The highest peak north of Kantō
Mount Nikkō-Shirane stands on the border between Nikkō City in Tochigi Prefecture and Katashina Village in Gunma Prefecture. At 2,578 m (some listings give 2,579 m) it is the highest point of both prefectures and of the whole Kantō region. Japanese sources usually call it the highest mountain "north of Kantō" (関東以北): every higher summit in Japan lies in the Chūbu region to the south-west, so it is also the highest peak in Japan outside Chūbu. Its topographic prominence is about 1,613 m.
The name Shirane, "white root" or "white peak", describes a mountain whitened by snow. Several Japanese mountains share it, among them Kusatsu-Shirane in Gunma and the Shirane group of the Southern Alps, so this one carries the prefix Nikkō. The national topographic map labels it simply 白根山. The summit dome itself is called Okushirane, "inner Shirane", to tell it from Mae-Shirane (2,373 m), "front Shirane", one of the older peaks around it. In 1964 Fukada Kyūya included the mountain in his book 100 Famous Japanese Mountains.
A young volcano
Nikkō-Shirane is the north-western end of the Nikkō volcanic group. Its activity began about 20,000 years ago from three vents: at the summit, near Zazen-yama (2,317 m) and near Chinoike Jigoku, and it built the mountain from thick lava flows and lava domes. The summit is a dome of andesite lava set in a ring of older peaks: Mae-Shirane, Goshiki-yama (2,379 m) and Zazen-yama. Between them lies the crater basin of Goshiki-numa, the "five-coloured pond", whose water looks emerald green from the summit. The last magmatic eruption was about 2,400 years ago; everything since has been steam-driven (phreatic).
The historical record is short but lively:
- 1649: ash fall and a new summit crater about 200 m wide and 10 m deep; the shrine on the summit was destroyed;
- 14 May 1872: a probable steam eruption on the south-west flank, leaving a crater more than 200 m across;
- 12 March 1873 and 4 December 1889: probable steam eruptions with ash fall, the second from an old crater on the west slope;
- July–September 1952: fumes and rumbling, probably a small steam eruption, the last recorded;
- 1993–1995, 2001 and after the 2011 Tōhoku earthquake: swarms of small earthquakes, some directly below the summit.
The Japan Meteorological Agency watches the volcano around the clock and rates it on its five-step volcanic alert scale. As of November 2026 it is at Level 1 ("potential for increased activity", meaning an active volcano with no restrictions), and the JMA's monthly reports for the summer of 2026 described the activity as quiet, with no sign of an eruption. Levels can change at short notice: check the JMA's current information before you go. In winter a magmatic eruption could melt snow and send a mudflow down the valleys.
Where it is and how to get there
The mountain rises in the heart of Nikkō National Park (established in 1934), west of the lake Yunoko and the moor of Senjōgahara, with the lakes Marunuma, Sugenuma and Ōjiri-numa on its Gunma side. National Route 120 crosses the ridge just north of it through the Konsei Tunnel, linking Nikkō with Numata. There are four common starting points.
Marunuma Kōgen and the Nikkō-Shirane Ropeway (Gunma side). By car it is about 50 minutes from the Numata interchange of the Kan-etsu Expressway, or about an hour from the Kiyotaki interchange of the Nikkō-Utsunomiya Road over the Konsei Pass. Parking at the resort is free and open 24 hours. By public transport, take a Kan-etsu Kōtsū bus from JR Numata Station or from Jōmō-Kōgen Station on the Jōetsu Shinkansen to the Kamata stop, then change to the bus towards Yumoto Onsen and get off at the Nikkō Shirane Ropeway stop. The Kamata–Yumoto leg runs only on weekends and public holidays; on weekdays the resort suggests booking a taxi.
Sugenuma trailhead (Gunma side). On Route 120 between Marunuma and the Konsei Tunnel, by the lake Sugenuma, with a paid car park.
Yumoto Onsen (Tochigi side). The hot-spring village at the end of Tōbu bus routes from Nikkō and Tōbu-Nikkō stations, past Lake Chūzenji. The longest and most demanding approach starts here.
Konsei Pass (Tochigi–Gunma border). A trail from the road near the Konsei Tunnel climbs over Konsei-zan (2,242 m) and Goshiki-yama.
In winter the Konsei road is not an option: Route 120 between Yumoto Onsen and the ropeway base station is closed by snow, roughly from December until late April, and drivers from Nikkō must make a long detour. The Sugenuma trailhead lies inside the closed section.
