Tsubakuro-dake, known as Swallow Peak, is a 2,763 m summit in the Northern Alps reached from the Nakabusa Onsen trailhead in Azumino City, Nagano. The trailhead is accessed by taxi or shuttle from Hotaka station, and the round trip covers 14 km with roughly 1,000 m of elevation gain, typically completed as a two-day trip with an overnight stay at Enzanso mountain hut near the summit ridge. The lower trail climbs steadily through beech and conifer forest on a well-graded dirt path known locally as one of the better-maintained routes in the Northern Alps, with switchbacks easing the grade. Above the treeline near Gozengahara, the surface turns to exposed granite and scree, and the trail passes distinctive wind-eroded granite formations before reaching the ridge. The final approach to the summit involves some rock scrambling but no technical climbing. Water sources exist at intervals on the lower forested section but disappear above Gozengahara, so hikers should fill up before the treeline. Enzanso hut, perched just below the summit, offers meals, bedding, and emergency shelter, and reservations are strongly recommended in peak season. The summit itself offers panoramic views across the Northern Alps toward Yarigatake. Most hikers ascend on day one to the hut and summit at sunrise or sunset before descending on day two.
Trail facts
- Trail area
- Hotaka, Azumino City
- Best season
- July–October
What to bring
- Full hiking boot system
- Sleeping bag or hut rental (¥1,000/$7 USD)
- Trekking poles
- Headlamp
- Extra warm layer
- Emergency whistle and first aid kit
Location
Nakabusa Onsen trailhead, Azumino City, Nagano
36.4230, 137.7680 View on map
Highlights
- Panoramic Northern Alps ridge views from the 2,763 m summit
- Wind-eroded granite formations near Gozengahara
- Overnight stay at Enzanso mountain hut on the ridge
- Well-graded forest switchbacks from Nakabusa Onsen
Tips for visiting
- Reserve a bed at Enzanso hut in advance during July and August peak season
- Fill water bottles before Gozengahara, as sources disappear above the treeline
- Bring a headlamp for early sunrise summit attempts from the hut
- Pack an extra warm layer, as ridge temperatures drop sharply even in summer
When to visit
July through October, after snow clears from the upper ridge; early morning hut departures give the best chance of clear summit views before afternoon cloud.
Accessibility
The trail is a steep mountain route with forest switchbacks and exposed rock scrambling near the summit; it is not accessible to wheelchairs or strollers at any section.
Frequently asked questions
Can Tsubakuro-dake be hiked in a single day?
It is possible for very fit hikers, but most visitors stay overnight at Enzanso hut to enjoy sunrise views and reduce fatigue on the steep upper section.
Is a permit required?
No permit is required, but hikers should file a mountain hiking plan (tozan todoke) at the trailhead or online, as recommended throughout the Northern Alps.
What is Nakabusa Onsen known for?
It is a hot spring lodge at the trailhead where hikers can bathe before or after the climb.