Ultra-LuxuryCountryside
Karuizawa, Japan
24 rooms
Opened 2023
KKS Group / Modern Japanese Alpine Timber & Onsen Palace Architecture
Karuizawa, Japan
Spa & Wellness
Fufu Karuizawa Alpine Forest Spa & Wellness
The Spa at Fufu Karuizawa Restful Forest is a sanctuary of alpine thermal wellness. Facilities include private treatment suites, two large communal indoor and outdoor natural volcanic hot spring onsen baths fed by Mount Asama mineral springs, steam saunas, and therapies utilizing organic Nagano botanicals.
6:00am – 11:00pm daily
Facilities
- Two large communal indoor and outdoor natural volcanic hot spring onsen baths
- Luxury Spa featuring private treatment suites, steam saunas, and herbal rituals
- Private natural hot spring onsen baths in all 24 guest suites fed by continuous mineral springs
- Direct access to Karuizawa alpine hiking trails and complimentary shuttle to Karuizawa Station
Signature Treatment
Nagano Larch and Volcanic Mineral Polish and Four Seasons Restorative Deep Tissue Massage.
Fufu Karuizawa Alpine Forest spa FAQ
- What communal onsen facilities exist?
- The property features two large communal indoor and outdoor volcanic hot spring onsen baths.
- What mineral springs feed the baths?
- The baths are fed by natural mineral-rich volcanic hot springs from Mount Asama.
- What signature treatment is featured?
- The signature ritual is the Nagano Larch Polish and Four Seasons Restorative Deep Tissue Massage.
- What are the spa and onsen operating hours?
- The public onsen baths and spa are open daily from 6:00am to 11:00pm.
Reviewed by Hotel Flock · Last updated September 2026