Public bathhouse · Open
Yasaka-yu
- Day-use bathing
- Yes
- Fee
- ¥650checked 2026-10-09
- Hours
- 9:00–20:30checked 2026-10-09
Photo information
Save to passport
Official classification
Spring type (therapeutic classes)
Official spring-type name (as recorded)Simple and alkaline simple springs at Yumoto (30–80°C at source); across Hakone also chloride, sulfate and sulfur springs among others
- Source temperature
- Unconfirmed
- pH
- 9.3
- Flow rate
- Unconfirmed
- Radon
- Unconfirmed
Appearance & feel
Water colour · Feel
ClearYunohana (mineral flakes) · Yes
Colour and feel are listed only where a source states them. They vary by day and by bath.
What makes it special
About 85 minutes by train from Shinjuku, and you step off into the gateway of a mountain with seventeen hot-spring villages.
Facilities in this area
Facilities come from the register (Wikipedia, OpenStreetMap, official sites). Those marked "natural spring unconfirmed" are listed on the basis of their name only.
Day-use bath · Open
Tenzan Tojikyo (Tenzan bathhouse)
- Day-use bathing
- Yes
- Fee
- ¥1,450checked 2026-10-09
- Hours
- 9:00–23:00checked 2026-10-09
Baths2
| Type | Gender | Source | Bath temperature | Free-flowing | Added water | Heated | Recirculated | Disinfected |
|---|---|---|---|---|---|---|---|---|
| Open-air bath | Men only | Tenzan's seven sources incl. No. 74 | Unconfirmed | Unconfirmed[5] | Unconfirmed[5] | Unconfirmed[5] | Unconfirmed[5] | Unconfirmed[5] |
| Open-air bath | Women only | Tenzan's seven sources incl. No. 74 | Unconfirmed | Unconfirmed[5] | Unconfirmed[5] | Unconfirmed[5] | Unconfirmed[5] | Unconfirmed[5] |
Getting there
Reachable by public transport
From Shinjuku the Odakyu Romancecar reaches Hakone-Yumoto in about 85 minutes (from Tokyo Station change at Odawara). From the station, mountain trains and buses fan out to Tonosawa, Miyanoshita, Gora and Lake Ashi. For Tenzan take the Hakone Tozan bus on the Old Highway line from bay 4, about 10 minutes to Oku-Yumoto Iriguchi (260 yen), then a 5-minute walk.
- Getting there
- Hakone-Yumoto Station · 10
- Through the year
- Yumoto is low and rarely snowy, but the upper areas (Sengokuhara, Lake Ashi) ice over in winter. Volcanic activity in 2015 closed parts of Owakudani
- Checked
- 2026-10-09
About the water
Hakone-Yumoto's water is simple and alkaline simple spring: mostly clear, nearly odourless and gentle. Source temperatures range from 30 to 80°C, and Yumoto has more sources than anywhere else in Hakone; the 'Soyu' source said to have been found in 738 is still in use. Tenzan's No. 74 source is an alkaline spring of pH 9.3, so soft and low in magnesium that it is used for drinking and even for brewing coffee. Climb the mountain and the chemistry changes: Sengokuhara draws milky sulfur water from Owakudani, Miyanoshita and Sokokura have chloride springs, and Ashinoyu an alkaline sulfur spring, all within the same resort. Think of Yumoto as the mild water at the front door. We make no medical claims.
| Source | Source temperature | pH | Radon | Checked |
|---|---|---|---|---|
| Soyu, the original Yumoto source said to date from 738 | Unconfirmed | Unconfirmed | Unconfirmed | no check date |
| Tenzan No. 74 source | Unconfirmed | 9.3 | Unconfirmed | no check date |
Three things not to miss
Photo information
From seven springs to twenty
Across the whole Hakone volcano; Yumoto is the entrance The Edo-period 'seven springs' were Yumoto, Tonosawa, Dogashima, Miyanoshita, Sokokura, Kiga and Ashinoyu. Adding Ubako makes eight; nine springs opened since the Meiji era make 'seventeen'; and with Sounzan, Owakudani and Kojiri some count 'twenty'. The mountain yields 25,000 tonnes a day, the fifth-largest flow in Japan.
