Japan Onsen Atlas温泉アトラス
View down over the Kofu basin
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Hokuriku & Koshinetsu · Onsen area

Hottarakashi Onsen

ほったらかしおんせん · ほったらかし温泉

Yamanashi · 山梨市

Status unconfirmed100 Onsen to Know Japan — No. 46
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Official classification

Spring type (therapeutic classes)

Simple hot spring

Official spring-type name (as recorded)Alkaline simple hot spring (both baths); the official site describes it as 'strongly alkaline, pH 10.1'

Source temperature
32–41.4°C
pH
9.6–10.1
Flow rate
306 L/min
Radon
Unconfirmed

Appearance & feel

Water colour · Feel

ClearSilky / slippery

Colour and feel are listed only where a source states them. They vary by day and by bath.

What makes it special

It opens an hour before sunrise. From the open-air bath you watch the lights of the Kofu basin go out and Mt Fuji turn white.
Why?

The official site posts hours of 'one hour before sunrise to 22:00 (last entry 21:30)', opening around 4:00 in summer and 6:00 in winter, 900 yen for adults, open every day. Wikipedia notes the view over the Kofu basin to Mt Fuji and about 450,000 visitors a year.[1][2]

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

Hottarakashi Onsen

Day-use bathing
Yes
Fee
¥900checked 2026-10-09
Hours
日の出1時間前–22:00(夏は4時頃・冬は6時頃開場)checked 2026-10-09
Official site
Baths2
TypeGenderSourceBath temperatureFree-flowingAdded waterHeatedRecirculatedDisinfected
Open-air bathSeparateAtchi-no-yu sourceUnconfirmedUnconfirmed[1][2]Unconfirmed[1][2]Unconfirmed[1][2]Unconfirmed[1][2]Unconfirmed[1][2]
Open-air bathSeparateKotchi-no-yu sourceUnconfirmedUnconfirmed[1][2]Unconfirmed[1][2]Unconfirmed[1][2]Unconfirmed[1][2]Unconfirmed[1][2]

Getting there

Hard to reach by public transport

About 10 minutes by taxi (around 2,400 yen one way) from Yamanashi-shi Station on the JR Chuo Line. A city bus runs 4 times a day to Fruit Park, then a 20-minute uphill walk. By car, about 25 minutes from the Katsunuma or Ichinomiya-Misaka exits of the Chuo Expressway; free parking for 280 cars.

Getting there
Yamanashi-shi Station · 10
Getting there
City bus 4 times a day (to Fruit Park only)
Through the year
Book a taxi in advance for a pre-dawn visit; the front desk gives taxi numbers for the return
Checked
2026-10-09
Show on mapOpen in Google Maps

About the water

Each bathhouse has its own source. According to Wikipedia, Kotchi-no-yu's is 32 °C, pH 9.6, 306 litres a minute and Atchi-no-yu's 41.4 °C, pH 10.1, 183.6 litres a minute, both alkaline simple springs. The official site calls it strongly alkaline at pH 10.1, gentle on the skin and 'soft to the touch, leaves the skin smooth, keeps you warm'. Water above pH 10 lifts dead skin a little like soap, hence the slippery feel. As a low-mineral simple spring it is easy to stay in for a long time. The site lists many indications such as neuralgia and joint pain; no medical claims are made here.

Indications (as posted on the analysis)

Neuralgia, muscle and joint pain, frozen shoulder, motor paralysis, stiff joints, bruises, sprains, chronic digestive complaints, haemorrhoids, poor circulation, convalescence, fatigue and general health (as posted on the official site)

Indications are an official statement based on the water analysis, not a guarantee of treatment. They are kept separate from opinions.

SourceSource temperaturepHRadonChecked
Kotchi-no-yu source329.6Unconfirmedno check date
Atchi-no-yu source41.410.1Unconfirmedno check date

Three things not to miss

View down over the Kofu basin
Photo information
Σ64 CC BY 3.0 View original page
01

Sunrise from Atchi-no-yu

The larger bathhouse on the east side The newer bathhouse, opened December 2002. It opens an hour before sunrise, so the basin's night lights, the dawn and Mt Fuji come in one sitting. Alkaline simple spring, 41.4 °C, pH 10.1 (Wikipedia).

