フォートリート草津
Uses natural hot spring water
Enclosed indoor bathing area
Private onsen bath in guest rooms, for overnight guests only
Allows entry with visible tattoos
Cover required
Fourtreat Kusatsu was a small boutique hotel converted from a former company retreat in the Kusatsu onsen town. It had a communal bath plus onsen water piped separately into the guest rooms, and guests mentioned the two came from different springs. Rooms were quiet and design-led, with a self-serve herbal tea and drinks corner and an all-inclusive dinner plan. The hotel closed in the spring of 2026.
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Last updated August 5, 2026