On the skirts of one volcano sit so many distinct spa villages that people count them by number. To grasp the scale of an onsen region, start at Yumoto and ride the mountain railway up.[1][4]
Photo information
Yasaka-yu, the town-run public bath
Yumoto 577 A communal bath run by Hakone town: 9:00–20:30, closed Thursdays, 650 yen for adults and 300 yen for children (residents pay a different rate).
In tourist Hakone this is one of the few places to share the locals' everyday bath for a few hundred yen. Try Yumoto's simple spring water here before the big complexes.[2]
Tenzan Tojikyo and Oku-Yumoto
Yumoto-chaya 208, about 10 minutes by bus from Yumoto Station A day-use bathing complex on the Sukumo river: 1,450 yen, 9:00–23:00, no closing day. Indoor and open-air baths and steam rooms; its No. 74 source, pH 9.3, is said to be the only spring in Hakone licensed for drinking. Restaurants and rentable tatami rooms too.
A place that calls itself toji (long-stay therapeutic bathing) and shows how to spend a whole day in the water without staying overnight. Being away from the station, the river is the loudest sound.[5][6]
The story
From the Soyu of 738
Hakone-Yumoto is the oldest of the seventeen springs. Tradition holds that in 738 the monk Jojobo found the 'Soyu' source, which is still in use today. Hakone's fame spread with Hideyoshi's siege of Odawara in 1590, when his encamped warriors are said to have used the baths. In the Edo period it flourished beside the Tokaido highway, and Yumoto, Tonosawa, Dogashima, Miyanoshita, Sokokura, Kiga and Ashinoyu were known as the 'seven springs of Hakone'; their water was carried to the shoguns in Edo as tribute. Yumoto still has the most sources, inns and guests, a position anchored by its role as the Romancecar terminus and the transfer point for the mountain railway and buses.[4][1]
Seven, eight, seventeen, twenty
Add Ubako, which lay off the highway, and you have 'eight springs'. From the Meiji era the mountain railway and new drilling opened nine more: Ohiradai, Kowakudani, Ninotaira, Gora, Miyagino, Sengokuhara, Yunohanazawa, Ashinoko and Takogawa, making the 'seventeen springs of Hakone'. Some add Sounzan, Owakudani and Kojiri for 'twenty'. According to the town's tourist association the whole mountain yields 25,000 tonnes a day, Japan's fifth-largest flow. The water ranges from Yumoto's simple spring to Sengokuhara's milky sulfur water piped from Owakudani, the chloride springs of Miyanoshita and Sokokura, and Ashinoyu's alkaline sulfur spring, so you can compare baths as you climb one volcano.[1][4]
The town's bath and a bath for toji
Hakone may feel like a resort, but Yumoto still has a town-run communal bath, Yasaka-yu, used by residents. The town lists it at 9:00–20:30, closed Thursdays, 650 yen for adults and 300 for children (a different rate for residents), about ten minutes uphill from the station. By contrast, Tenzan Tojikyo, ten minutes by bus up the Sukumo river in Oku-Yumoto, calls itself a day-use toji retreat, a place to spend a whole day in the water without a bed. It costs 1,450 yen, opens 9:00–23:00 with no closing day, and takes cash only. There are indoor and open-air baths and steam rooms, and its No. 74 source, pH 9.3, is said to be Hakone's only spring licensed for drinking. Restaurants and rentable tatami rooms are inside, including one reserved for solo visitors.[2][5][6]
Where tourism and bathing grew together
In 1919 the Odawara Electric Railway, forerunner of today's Hakone Tozan line, reached the mountaintop, and soon after the war Odakyu trains began running through to Hakone-Yumoto, transforming access from Tokyo. The rivalry between the Seibu and Odakyu groups, dubbed the 'Hakone mountain war', ended up drawing even more visitors. Every 3 November the Hakone Daimyo Procession re-enacts a feudal lord's march through Yumoto, and at Hatajuku on the old highway the yosegi marquetry workshops welcome learners. Hot springs are the foundation beneath all of Hakone's tourism, and Yumoto is where you first step onto it.[4][3][1]
Going solo
Easy for solo travellersUnconfirmed
Weekend / peak restrictionsUnconfirmed
Where to eat dinnerMany restaurants around the station and along the river
Private bathYes
checked 2026-10-09
Through the year
Recommended months
JanFebMarAprMayJunJulAugSepOctNovDec
Months open
JanFebMarAprMayJunJulAugSepOctNovDec
"Recommended" and "open" are recorded separately. Check the season for seasonal springs.