This is the bath that popularised going to a hot spring for the scenery; worth timing your visit to first light.[1][2]

02

Kotchi-no-yu

The original bathhouse on the west side The first bathhouse, opened July 1999. Alkaline simple spring, 32 °C, pH 9.6, 306 litres a minute (Wikipedia). Smaller, with Mt Fuji straight ahead.

'That one' and 'this one', as the names say; each has its own admission.[1][2]

Breakfast tray at Hottarakashi Onsen
Photo information
zenjiro CC BY 2.0 View original page
03

Fried onsen eggs after the bath

Outside the baths at the Kimamaya and Momotaro stalls Stalls on site serve breakfast, the house speciality of deep-fried onsen eggs, and noodles; a shop sells Yamanashi produce.

True to the name, 'left to your own devices', service is minimal, but breakfast outdoors after a dawn bath has become the ritual here.[1]

The story

What 'hottarakashi' means

The name means roughly 'left alone', chosen to warn visitors from the start that there would be no attentive service (Wikipedia). Kotchi-no-yu ('this bath') opened in July 1999 and Atchi-no-yu ('that bath') in December 2002, each with its own source and its own admission. The site sits on a hill with the Kofu basin spread below and Mt Fuji ahead. With no lodging and day use only, it still draws about 450,000 people a year.[2][1]

One hour before sunrise

What sets this bath apart is its opening time. The official site gives 'one hour before sunrise to 22:00', which means around 4:00 from May to July and around 6:00 from December to February. You enter while the basin's lights still glitter, watch the sky pale, Mt Fuji's outline sharpen and the sun strike it, all from the water, then eat breakfast at the stalls outside. It is one of the places that taught Japan to visit a hot spring for the view.[1][2]

pH 10 water

The water itself is understated: an alkaline simple spring, per Wikipedia 32 °C and pH 9.6 at Kotchi-no-yu, 41.4 °C and pH 10.1 at Atchi-no-yu. Above pH 10 the water very slightly dissolves the skin's surface, giving the slippery feel. The site describes it as low in irritation and suitable for sensitive or older skin. Tattoos are explicitly allowed; towels are sold, not rented.[2][1]

Going solo

Easy for solo travellersNo
Weekend / peak restrictionsUnconfirmed
Where to eat dinnerOn-site stalls serve breakfast, noodles and fried onsen eggs
Private bathNo

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 · Dec · Jan · Feb — Clearest air and the best Mt Fuji views; opening around 6:00 makes the sunrise easy to catch. Watch for icy roads

May · Jun · Jul — Opens around 4:00; from the basin's night lights into dawn

Jul · Aug — Night views over the basin; Mt Fuji often hidden by cloud

Food, culture & experiences

Proposed (not yet bookable)

Katsunuma wineries

The Katsunuma area around the expressway exit is Japan's best-known wine district; an easy stop on the way back (times unconfirmed)[1]

About 25 minutes by car (to the Katsunuma exit)

Editors' guide

Look up the sunrise time and book a taxi to arrive an hour before. Start in Atchi-no-yu for night lights through to sunrise, then breakfast at Kimamaya. With time to spare, try Kotchi-no-yu too (separate ticket). Public transport is awkward, so plan on a car or taxi. Winter gives the clearest Mt Fuji.

The "editors' guide" above is written by the editors from sources; it is not a visitor's opinion.

Photo gallery

Visitor reviews

No reviews yet. While the review platform is being prepared, we do not display fictional reviews or ratings.

Review posting is in preparation, with visit date, facility, comments on water, scenery and access, photos, language and reporting.

Overview

ほったらかし温泉（ほったらかしおんせん）は、山梨県山梨市矢坪に位置する日帰り温泉施設。年間約45万人が訪れる人気温泉である。

This overview is based on the lead section of the Japanese Wikipedia article "ほったらかし温泉" (CC BY-SA 4.0). View original page

Onsen areas nearby

Unconfirmed & notes

  • Spring type, temperature, pH and flow come from Wikipedia; the official notices on water handling could not be read
  • Tub temperatures were not confirmed
  • City bus times and fares unconfirmed

Register sources

Data status

Name & locationPublishedCoordinatesPublishedSpring typePublishedPhotosPublishedFacilitiesPublishedVisiting info (dated)PublishedEditorial articlePublished

Updated 2026-10-09

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