Oyu in Nozawa Onsen: Hours, Bathing Rules and What to Expect

Checked: September 27, 2026 Oyu (often romanized as Ōyu) is a useful first stop if you want to understand how Nozawa’s public baths work. The timber bathhouse stands on the main street, and its two pools give you a choice between the hotter and cooler side. That does not make it a full-service day spa, though. The bath is maintained as a shared village facility, with simple changing and bathing spaces rather than showers, amenities or a lounge.

Oyu at a glance

The hours are seasonal, and the source temperature is not the same thing as the water temperature in the pools. Check the official guide to all 13 public baths before setting out, especially in winter or during a local closure.

The cooler pool is relative, not a temperature promise

The official listing describes Oyu’s two baths as atsuyu (hot water) and nuruyu (cooler water). It gives the spring source temperature as 66°C, but does not say that the cooler pool stays at a particular temperature such as 39°C or 40°C. “Cooler” means cooler than the other pool, not necessarily mild by the standards of a modern spa.

Nozawa’s public baths use source-fed water and can feel very hot. The tourist office says they are not temperature-adjusted by routinely adding water. Follow the posted bathing etiquette and take your time: rinse before entering, test the water carefully, and get out if you feel unwell. There is no prize for staying in a hot bath longer than is comfortable.

The spring’s reported 66°C is not a reason to assume either pool is that hot. It is a source figure, not a measurement of the bathing water. For a plain-language explanation of the distinction, see our guide to reading Japanese onsen water temperatures.

What the contribution covers—and what it does not

Oyu is one of 13 public baths cared for by local residents through the yunakama system. The tourist office invites guests to leave a voluntary contribution, or sanshi, in the collection box to help support that upkeep. There is no published admission price, so figures repeated on travel sites should not be treated as an official minimum.

The trade-off is a very simple facility. Nozawa’s public baths have no showers or hair dryers, and Oyu is not set up for a long rest or a meal. Bring a small washing towel and a dry change of clothes. If you need to wash your hair before catching a train, or want a shower and somewhere to sit afterward, use a paid facility such as Furusato no Yu or Spa Arena instead; the public-bath guide explains the difference.

A few things to know before you go

The baths are part of everyday village life, not staffed attractions. Wash before getting into the pool, keep towels out of the water, and leave the changing area usable for the next person. If the bath is too hot, follow the local instructions rather than treating the water tap as a way to cool the pool indefinitely; turn it off once the water is usable. The tourist office also says bathing late at night is not allowed for security and management reasons.

The current official pages do not give a clear tattoo policy for Oyu. If that affects your decision, ask the tourist office or the local operator before visiting rather than relying on an assumption.

Is Oyu the right bath for your visit?

Choose Oyu if you have time for one bath and want the central, best-known bathhouse, or if you are staying nearby and can return to your lodging to wash and dry off. Its location makes it easy to combine with a walk through the village, but that also means it is not the pick for guaranteed quiet.

If you are sensitive to heat, the official guide singles out Kuma-no-te-arai-yu as one of the milder public baths; its spring is listed at about 40°C. If you need showers, a hair dryer or a more controlled bathing environment, choose a paid facility. Nozawa Onsen’s public baths reward a slower, prepared visit—not a quick stop expecting hotel-style amenities.

Getting there and timing your visit

Oyu is in the walkable village centre, so there is no need to drive up to the bathhouse door. Drivers should use a designated village car park and continue on foot; parking rules and winter availability vary. The nearest rail hub is Iiyama Station, with onward bus service to Nozawa Onsen. Check the current bus timetable for your travel date, as it changes by season.

In April through November, Oyu opens at 5:00 am; from December through March, it opens at 6:00 am. It closes at 11:00 pm year-round. Those long hours leave room for an early or post-dinner visit, but allow time to bathe and change before closing rather than arriving at the last minute.

Frequently asked questions

Is Oyu free?

There is no fixed admission ticket, but visitors are asked to leave a voluntary contribution in the collection box. Calling it “free” misses the contribution that helps maintain the shared bath.

Is 66°C the temperature of the pool?

No. The tourist office lists 66°C as the temperature of the Oyu spring source. It does not publish a fixed bathing temperature for either pool.

Can I shower or dry my hair there?

No. Nozawa’s public baths do not have showers or hair dryers. Use a paid day-use bath if you need those facilities.

Can I take photos inside?

The village’s current media rules require prior permission for photography or filming at all 13 public baths. For an ordinary visit, leave your phone and camera out of the bathing area.

Sources

• Nozawa Onsen Mountain Resort Tourism Association, Public baths
• Nozawa Onsen Mountain Resort Tourism Association, Frequently asked questions
• Nozawa Onsen Mountain Resort Tourism Association, Prior permission for reporting and photography