Routes to the summit
From the ropeway (the easiest). The Nikkō-Shirane Ropeway is 2,500 m long and climbs 600 m in about 15 minutes, in eight-seat gondolas, to a summit station at about 2,000 m. The trail leaves through subalpine forest, passes the junction of Shichiirodaira, where an emergency shelter stands, and then climbs the volcanic cone. The upper part is steep scree and blocks of lava with some hand-on-rock moments; the summit is a cluster of rock pinnacles with a small shrine. The ascent from the station is about 580 m. The resort gives these walking times without breaks:
- summit and back by the same trail: about 5 hours;
- up the Shirane trail and down over Zazen-yama: about 5 h 30 min;
- a loop over the summit, down to Goshiki-numa and back by the pond Yadaga-ike: about 6 h 30 min.
The last gondola down leaves at 16:30, so start early.
From Sugenuma via Yadaga-ike. A wide, gentle path becomes a steep climb through forest for about two hours, then opens at the pond Yadaga-ike, where the summit dome is reflected in calm weather. The trail crosses the saddle below Zazen-yama, joins the ropeway route and climbs the rocky dome. A popular loop descends the south-east side through scree to the Goshiki-numa shelter and the crater lake, and returns over a low saddle to Yadaga-ike. The climb is about 900 m; the loop takes about 7 hours of walking in standard guidebook times.
From Yumoto Onsen via Mae-Shirane. From the ski area above the village the trail climbs the steep Sotoyama ridge to the saddle below Sotoyama (2,204 m), continues by Tengudaira to Mae-Shirane, the first big viewpoint over Goshiki-numa and the summit dome, then drops to the Goshiki-numa shelter and climbs the dome from the east. It is a long, steep day with well over 1,000 m of ascent; count on 8–9 hours for the round trip. The trail is much quieter than the Gunma routes, and hikers have reported signs of bears.
From the Konsei Pass. A short, steep start with ladders leads to Konsei-zan and on over Goshiki-yama to Yadaga-ike and the summit. It is rougher and less used than the routes above.
Experienced winter climbers also use the east ridge (Tōryō), a mixed snow-and-rock line, and ski-mountaineers start from the Marunuma Kōgen ski area.
Huts, fees and rules
There are no staffed huts on the mountain. Two unstaffed emergency shelters stand on the routes: the Goshiki-numa shelter on the Tochigi side, about an hour below the summit at the junction to Mae-Shirane, and the Shichiirodaira shelter on the Gunma side. They are basic huts for emergencies and bad weather, with no meals, bedding or water, and the Goshiki-numa shelter has no toilet; most hikers climb the mountain as a day trip and stay in Marunuma or Yumoto Onsen.
Ropeway fares for the 2026 green season (4 June to 8 November 2026, according to the operator): adults ¥2,600 return (¥2,400 if bought online) and ¥2,000 one way; children ¥1,100 return and ¥700 one way. An afternoon return after 14:00 costs ¥1,300 for adults. Gondolas run from 8:00 (7:30 on a few autumn holiday dates), the last one up at 16:00 and the last one down at 16:30. Drones are banned in the resort grounds.
A climbing notification (登山届, tozan-todoke) is expected. On the Gunma side you can fill in a climber's card at the ropeway ticket counter or file a plan online with the Compass system, which is linked to the Gunma Prefectural Police.
When to go and weather
The regular hiking season runs from mid-May to the end of October. Snow patches can last into June, so early-season hikers should check conditions and may need light crampons. July and August bring flowers and the risk of afternoon thunderstorms; start early. Late September to mid-October is the most popular time, when the forests around the lakes turn, and the ropeway opens earlier on autumn holiday weekends to handle the crowds. In clear weather the view takes in Nantai-san and Lake Chūzenji, the Oze peaks Shibutsu-san and Hiuchi-ga-take.
Winter
From mid-December to the end of April the mountain is under deep snow, with the heaviest falls in February, and temperatures near the summit can fall to about −25 °C. In winter it is a mountaineering objective: crampons, an ice axe and winter clothing are essential, and the wind on the exposed dome is strong. Avalanche risk is concentrated in the steep gullies on the eastern side. Common starting points are the Yumoto ski area on the Tochigi side and the Marunuma Kōgen ski area, whose winter season usually runs from early December into early May. The Goshiki-numa shelter is the only refuge high on the mountain, and its door can be blocked by snow.
