Chiba · Yoro Valley Onsen
Yoro Valley Onsen Sagawa
養老渓谷温泉 嵯峨和
A 12-room inn in Yoro Valley, the Boso Peninsula's autumn-colour spot and the last place in the Kanto region to turn, peaking late November to early December. Boso's signature coffee-coloured alkaline 'black water' fills the indoor and open-air baths; day use is a flat ¥700 for ages 3 and up, 11:00–15:00. Eat lunch in the dining room and the bath is free — spring bamboo-shoot dishes are the speciality. Five minutes by bus from Yoro-Keikoku Station on the Kominato Railway to Yorokan-mae. Lunchtime opening can be suspended at short notice, so phone ahead.
- Price (adult)
- ¥700
- Hours
- 11:00–15:00
- Closed
- Irregular (check ahead)
- Access
- 5 min by bus (for Awamata) from Yoro-Keikoku Station to Yorokan-mae; 30 min by car from Ichihara-Tsurumai IC
- Water type
- Alkaline simple
- Tattoos
- Ask ahead
- Phone
- 0470-85-0146
- Official site
- www.mapple.net/region/a0303120501/spot ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Yoro Valley Onsen. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- Boso's coffee-coloured 'black water'
- Free bath with lunch
- Kanto's latest autumn colour (late Nov)
Before you go
- No official tattoo policy is published — ask at reception.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Payment is usually by ticket machine in cash — bring coins.
- Last entry is 30–60 minutes before closing.
Features
Mood & scenery
Price
Convenience
Amenities
✔ Verified operating: 2026-09 まっぷる・いこーよ・onsendiscovery 2026-06（700円・11–15時・不定休・食事で入浴無料）
Prices and hours change. Check official sources before visiting.
More in this area
Yoro Valley Goriyaku-no-yu
A day-use-only onsen on the Otaki side of Yoro Valley on the Boso Peninsula, near Awamata Falls. A rotenburo looking over wooded hills and a timber indoor bath hold the dark-tinted alkaline water typical of Boso. Popular after hikes and waterfall walks; towel and robe rental mean you can come empty-handed. Closes early at 18:00; Wednesdays off.
Kameyama Onsen Hotel
About 70 minutes from central Tokyo via the Aqua-Line, a hot-spring inn founded in 1950 on the shore of Lake Kameyama in the Boso hills. Its chocolate-brown 'kuroyu' bicarbonate water — billed as Boso's finest beauty bath — flows freely into a large bath with lake and forest views. Day use 11:30–18:00, ¥1,000 on weekdays; no day bathing Thursdays and Fridays. In autumn pair it with a foliage cruise on the lake.
Spa & Resort Kujūkuri Taiyō no Sato
One of the Bōsō peninsula's largest spa resorts, in Shirako on Kujūkuri Beach. Soak in iodine-rich, tea-coloured Chōsei spring water in the open-air bath, with seven rock-bath rooms, saunas, nap lounges, banquet halls and lodging on site. Open straight through from 10:00 to 08:00 the next morning; stays past 01:00 incur a late surcharge. Free shuttle from JR Mobara Station (reservation required). ¥1,600 weekdays, ¥1,900 weekends. Tattoos—including stickers and paint—are strictly refused.