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Tanigawadake by the Tenjin Ridge | A Day-Hike Guide to Timings, Difficulty and Clothing

2025.10.03

"Can a beginner do Tanigawadake in a day?" Plenty of people know the name but hesitate, put off by its rather ominous nickname — the demon mountain.

The short answer: take the ropeway and follow the Tenjin ridge, and in the snow-free season Tanigawadake is comfortably within a beginner's reach as a day hike. But only if you choose the route and the season correctly. On the same mountain, a different ridge or a different month makes it an entirely different proposition.

This is an account of walking Tanigawadake (1,977 m) — a peak on the Gunma–Niigata border and one of Japan's 100 Famous Mountains — in a day, from the Tenjindaira ropeway to its twin summits, Toma-no-Mimi and Oki-no-Mimi. Timings, difficulty and clothing, and also an honest look at why it holds the world record for fatalities, and what I noticed on the ground about staying safe.

The route in brief (out and back on the Tenjin ridge from Tenjindaira)

• Range: the Tanigawa massif, on the border of Gunma and Niigata
• High point: Oki-no-Mimi (1,977 m) and Toma-no-Mimi (1,963 m) — a twin-peaked summit
• Route: Tenjindaira (ropeway top station, 1,319 m) → Tenjin Pass viewpoint (out and back) → Kumaanazawa emergency hut → Tengu-no-Tamariba → Tenjin ridge → Toma-no-Mimi → Oki-no-Mimi, then back the same way
• Timing: about 2 hours 15 minutes and 3.5 km from Tenjindaira to the summit, one way
• Elevation: under 2,000 m, yet the weather changes with extraordinary speed
• Difficulty: ★★☆☆☆ (the Tenjin ridge is beginner-friendly when free of snow). Less about hard rock than about having the legs for a long run of steps. Note that under snow this is an entirely different, advanced mountain

There are several ways up Tanigawadake. I took the Tenjin ridge, the easiest walking and the one where the ropeway does the height gain for you. The ridgeline that waited up there had far more variety than a sub-2,000 m mountain suggests.

Why Tanigawadake is called the demon mountain

You can't discuss this mountain without addressing its reputation. It isn't even 2,000 m high, and yet more than 800 people have died on it — it's known worldwide as the deadliest mountain there is. My own honest curiosity about why so many accidents happen here was a large part of what brought me.

Some of it is geography. Tanigawadake sits where Pacific-side and Sea-of-Japan-side weather systems collide, and the weather changes astonishingly fast. On our day it was cloudy at the foot, and on the ridge blue sky and dense white cloud swapped places every few minutes. I'd been told the Niigata–Gunma boundary means a lot of cloud and unsettled conditions, but the speed of it still surprised me.

The two causes most often cited are exhaustion leaving people unable to move and falls on steep terrain. And they don't happen independently — fatigue produces a bad decision, and the bad decision produces the fall. On the long horseshoe traverse it's the chronic tiredness of distance; on the Nishiguro ridge, with its run of chain sections, it's the erosion of concentration. Which route you pick changes the very nature of the risk.

Knowing that, entering by the least demanding line — the Tenjin ridge — struck me as the first step in getting along with this mountain as a beginner.

Starting from the Tenjindaira ropeway — the Tenjin Pass viewpoint and an old shrine

The walk begins at Tenjindaira (1,319 m), the ropeway's upper station. Gaining that much height in one go lowers the barrier considerably if you're not confident about your fitness. There are short walking paths around the station and even hammocks to lie in — a surprisingly well-appointed place, with options for serious hikers and gentle strollers alike.

From Tenjindaira you can take a further chairlift up to Tenjin Pass. The forecast high that day was 19 °C. Stepping off the lift the air was already cool, and long sleeves felt about right. The trees below were just beginning to turn; autumn was on its way.

There's a viewpoint at Tenjin Pass, and in clear weather it's the place to see the twin summits — except that we were inside a wall of white. "It should be right there, and I can't see a thing," was how we started, laughing. Near the pass stands an old shrine to Tenjin, the deity of learning, associated with Sugawara no Michizane. The spring water welling from the rocks was long valued by travellers as a cure for eye ailments, and is said to feed the hot springs at Tanigawa Onsen below. The view was a write-off, but stories like this are part of what a day in the mountains gives you.

Tenjin Pass is a small detour off the main line, so after the viewpoint you drop back down and join the Tenjin ridge trail. We said a word for a safe day and turned to the climbing proper.

Up the Tenjin ridge — Kumaanazawa hut and Tengu-no-Tamariba

The early Tenjin ridge is well-made boardwalk, easy enough to feel almost anticlimactic. Don't relax, though: the route drops before it climbs again, and it quietly eats into your legs.

Before long you reach the Kumaanazawa emergency hut, about 2.8 km from the summit. On this mountain in particular, a shelter to retreat to when the weather turns feels genuinely reassuring. Past it the gradient steepens and the trail turns rocky.

The landmark for the middle section is Tengu-no-Tamariba, a jumble of large boulders. It falls roughly at the halfway point and a lot of people stop here. I sat down and imagined the view somewhere out beyond the cloud, thinking how good it must be on a clear day.