Water
There is no reliable water above the trailheads. The emergency shelters have no water supply, and the ponds of Goshiki-numa and Yadaga-ike should not be relied on for drinking. Fill up at Marunuma Kōgen, Yumoto Onsen or wherever you start, and carry at least 1.5–2 litres per person for the five-hour ropeway route and more for the longer climbs from Sugenuma or Yumoto, especially on hot summer days.
Mobile coverage and internet
Marunuma Kōgen and Yumoto Onsen have normal Japanese mobile coverage. On the mountain there is no published coverage map: on open ground near the summit a signal is often possible, but expect gaps in the forest and in hollows such as the Goshiki-numa basin. Download an offline map before you start. In an emergency call 110 (police, who handle mountain rescue) or 119 (fire and ambulance). A filed climbing plan helps the police find you.
Dangers and safety
The summit dome is the main hazard. Its steep scree and loose blocks of lava cause slips, and hikers above can knock stones down on those below, especially on the descent towards Goshiki-numa. The weather changes quickly at 2,500 m, and summer thunderstorms are dangerous on the exposed top. Asian black bears live in the forests of Oku-Nikkō; the Yumoto visitor centre posts recent sightings, and a bear bell is a good idea on the quieter routes. The resort recommends mountain insurance. Finally, it is an active volcano: check the JMA alert level before every trip.
Plants and the Shirane-aoi
Several plants are named after the mountain and were first described from it. The best known is the Shirane-aoi (Glaucidium palmatum), a large pale-violet flower found only in Japan. It is now rare in the wild here, and dead trees are common in the surrounding forests; one study has linked the damage to air pollution carried from the Tokyo area. In early summer the slopes still show tsuga-zakura, iwa-kagami and mine-zakura, and the alpine accentor lives among the summit rocks.
History and name
The mountain was a place of worship long before it was a hiking goal. From the Edo to the Meiji periods people on the Gunma side reportedly worshipped Okushirane as Arayama Gongen; no remains survive, but place names from the old pilgrimage are still on the map. Today a small Okushirane shrine stands on the summit, and the Mae-Shirane shrine stands on the top of Mae-Shirane. The 1649 eruption that destroyed the summit shrine is the first eruption of the volcano known from written records.
Interesting facts
- The 9th-century text once read as the first record of an eruption is now thought not to describe one, and an eruption long listed for 1625 turned out to be a mistake in the records.
- No large explosive (Plinian) eruption has been found in the volcano's history.
- A higher mountain at almost the same latitude, Yukikura-dake (2,611 m) in the Northern Alps, lies only about 430 m farther south.
- The Shirane-aoi, a flower found only in Japan, takes its name from this mountain.
FAQ
How high is Mount Nikkō-Shirane? 2,578 m (some sources give 2,579 m). It is the highest mountain in the Kantō region and in Japan north of Kantō, and the highest point of Tochigi and Gunma.
How long does the climb take? About 5 hours round trip from the top station of the ropeway, 6 h 30 min for the loop via Goshiki-numa and Yadaga-ike, about 7 hours for the Sugenuma loop and 8–9 hours from Yumoto Onsen.
How difficult is it? From the ropeway it is a moderate day hike with about 580 m of ascent, but the upper dome is steep, loose and rocky and needs proper boots and some care. The Yumoto route is long and strenuous. In winter it is a mountaineering climb.
How much does the ropeway cost? In 2026 an adult return ticket is ¥2,600 (¥2,400 online) and a one-way ticket ¥2,000; the green season runs from 4 June to 8 November 2026. Parking at Marunuma Kōgen is free.
Is there water on the way? No. The shelters have no water, so carry 1.5–2 litres or more from the trailhead.
Is there mobile coverage? Often on the summit dome and open ridges, but not reliably in the forest or basins. Call 110 for mountain rescue or 119 for fire and ambulance.
Is the volcano dangerous? It is active, but as of November 2026 it is at JMA alert Level 1, with no restrictions. Check the JMA's current alert level before you go.
When is the best time to go? Mid-May to the end of October, with late September to mid-October the favourite time for autumn colours. From December to April it is a winter climb.
Are there huts on Nikkō-Shirane? Only two unstaffed emergency shelters, at Goshiki-numa and Shichiirodaira. Most people climb it in a day and stay in Marunuma or Yumoto Onsen.