Sukayu Onsen is situated on the western foot of the main peak of the Hakkoda Mountains, Mount Odake, which also happens to sit along the Ring of Fire, and is a high-altitude hot spring located approximately 900 meters above sea level. Surrounded by beautiful scenery and bountiful lands all around, in the spring, high-altitude plants blossom into beautiful flowers, and you can enjoy the brilliant colors of the Momiji in autumn.

In addition, as one of the world’s best-known destinations for immense snowfall, Sukayu is also a Mecca for skiers in winter. With snowfall exceeding five meters in some years, there is abundant high-quality snow, attracting skiers from Australia, Europe, and the rest of the world.

Sukayu’s history dates back to 1684. According to local lore, hunters tracking an injured stag through the deep Hakkoda wilderness watched the wounded animal flee into the dense alpine brush. Expecting the beast to collapse, the hunters were astonished to see the deer bound out moments later, fully restored and full of vigor. Tracing its tracks, they uncovered steaming thermal waters bubbling directly from the volcanic earth.

The spring was christened Shikayu ("Deer Spring"). Word of its restorative properties quickly spread among mountain foragers, loggers, and hunters, who constructed rustic shelters around the spring source. Over time, the name evolved into Sukayu, and the settlement grew into one of Tohoku’s premier yujiba—a traditional hot spring retreat where visitors stay for weeks to treat chronic ailments.

In 1954, celebrated for its pristine alpine climate, vast natural water output, and unmatched therapeutic efficacy, Sukayu was officially registered as Japan’s First Nationally Protected Hot Spring (Kokumin Hoyo Onsen-chi).

The name Sukayu translates literally to "Acidic Hot Spring." Fed by the volcanic plumbing of the Hakkoda range along the Pacific Ring of Fire, the spring water is intensely acidic (pH 1.7) and heavily infused with sulfur, hydrogen sulfide, and therapeutic minerals.

Tucked deep within the Hakkoda Mountains, Sukayu Onsen experiences massive multi-meter snowpacks and intense blizzards, making advance transit planning essential.

If traveling from Tokyo or Osaka, the most convenient option is to fly into Aomori Airport or ride the Tohoku Shinkansen directly to JR Shin-Aomori Station (or connect onward to JR Aomori Station). While there is no direct bus service from Aomori Airport to the onsen, you can easily connect to local transport from either central rail hub.

The JR Bus Mizuumi-go operates year-round between downtown Aomori and Lake Towada, stopping directly outside Sukayu Onsen:
・From JR Aomori Station (East Exit, Bay 11): ~70 minutes
・From JR Shin-Aomori Station (Shinkansen East Exit, Bay 1): ~80 minutes

Fares & Passes: Despite being a bus, the ride is fully covered by both the Japan Rail Pass and the JR East Pass. Simply show your valid rail pass to the driver when disembarking.

Guests staying overnight at Sukayu Onsen Ryokan can take advantage of the inn’s free private shuttle service. The bus departs once daily directly from the JR Aomori Station rotary (advance booking required when reserving your room).

Renting a car between late November and April demands serious caution and should only be attempted by drivers experienced with deep powder, black ice, and whiteout blizzards. Mountain roads feature steep inclines and sharp switchbacks that quickly become treacherous.

Vehicle Requirements: You must reserve an AWD or 4WD vehicle equipped with studless winter snow tires. Carrying tire chains in the trunk is strongly advised.

Road Closures: National Route 103 (the Hakkoda Gold Line) is gated shut nightly between 6 PM and 7:30 AM between Sukayu and Yachi Onsen. Severe blizzards can also trigger sudden daytime closures.

Rental Car Agencies: For prepared drivers, several major rental agencies—including Toyota Rent-a-Car, Nissan Rent-a-Car, Orix Rent-a-Car, and Nippon Rent-A-Car—are located within a short walk of both JR Aomori and Shin-Aomori stations.

After navigating the snowy mountain drive, a retro wooden building awaits you at Sukayu Onsen. With the giant characters for “Sukayu” on the signboard outside, you feel a sense of history. We step inside, brimming with anticipation.

The building’s interior is very spacious and reminiscent of the accommodations at a “yuji-juku,” meant for people staying at the hot springs for health reasons. Buy your tickets from the vending machines and head to the reception at the front desk, and you’re set to enter the springs.

Bath and face towels are provided, so you don’t need to bring anything. Besides this, the Hiba Sennin Furo is a bath only meant for soaking in, so a washing area is not included. Soap and shampoo are strictly prohibited there too, so do take note.

Once you’ve changed out of your clothing, head to the Hiba Sennin Furo. As you enter the bath area, the wide-open space and white steam covering the baths jump out at you. As the name implies, the Sennin Furo, meaning “thousand-person bath,” seems large enough to accommodate 1,000 people.

It is made of cypress wood from Aomori prefecture, and without a single pillar used in its construction, there is an overwhelming sense of presence, making you feel like you’ve become one with nature.

Before you use the baths, note two things. Although the Hiba Sennin Furo is technically a mixed bath, the left side is reserved for the gents, and the right side for the ladies.

