Mt. Hiuchi

Mt. Hiuchi (火打山, 2,462 m), in Myoko City, Niigata Prefecture, is one of the Kubiki Sanzan (Myoko, Hiuchi, Yakeyama) and the highest peak in Joshinetsu-kogen National Park, a 100 Famous Mountain of Japan (Kyūya Fukada’s selection).

The highlights are Tengu-no-niwa (Tengu’s Garden) — a high-altitude wetland of tarns just below the summit — and the great alpine-flower fields of Hakusan-kozakura (July) and Hakusan-shakunage, plus the habitat of rock ptarmigan (the only place outside the Japanese Alps). The standard route is an out-and-back from Sasagamine trailhead via Kōyaike Hut (1,990 m); the 2-summit traverse with neighbouring Mt. Myoko (2,454 m, also a 100 Famous Mountain) is popular. Difficulty: intermediate ★★★, ~9–10 h (day-hike for fit hikers or 1-night 2-day plan recommended).

*Timetable last checked: May 22, 2026

1. [Round trip] Myoko-kogen Station ⇔ Sasagamine (Keinan Bus Sasagamine direct, summer-only)

The only trailhead for Mt. Hiuchi, Sasagamine (1,300 m), is reached by Keinan Bus Sasagamine direct (Myoko-kogen Station → Imori-ike → Sasagamine-kogen) in about 50 min for ¥1,000 one way. Operates typically 12 July (mountain opening) – 26 October (2025 actual; 2026 to be confirmed), 2–8 runs per day depending on date. Sasagamine is the base for Mt. Hiuchi + Mt. Myoko traverse; parking (~150 spaces, free). Self-drive: ~17 km from Myoko-kogen IC.

Operating period : Typically 12 Jul – 26 Oct (mountain opening to autumn)
Travel time : Myoko-kogen Station → Sasagamine-kogen about 50 min
Fare : ¥1,000 (one way)
Frequency : 2–8 runs per day (varies by date)

Myoko-kogen Station → Sasagamine-kogen (Keinan Bus Sasagamine direct, summer-only, hiker excerpt)

Sasagamine-kogen → Myoko-kogen Station (Keinan Bus Sasagamine direct, return, summer-only)

Note : Operating periods and frequencies vary significantly — always confirm with Keinan Bus or Myoko Tourism. After the last bus (16:20), the only option is taxi (~¥10,000) to Myoko-kogen. Day-hiking requires the early bus (7:10); a ~10-hour round trip means a 17:00 descent, which won’t make the 16:20 last bus — one night at Kōyaike Hut is strongly recommended.

Reference : Niigata Tourism Sasagamine direct bus ｜ Keinan Bus official
Inquiries : Keinan Bus ☎0255-72-3139 / Myoko Tourism Bureau ☎0255-86-3911

2. Trail overview, Kōyaike Hut, suggested plans

About Mt. Hiuchi
The highest peak (2,462 m) of the Kubiki massif in southwest Niigata, within Joshinetsu-kogen National Park, one of the Kubiki Sanzan (Myoko, Hiuchi, Yakeyama). The Tengu-no-niwa at 2,000 m is a high-altitude wetland of tarns — peak season for Hakusan-kozakura (July), Hakusan-shakunage (July), Chinguruma and Watasuge. Famous as the only rock-ptarmigan habitat outside the Japanese Alps and for its precious high-altitude wetlands. Selected by Fukada as one of his 100 Famous Mountains.

Trail summary (only 1 main course)

• Sasagamine course (intermediate, ~9–10 h + Kōyaike overnight recommended): Sasagamine trailhead → Kurosawa Bridge → Jūni-magari → Fujimi-daira → Kōyaike Hut → Tengu-no-niwa → Raichō-daira → summit out-and-back
• Traverse with Mt. Myoko (advanced, 2 nights): Sasagamine → Kōyaike overnight → Hiuchi → Kōyaike → Chausu-yama → Myoko → Tsubame Onsen (descent)

Kōyaike Hut (2026 information)
– 1,990 m, ~3–4 h walk from Sasagamine trailhead
– Open: typically Jun – Oct (dorm-only in May)
– Reservation: required, ☎0255-78-7588 (9:00–17:00, Jun–Oct) or via Mont-bell online store
– Fee: ~¥10,500/night with 2 meals, dorm ~¥6,500 (varies by year)
– Bedding: provided (bring sheet)
– Water: tap at the hut, busy at peak
– Toilet: yes; tent site available (¥1,500/person)

Climbing season / flowers: June – October. July: peak bloom of Hakusan-kozakura at Tengu-no-niwa (mid-July), plus Hakusan-shakunage. Late September to early October brings autumn colours (Chausu-yama to Tengu-no-niwa is spectacular). Residual snow until late June.

Cautions
– Effectively no day-hike: ~10 h standard; the 16:20 last bus is not realistic — one Kōyaike Hut night is recommended
– Tengu-no-niwa tarns and wetlands: stay strictly on boardwalks
– Ptarmigan breeding season (Jun–Jul): pass quietly
– Bear sightings: carry bells

Emergency contacts and inquiries

• Myoko City Tourism Section: ☎0255-74-0021 / Myoko Tourism Bureau: ☎0255-86-3911
• Myoko Police (climbing plan, mountain rescue): ☎0255-72-0110
• Keinan Bus: ☎0255-72-3139 / Kōyaike Hut: ☎0255-78-7588 (9–17)

Suggested plans

• One night, Kōyaike overnight, Hiuchi out-and-back (recommended): Day 1 Myoko-kogen 11:10 → Sasagamine 12:00 → Kōyaike Hut 16:00 → dinner. Day 2 early 5:00 → Tengu-no-niwa → summit 7:30 → descend Kōyaike 9:30 → Sasagamine 13:00 → bus 13:20 → Myoko-kogen 14:10
• Two nights, Hiuchi + Myoko traverse (recommended): Day 1 Sasagamine → Kōyaike → afternoon Mt. Hiuchi out-and-back. Day 2 Kōyaike → Chausu-yama → Mt. Myoko → return to Kōyaike or descend Tsubame Onsen. Day 3 Kōyaike → Sasagamine descent → Myoko-kogen

Reference : Myoko Tourism Mt. Hiuchi trail guide ｜ Yama-to-Kogen Mt. Hiuchi autumn guide

Photo by Wikimedia Commons