Unazuki Onsen: Hot Springs at the Gateway to Kurobe Gorge

Why Unazuki: Hot Springs at the Edge of the Gorge

Unazuki Onsen (宇奈月温泉) is a hot spring town wedged into a mountain valley in eastern Toyama Prefecture, directly at the entrance to Kurobe Gorge. The town exists because of two things: the hot spring water rising from deep underground, and the Kurobe Gorge Trolley Train (黒部峡谷鉄道トロッコ電車) that departs from the station here into one of Japan's deepest and most dramatic river canyons.

According to the Kurobe City Tourism Association, Unazuki's hot spring water is clear, colorless, and weakly alkaline — known locally for its skin-softening properties. The water temperature is high enough to heat the ryokan that line the gorge's edge, and the mountain setting gives many of their outdoor baths (rotenburo) views directly over the Kurobe River valley.

Unazuki is both a destination and a gateway. You can stay for the onsen alone, ride the trolley train into the gorge, or combine both across a leisurely overnight visit. The town is part of the broader Toyama city guide destinations and sits at the opposite end of the prefecture from the Tateyama Alpine Route.

The Hot Springs: Bathing Options in Unazuki

Ryokan Onsen and Private Baths

Most visitors experience Unazuki's hot springs through their ryokan. The town's traditional inns pipe the alkaline water directly into their bath facilities — indoor soaking tubs, outdoor rotenburo perched above the river, and in some cases private baths that guests can reserve for solo or family use.

The gorge-view outdoor baths are Unazuki's defining feature. Several ryokan position their rotenburo on cliff edges or elevated terraces overlooking the Kurobe River, and the experience of soaking in hot mineral water while looking out at forested canyon walls is the town's strongest draw.

Standard onsen etiquette applies: wash thoroughly at the shower stations before entering the bath, no swimwear, and keep towels out of the soaking water. Most Unazuki ryokan require tattoo cover-ups for shared baths — check with your specific property when booking.

Totoko no Yu: Free Riverside Footbath

For a quick soak without committing to a ryokan visit, Totoko no Yu (とと子の湯) is a free public outdoor footbath along the Kurobe River. According to the official Unazuki Onsen site, the footbath is named after trout ("totoko" in local dialect) and is open to anyone. It sits near the trolley train station, making it a convenient stop before or after a gorge ride.

The footbath uses the same alkaline hot spring water as the ryokan. Dip your feet, watch the river, and rest after the trolley ride — it's one of those simple pleasures that works perfectly as a transitional activity.

Ryokan Stays: Mountain Cuisine and Gorge Views

An overnight ryokan stay is the recommended way to experience Unazuki. The town's ryokan typically offer the 2-meal plan (1泊2食): kaiseki dinner and traditional Japanese breakfast included in the room rate.

According to Jalan, ryokan like YAMANOHA start from approximately ¥20,000 (~$133) per person per night with two meals. Premium properties with gorge-view baths range from ¥25,000-40,000+ (~$167-267+) per person. Prices are from 2025 data and may increase.

Dinner in Unazuki ryokan features local mountain and river ingredients. Many visitors on TripAdvisor highlight the Hoshihime trout (星姫鱒) — a rare, transparent trout unique to the Unazuki area streams, served fresh in kaiseki courses alongside mountain vegetables, Toyama bay seafood, and local rice.

Book directly with the ryokan or through Japanese platforms like Jalan and Rakuten Travel for the best rates and room selection. Peak foliage season (October-November) and summer holidays fill up quickly.

Kurobe Gorge Trolley: The Connection to the Canyon

The Kurobe Gorge Trolley Train departs from Unazuki-Onsen Station — the same station where you arrive from Toyama. According to the Kurobe Gorge Railway official site, the trolley operates from mid-April through late November (2025 dates: April 16 to November 30), with the line closed December through March due to heavy mountain snow.

The one-way fare to Keyakidaira (the final stop) is ¥1,860 (~$12) for adults and ¥930 (~$6) for children. The ride takes approximately 80 minutes each way along the Kurobe River, crossing bridges, passing through tunnels, and offering views of the gorge that are inaccessible by road.

For a complete guide to the trolley ride — including what to see at each stop, open vs. enclosed car options, and hiking from Keyakidaira — see our Kurobe Gorge trolley guide.