The second half is the run of step-like climbing the Tenjin ridge is known for. No single step is hard; cumulatively they get you. I was honestly flagging — "my legs aren't coming up any more" — but the wind kept tearing brief holes of blue overhead, and that carried me up. Once past the junction with the Nishiguro ridge, the summit is close.

The twin summits, and where their names come from

Tanigawadake's summit is a pair of peaks: Toma-no-Mimi (1,963 m) nearer, and Oki-no-Mimi (1,977 m) beyond. You stand on Toma first, then go on to the high point at Oki.

The odd names become endearing once you know them. Seen from a distance the two peaks look like a cat's ears, which is where "mimi" — ears — comes from, and locally they've long been called simply "the two ears." *Toma* means the near one and *Oki* the far one, as seen from the town below. Toma-no-Mimi was once also called Yakushidake, and Oki-no-Mimi carried the alternative name "Tanigawa Fuji." Small pieces of trivia like this change how the same view tastes.

As for the view: the moment we reached the top, the wind swept the cloud away and the sky opened. Mountainsides running away along the ridge, a sea of cloud moving like water — "I was afraid it would be white the whole time; I'm so glad we came" is more or less what came out of my mouth. Of course, raise a camera and thirty seconds later it's white again, which is Tanigawadake being Tanigawadake. Even so, walking that ridge during the breaks in the cloud made the whole effort worth it.

Can a beginner do it in a day? On the difficulty

Having walked it, my honest verdict: in the snow-free season the Tenjin ridge is comparatively approachable among the 100 Famous Mountains, and a beginner can certainly do it in a day. The ropeway and chairlift take out enough of the height gain to bring the physical bar down a long way.

What I don't want to imply is that it's easy. The difficulty isn't rock or chains — it's stamina, the ability to keep going up a long staircase. It had been a while since my last hike and my legs felt it in the second half. Pace it sensibly and take frequent breaks.

The Nishiguro ridge on the same mountain, by contrast, is an advanced route with chain section after chain section, difficult in an entirely different way. And the thing to be most careful of is snow season. Snow that melts by day and refreezes overnight forms hard ice that demands winter-mountain technique and equipment, or more. The residual-snow period around Golden Week in early May is especially treacherous, because it's when people go in under-equipped. A slip becomes life-threatening within seconds, so an ice axe you can self-arrest with and 12-point crampons are effectively mandatory. "Beginner-friendly" applies strictly to the Tenjin ridge without snow.

Clothing, kit and safety on a mountain that changes its mind

Where the weather turns this fast, your kit is your peace of mind. What I paid attention to on this trip:

• Clothing: early autumn, a forecast high of 19 °C, and long sleeves felt right from the start. The ridge is windy, though, and even in sunshine the effective temperature drops sharply. Carry an insulating layer and a wind shell you can put on and take off as you go.
• Rain shell: this is a mountain where unsettled weather is the baseline. Jacket and trousers both, regardless of the forecast.
• Headlamp and spare warm layers: being under-equipped here can be fatal. Even on a day hike, both go in the pack.
• Filing your climbing plan: Gunma Prefecture encourages online submission. If something goes wrong, it's what gives a search team something to work with. Worth making a habit of.
• Planning: accidents on Tanigawadake tend to turn serious when inexperience and inadequate kit coincide. Judge the difficulty of your route accurately, and build a margin into the plan from the outset. That's the real safety measure.

Precisely because the ropeway makes it so accessible, you don't cut corners on kit or planning. That, I think, is how you get along with the demon mountain.

Access

The ropeway starts from Doaiguchi Station at the foot. By car, the gateway is the Minakami interchange on the Kan-Etsu Expressway, and there's parking at the station. By train, the nearest stop is Doai Station on the JR Joetsu Line — famous as a "mole station," with its downbound platform buried deep underground and a very long staircase up to daylight — and you can walk to the trailhead from there. The ropeway takes you straight to Tenjindaira at 1,319 m, so you arrive with your legs intact and can concentrate on the walking.

What I took away

I arrived slightly braced by the phrase "most fatalities in the world," and found that, limited to the Tenjin ridge without snow, Tanigawadake is a superb and varied mountain a beginner can genuinely enjoy. The ropeway for height, boardwalk to start, Tengu-no-Tamariba, then the staircase — and the view from the twin summits at the end of it stays with you in proportion to the effort.

At the same time, I understood in my body that the nickname is earned. Weather that turns in an instant, fatigue that leads to other mistakes, and a difficulty that swings wildly with the route and the season. It's one of the 100 Famous Mountains, so it's busy and the trail is well maintained — but it is not merely a casual mountain.

Which is why the formula matters: the Tenjin ridge, the snow-free season, warm layers and a rain shell and a headlamp, a climbing plan filed, and time in hand. Keep to that and Tanigawadake will give you a memory for life. Thinking back to those glimpses of ridge through the cloud, I hope you go and find those two ears for yourself one day.

🛒 See the gear from the video as a list → A packing list for your first low-mountain hike

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