Nov — 3 November: the Hakone Daimyo Procession through Yumoto, re-enacting an Edo-period lord's march
Mar · Apr — Cherry blossom along the Hayakawa; Ohiradai is known for cherries and hydrangeas
Nov · Dec — Autumn colour reaches Yumoto last, late November to early December, while the heights turn wintry
Food, culture & experiences
Hakone Daimyo Procession
Every 3 November a feudal lord's procession in period dress parades through Yumoto; 2026 is the 73rd[3]
From the station along Taki-doriYosegi marquetry at Hatajuku
Workshops of the traditional yosegi wood-mosaic craft cluster at Hatajuku on the old highway, with hands-on classes[1]
About 15 minutes by bus from Yumoto on the Old Highway lineTenzan's restaurants: Yamaboshi and the onsen shabu-shabu at Rakuten
Nourishing dishes of mountain yam and eel, and shabu-shabu dipped in pH 9.3 alkaline spring water. No reservations; weekly closing days[5]
Inside TenzanThe mountain railway to Tonosawa, Miyanoshita and Gora
The switchback mountain railway climbs from Yumoto; each station is a different spa village with different water[1][4]
From Hakone-Yumoto StationEditors' guide
Arriving at Yumoto by Romancecar, leave your bags, walk up the hill and take a first dip in the town's bath at Yasaka-yu. Lunch along the Hayakawa. In the afternoon take the bus up to Tenzan in Oku-Yumoto and stay until dusk with the water and the river. Sleep in Yumoto, or one stop up the mountain railway at quieter Tonosawa. Next day ride the railway to Miyanoshita and Gora and feel how the water changes.
The "editors' guide" above is written by the editors from sources; it is not a visitor's opinion.
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Visitor reviews
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Overview
Hakone Onsen, or Hakone Hot Springs, is a general term for numerous thermal spas located in the town of Hakone, Ashigarashimo District, Kanagawa Prefecture, Japan, an area formerly known as Sagami Province. Situated about 90 kilometres (56 mi) southwest of Tokyo and 60 kilometres (37 mi) east-southeast of Mt. Fuji, it is one of the most popular hot spring resorts in central Japan. At least twenty hot spring spring resorts exist around Mt. Hakone, an area that is designated as part of the Fuji Hakone Izu National Park.
This overview is based on the lead section of the English Wikipedia article (CC BY-SA 4.0). View original page
Onsen areas nearby
Unconfirmed & notes
- Temperatures, pH and analysis sheets of Yumoto's sources unconfirmed (Wikipedia gives 30–80°C); Yasaka-yu's bath-management notice unread
- Yasaka-yu's founding year (1949) and transfer to the town appear only on review sites and are not used here
- Inns' solo-stay terms and prices, bus frequency and tattoo policies unconfirmed
Sources
- 箱根町観光協会 特集『箱根十七湯』一般財団法人箱根町観光協会 · 2026-10-09
- 箱根町 弥坂湯箱根町 · 2026-10-09
- 箱根湯本観光協会 公式サイト箱根湯本観光協会 · 2026-10-09
- 箱根温泉 - WikipediaWikipedia · 2026-10-09
- 天山湯治郷 天山(基本情報・お風呂・食事処)天山湯治郷 · 2026-10-09
- 天山湯治郷 アクセス天山湯治郷 · 2026-10-09
Register sources
- 箱根温泉 - Wikipedia(日本語版)Wikipedia · CC BY-SA 4.0 · 2026-10-09
- Wikidata Q908993Wikidata · CC0 · 2026-10-09
Data status
Name & locationPublishedCoordinatesPublishedSpring typePublishedPhotosPublishedFacilitiesPublishedVisiting info (dated)PublishedEditorial articlePublished
Updated 2026-10-09
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