The practical combination: arrive in Unazuki in the afternoon, check into your ryokan, soak in the onsen, enjoy kaiseki dinner. The next morning, take the trolley into the gorge, return by afternoon, and head back to Toyama Station.

Getting to Unazuki Onsen from Toyama

Unazuki-Onsen Station sits at the end of the Toyama Chiho Railway line. From Toyama Station, the local train takes approximately 75 minutes and costs ¥1,200 (~$8) one way.

Route	Transport	Time	Cost
Toyama Station → Unazuki-Onsen	Toyama Chiho Railway	~75 min	¥1,200 (~$8)
Tokyo → Toyama → Unazuki	Shinkansen + local	~3.5 hours total	Shinkansen + ¥1,200
By car from Toyama IC	Hokuriku Expressway + Route 8	~1 hour	Highway tolls apply

The Toyama Chiho Railway is a private line — JR Pass does not cover it. Purchase tickets at the station.

The train journey itself is scenic, particularly in the final stretch as the line follows the Kurobe River valley toward the mountains. Many visitors on Reddit recommend sitting on the right side of the train for the best views.

Seasonal Guide and Practical Tips

Best Seasons to Visit

Season	Months	Trolley	Onsen	Highlights
Spring	Apr-May	Opens mid-April	Open	Fresh green gorge, cherry blossoms at lower elevations
Summer	Jun-Aug	Running	Open	Full gorge access, warm weather, river sounds
Autumn	Sep-Nov	Running	Open	Peak foliage along gorge (October-November) — most popular season
Winter	Dec-Mar	Closed	Open	Snowy onsen atmosphere, quiet town, lowest rates

Autumn foliage season (October-November) is the most popular and crowded period. The gorge's steep walls concentrate the fall colors, and the trolley ride through them is Unazuki's peak experience. Reserve trolley tickets and ryokan well in advance for these months.

Winter is the quietest season. The trolley does not run, but the ryokan remain open, and soaking in a gorge-view rotenburo with snow falling around you is a memorable winter onsen experience. Rates are at their lowest.

What to Know Before You Go

• Trolley comfort: The open-air trolley cars have no air conditioning or heating. In summer, bring water and sun protection. In spring and autumn, bring a light jacket — the gorge can be cool even on warm days.
• Cash: Carry cash for the trolley, footbath snacks, and smaller establishments. IC cards may not work everywhere in this rural area.
• Dinner timing: Ryokan kaiseki dinner is served at a fixed time (usually 18:00-19:00). Arrive by check-in time to settle in before the meal.
• Combining with Tateyama: Unazuki and the Tateyama Alpine Route are at opposite ends of eastern Toyama. Both are accessible from Toyama Station but in different directions — plan for separate day trips rather than combining them.

Frequently Asked Questions

Can I visit Unazuki Onsen as a day trip from Toyama?

Yes — the Toyama Chiho Railway takes 75 minutes each way (¥1,200 one way). A day trip allows time for the free Totoko no Yu footbath, lunch, and a walk around town. However, an overnight ryokan stay is recommended to properly experience the hot springs and gorge views, particularly if you want to ride the Kurobe Gorge trolley (80 minutes each way) on the same trip.

How much does a ryokan stay in Unazuki cost?

Ryokan with two meals (dinner and breakfast) start from approximately ¥20,000 (~$133) per person per night. Premium properties with gorge-view outdoor baths range from ¥25,000-40,000+ (~$167-267+) per person. These are 2025 rates — check Jalan or Rakuten Travel for current pricing. Book early for autumn foliage season (October-November).

When does the Kurobe Gorge Trolley Train operate?

Mid-April through late November (2025 dates: April 16 to November 30). The trolley is closed December through March due to heavy mountain snowfall. The one-way fare to Keyakidaira is ¥1,860 (~$12) for adults. Reserve in advance during peak foliage season as the trolley fills up quickly.

What is the best season to visit Unazuki Onsen?

May through October for combined onsen bathing and the Kurobe Gorge trolley ride. October-November offers spectacular autumn foliage along the gorge — the most popular (and crowded) season. Winter (December-March) provides a quiet, snowy onsen atmosphere at the lowest rates, though the trolley does not operate.