Although there isn’t a partition, the men are asked to avoid an area so the ladies can enjoy the baths in peace of mind. For the gents, do mind your manners when entering the baths.

In addition, special ladies’ clothing, sold on-site and suitable for wearing into the baths, is available, so we recommend using it. Ladies-only times are also available, from 8 AM to 9 AM and 8 PM to 9 PM, so those who prefer to avoid mixed baths can go during those times as well.

Another point to note: the bath water is very acidic (pH 1.7), so when you enter the bath, you’ll feel a tingling sensation on your skin. Because sensitive skin may become inflamed, it’s recommended to limit your time in the bath to 10 minutes at most and avoid rubbing your body while soaking.

After you finish your soak, try a dip in the Netsuyu right in front. The name translates to “hot bath.” Though it may seem like a very hot bath, it’s actually at a comfortable temperature that’s easy to enter and warms your body nicely. With slightly cloudy water and a smooth feel on your skin, this historically famous bath soothes your body.

The next bath is deeper inside, the "Shiburokubu-bo-Yu." The name means "the bath of four parts and six parts" and refers to how close the water temperature is to your body temperature. If the Netsuyu is a ten on the scale, this bath is four to six.

The spacious bath interior has an open feel, and with bath waters slightly hotter than the Netsuyu, you can feel yourself comfortably sweating.

After you've washed off the sweat from the baths with cold water, head to the Yutaki. With forceful streams of water, you can concentrate the waters on your shoulders and other problem areas for a massage.

The trick is to allow the strength of the water striking your problem areas to gradually increase in strength, allowing you time to get used to the force of the water.

Finally, take another hot bath to warm up your body. Your body will have a slight smell of sulfur left on it, and you’ll find your body becoming lighter as a result of the special properties of the bath waters you’ve been soaking in.

To wrap things up, head back to the building and drink some spring water from Hakkoda to replenish the water your body lost.

Inside the building, besides the Hiba Sennin Furo, is a small bath called the Tama-no-Yu. The bathing area is divided into separate areas for men and women, so ladies can soak in peace of mind and enjoy spring water from another source, different from the Sennin Furo.

A washing area is available, with shampoo, conditioner, and body soap provided, so those who prefer a proper clean-up are encouraged to wash up here.

The Sukayu Onsen-juku is comprised of a “ryokan-tō,” with Japanese-style and Western-style rooms, as well as a “yuji-tō” for guests coming for “yuji,” where they use the bath waters to soothe their ailments and illnesses. A dining area near the yuji-tō, along with kitchen facilities for extended stays, is also available.

Especially in winter, many guests come for yuji, and many foreign visitors who come for skiing also use the yuji facilities.

While Sukayu Onsen is reason enough to visit Hakkoda, pairing your bath with local outdoor adventures makes for an unforgettable trip!

Just a short 10-minute bus ride or drive away sits the Hakkoda Ropeway. Large gondolas carrying up to 100 passengers lift you high above the snow-laden canopy to the peak of Mount Tamoyachi. From late January through February, the mountain’s Maries fir trees become completely encased in wind-blown ice and snow, transforming into world-famous “Snow Monsters” (Juhyo).

In addition, the ski season runs from early December to mid-May, giving you about half a year to enjoy it, and the 5-kilometer course with high-quality powder snow is also critically acclaimed. After you’ve enjoyed skiing along the whole mountain, you can warm up your body at the Sukayu Onsen for an enjoyable experience too.

Looking for additional lodging options in the Hakkoda area? Two fantastic mountain resorts nearby offer unique atmospheres and convenient shuttle connections.

Nestled quietly inside a giant beech forest, Hakkoda Hotel is a luxury Western-style wooden log lodge under Sukayu Onsen's management. Guest rooms feature grand panoramic views of the Hakkoda range, and the hotel's relaxing thermal baths are crafted from local beechwood.

Free shuttle transfers between JR Aomori Station, Sukayu Onsen, and Hakkoda Hotel are available exclusively for staying guests (advance reservation required).

Located near the dramatic Jogakura Bridge, Hotel Jogakura is a cozy, Scandinavian-style mountain resort surrounded by serene nature. It boasts year-round outdoor open-air baths (rotenburo), premium high-quality bedding, and exquisite local dining.

Non-staying guests can enjoy the baths from 11:30 AM to 3 PM (last entry at 2:30 PM). Day bath tickets are 1,000 yen for adults and 500 yen for elementary students. Be sure to bring your own towel, as towel rentals are not provided for day bathers.

Complimentary shuttle buses connect guests to Hakkoda Ropeway and Sukayu Onsen.

Surrounded by five-meter snowdrifts, frosty pine forests, and the deep serenity of northern Honshu, Sukayu Onsen delivers a classic winter escape.

Whether relaxing beneath the massive timber beams of the Sennin Furo, boarding the ropeway to stand face-to-face with frozen snow monsters, or enjoying a bowl of hot local noodles by the lobby hearth, a winter journey into the Hakkoda mountains remains one of Japan’s most rewarding alpine adventures

Text by: Shimoda Tsubasa