel’s current notice before travelling specifically for it. The cold plunge is not for children aged 12 or under.

The public baths are listed for overnight guests from 12:30 p.m. to 2:30 a.m. and 3:30 a.m. to 10 a.m.; Mondays and Thursdays start at 2:30 p.m. for cleaning. The 2:30–3:30 a.m. closure is for cleaning and changing the bathing-side assignments. The garden outdoor bath has a separate overnight closure from midnight to 4 a.m. Late arrivals should check which facilities will still be open rather than treating “overnight bathing” as continuous access.

The shared baths also have saline, iron and sulfur spring types, with a garden open-air area. Not every tub has the same water-treatment method; the hotel notes circulation, filtration, disinfection, heating or added water for particular baths. “Three spring types” is a useful summary of what guests can compare, not a claim that every pool is untreated source water.

The buffet includes Japanese, Western and Chinese dishes, with some items cooked to order. Dinner is generally served from 6–8 p.m., with last orders 15 minutes before closing; busy nights may use staggered seating. Breakfast is listed from 7–9 a.m.

This setup gives families and groups a wider choice of dishes. For a quiet, coursed dinner, a smaller inn may fit better. Check the final dinner seating if you expect to arrive late.

Getting there and who should choose this hotel

From JR Noboribetsu Station, the local bus takes about 16 minutes to the Noboribetsu Onsen Bus Terminal; the hotel is about a one-minute walk away. That short final walk is particularly useful in snow or with heavy bags. The property lists about 100 free parking spaces for guests arriving by car. For the full transfer, see the Sapporo and New Chitose access guide.

The guide’s seven editorial ratings are bathing comfort 93, variety 94, upkeep 84, scenery 90, quiet 75, access 98 and value 92. These are comparative assessments, not hotel-published scores. The Grand Hotel is a large property; guests seeking a small, quiet inn may prefer another stay.

The hotel’s tattoo rules for its public baths are unstated. Confirm with the hotel before the cancellation deadline if you plan to use them. A reservable family bath is available, but its existence does not indicate whether tattoos are permitted there.

Choose a standard room if the natural springs and sauna are your priorities. Consider an open-air-bath room if you value privacy and in-room access and are comfortable with an artificial radium bath. If a private natural spring inside the guest room is essential, this is not the right room category; compare a hotel that explicitly lists that feature.