Hakone Kowakudani Onsen Mizunoto

Three free garden private open-air baths fed by the Kowakudani source (the room baths are not onsen)

The details

Area

Hakone, Kanagawa

Private bath

Reservable private bath — Three free garden private open-air baths fed by the Kowakudani source (the room baths are not onsen)

Spring water

Chloride spring

Private-bath hire

Free for staying guests

Price guide

From ~$295 per night (checked on Klook, Nov 2026)

Access

About 85 min from Shinjuku by Romancecar limited-express train

Day-trip bathing

Overnight stay only

Steam over the valley, cedar on the wind — and Tokyo close enough that you can be in the water by lunch. The private bath works like this: you book it, it's yours. Door closed, steam up, nobody else's schedule anywhere near you. Take the late slot — night air on wet skin is the whole point.

What Japanese guests say

Translated from Japanese guest reviews — the texture English roundups rarely carry.

Guests keep coming back to: having the bath all to themselves · the quiet · the welcome

“I was glad there was shuttle service by minibus to the nearest station. There were two large public baths for each gender, with nighttime rotations, and three private baths—which was perfect for hot spring lovers. The room...”

Private-bath and water facts were checked against the property's official site and Japanese booking pages in November 2026. Room plans change — confirm the private bath is included in the plan you book.