Sauna

Find your balance in the sauna

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Base Sauna

A proper Finnish sauna, yours alone for the whole session. A sauna room where you can pour löyly, and a cold bath filled with Kusatsu’s cold water. Room enough for up to three guests to take their time.

Hygge Haus Kusatsu is a small house of eight rooms, small enough that each party keeps its own quiet. Warm through, cool down in the cold bath, rest, and get back into the water — all at your own pace.

How to spend it

1. Warm through	Start in the sauna and let the heat reach the core. Do not push it — stop while it still feels good.
2. Cool down	Let the cold bath take the heat out of your body. No hurry, until your breathing settles.
3. Rest	Time spent just sitting, until your breath is even again. This is the quietest part.
4. Get into the water	Finish slowly in the onsen. There is both a sauna and a hot spring here.

JPY 2,000 for 50 minutes, entirely private (for up to two guests; from the third guest, JPY 500 per person is added). Each sauna guest receives one bath towel and one bottle of water (500 ml). We hand you the sauna key when you use it; afterwards, please return the towels together with the key to the front desk. It can be used from 15:00, after check-in, until 22:00. To book, let us know your preferred time in advance, or ask at the front desk at or after check-in.

Price	JPY 2,000 for 50 minutes (entirely private, up to two guests) / JPY 500 per person from the third guest (up to three guests)
Hours	15:00–22:00 (from check-in at 15:00)
Booking	Let us know your preferred time in advance, or ask at the front desk at or after check-in
Sauna room	Set to 100 °C (the actual temperature in the room is around 90 °C)
Cold bath	15–20 °C, varying with the season
Resting	There is a bench to rest on
Provided	One bath towel and one bottle of water (500 ml) per guest / the sauna key
Returning	After use, please return the towels together with the key to the front desk
Lending	We do not lend sauna hats or other items

Please note

Please do not use it after drinking. It is genuinely dangerous.
If you are unwell, or have a medical condition, please do not push yourself. If you are at all unsure, speak to your own doctor first.
Drink water often.

About the hot spring

Frequently asked questions

Is the sauna private?

It is reserved for your group alone. It takes up to three guests.

How much is the sauna?

JPY 2,000 for 50 minutes, and it is entirely private. That price is for up to two guests; from the third guest, JPY 500 per person is added. Each sauna guest receives one bath towel and one bottle of water (500 ml). We hand you the sauna key when you use it; afterwards, please return the towels together with the key to the front desk.

How do I book the sauna?

It can be used from 15:00, after check-in, until 22:00. Let us know your preferred time in advance, or ask at the front desk at or after check-in.

Is there a cold bath?

There is a cold bath, filled with Kusatsu’s cold water. It is around 15–20 °C, varying with the season. There is a bench to rest on.

How hot is the sauna?

It is set to 100 °C; the actual temperature in the room is around 90 °C.

Can I pour löyly?

Yes — you can pour water over the stones yourself. Please use only the water provided in the sauna room.

Do I get a towel for the sauna?

Each sauna guest receives one bath towel and one bottle of water (500 ml). We hand you the sauna key when you use it; afterwards, please return the towels together with the key to the front desk. We do not lend sauna hats or other sauna items. A yukata is provided in the room.

Is it all right to use it after drinking?

Using the sauna or bathing after drinking is genuinely dangerous, so please do not. The same goes for when you are unwell.

The washing area and bench at Base Sauna