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Tsubakurodake to Otenshodake on the Omote-Ginza | A Two-Day Guide to the Kassen-One Climb, Enzanso and the Ridge

2024.07.28

If you've been looking at the high ridges of Japan's Northern Alps and wondering where to start, the route I'd point you to first is the Omote-Ginza, one of Japan's classic alpine ridge traverses. This time I walked the section from Tsubakurodake (2,763 m), the peak that opens the route, to Otenshodake (2,922 m), the highest point on the Omote-Ginza, over two days with one night on the ridge.

In this post: how to tackle the steep Kassen-One climb that starts at the Nakabusa Onsen trailhead, the famous ridge-top hut Enzanso, and the walk along white granite sand that follows — the itinerary, rough timings, the highlights, and what it actually felt like. The climb is hard work, but the moment you step out onto the ridge, you'll know it was worth it. I hope this helps if you're planning your first trip into the Northern Alps.

Route summary (two days, Omote-Ginza, Northern Alps)

• Area: The Jonen range, Northern Alps (Azumino and Omachi, Nagano Prefecture)
• Main peaks: Tsubakurodake (2,763 m) and Otenshodake (2,922 m, the high point of the Omote-Ginza)
• Trailhead: Nakabusa Onsen, a hot-spring inn at about 1,450 m
• Day 1: Nakabusa Onsen → the Kassen-One ridge (First, Second and Third Benches, then Kassen-goya hut) → Enzanso (overnight) → out and back to Tsubakurodake
• Day 2: Enzanso → south along the Omote-Ginza ridge to Otenshodake → back the same way and down the Kassen-One
• Access: A hikers' bus to Nakabusa Onsen from Hotaka Station on the JR Oito Line. By car, there's a hikers' car park at Nakabusa Onsen, which fills early in high season
• Difficulty: ★★★☆☆, with the demand mostly on fitness. There isn't much exposed rock, but you climb over 1,300 m and spend time near 2,900 m, so you need the legs for it and some tolerance for altitude

What the Omote-Ginza actually is

The Omote-Ginza is the popular traverse that runs from Tsubakurodake over Otenshodake and on to Yarigatake. The name borrows Tokyo's Ginza — it's the well-trodden main street of Japanese ridge walking.

What makes it special is the openness once you're up. Around Tsubakurodake the ground is pale granite sand and gravel, closer to a beach set at altitude than a mountain. Look back and the ridge you walked runs away behind you; on a clear day you can see all the way to the spire of Yarigatake. The Tsubakurodake–Otenshodake section I walked is the best of the Omote-Ginza compressed into two days. You don't have to push on to Yarigatake to get the full effect, which is exactly what makes it a good introduction.

Starting from Nakabusa Onsen

The route begins at Nakabusa Onsen, the hot-spring inn at the foot of the Kassen-One ridge. You're already at roughly 1,450 m here, and from this point you climb straight for the ridge. By public transport it's the hikers' bus from Hotaka Station; by car there's a hikers' car park, but this is a popular route and it tends to fill early on summer mornings. Give yourself time.

The sun was strong from the first steps, strong enough on my face that I was already thinking "this is going to be hot." What saved us was the air: around 18°C and dry. Summer climbs are sweaty by nature, and low humidity alone changes how the whole day feels. We talked about how good it was to be there, and walked into the forest in good spirits.

The Kassen-One climb — moving up bench by bench

The Kassen-One ridge, the way up to Tsubakurodake, is counted among the three great climbs of the Northern Alps. It earns that. Helpfully, though, rest points are spaced out along it at regular intervals: First Bench → Second Bench → Third Bench → Fujimi Bench → Kassen-goya hut. You climb from one target to the next.

I dropped my pack at the First Bench and ate an apple. Walking with the clock broken into pieces — "about 50 minutes to the Second Bench" — gives a long climb a rhythm you wouldn't otherwise find. Thinking about the whole 1,300 m at once is demoralising; getting to the next bench is not. That, more than anything, is how you get up a steep climb.

Partway up, the thing that caught my eye was the cable line that carries supplies up to Kassen-goya. The hut is known for the cold watermelon it serves in summer, and seeing how it gets there makes that slice taste better. Chilled watermelon, after a couple of sweaty hours — it's one of the genuine pleasures of this climb.

How to make a steep climb easier

On a climb this steep the hardest thing isn't your legs, it's your breathing. What I concentrate on is the exhale.

In yoga you breathe in and out through the nose, but on a steep mountain climb it helps to think of blowing out a candle — pushing the air out through your mouth until it's gone. Empty the lungs properly and the next breath arrives deeper on its own, which makes a real difference where the air is thin.

The other gauge is pace. If you can still hold a conversation, you're within yourself. When sentences start breaking up, you're going too fast. Alongside that, shorten your stride below what feels natural: less work per step, and both legs and heart last much longer. Slow, small, and breathe all the way out. Repeat those three to yourself on the way up and the climb changes.

Enzanso, and Tsubakurodake

At the top of the long Kassen-One you break out onto the ridge, and there is Enzanso, one of the best-known mountain huts in the Northern Alps. It sits in a superb position right on the ridge and is loved for its food and the warmth of its staff. Staying a night, and being on Tsubakurodake in the clear air of evening and early morning, is the whole point of doing this over two days.

From the hut it's an out-and-back on pale sand and gravel to the summit of Tsubakurodake. Scattered across it is Komakusa, the alpine flower that has become the emblem of this mountain — the "queen of alpine plants," at its best in July and August. Then the granite starts producing shapes: Iruka-iwa (Dolphin Rock), Megane-iwa (Spectacles Rock), one after another. White sand, blue sky and strange rock — it looked like a postcard, and walking it was pure enjoyment.

Day 2: along the Omote-Ginza to Otenshodake

The next morning we headed south along the ridge for Otenshodake (2,922 m), the high point of this section. It's roughly three hours each way from Enzanso, as a rough guide. The Jonen range runs away to your right, the ridge toward Yarigatake opens up ahead, and the further you walk the deeper the range feels.

From the summit of Otenshodake the panorama of Yarigatake and the Hotaka peaks wraps right around you. Stronger walkers carry on along the Omote-Ginza to Yarigatake from here; we made Otenshodake our turning point, walked back toward Enzanso and dropped down the Kassen-One to Nakabusa Onsen. Not stretching the distance, and having time to sit with the view instead, is what makes this two-day version good.

Difficulty, kit and planning

• Fitness: the Kassen-One is over 1,300 m of climbing. Do some walking beforehand and arrive with your legs ready
• Altitude: at 2,900 m the air is noticeably thinner. Use the breathing above, keep the pace down, and if you get a headache or feel sick, treat it as altitude sickness and don't push on
• Hut bookings: Enzanso and the other ridge huts are busy in season. Book ahead, always
• Kit: the ridge is cold even in summer, so an insulating layer is essential. The sun is strong too — sun protection and plenty of water
• Timings are approximate: the times here are a guide only. Check current conditions and the forecast, and start early

Why I'd send you here first

The climb up the Kassen-One is genuinely hard, and every bit of it is repaid the moment you reach the ridge. White gravel underfoot, Komakusa scattered through it, granite in improbable shapes, and a night at Enzanso. Tsubakurodake to Otenshodake has very little dangerous rock and still delivers the full scale of the Northern Alps, which makes it close to ideal as a first ridge traverse.

What matters is arriving fit, planning with margin, and walking slow, small, and breathing all the way out. Get that right and you have two days you'll remember for a long time. Next summer, maybe this is where you take your first step onto a high Japanese ridge.

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