Mizugaki-yama (瑞牆山, 2,230 m) is one of Japan's most striking low-altitude hiking destinations — a granite peak whose slopes bristle with enormous rock towers, split boulders, and pinnacles that rise straight out of the forest canopy. The pale granite formations make the mountain look more like a fantasy landscape than an ordinary forested ridge, and the summit gives a dramatic close-up of these towers. It is a fine objective for hikers who want a genuine rocky scramble and exposed summit views without the altitude or commitment of a 3,000-metre peak.
Why Fukada Chose Mizugaki-yama
Mizugaki-yama is one of the hundred peaks in Kyuya Fukada's Nihon Hyakumeizan. Fukada did not rank the mountains; the book simply runs roughly north to south, so a peak's position in the sequence is geographic order, not a score. Fukada was drawn to Mizugaki's extraordinary landscape of granite towers and the contrast between the quiet forest of the lower approach and the bare, dramatic rock of the upper slopes — a geological spectacle as much as a hiking destination.
The Mountain
| Item | Detail |
|---|---|
| Elevation | 2,230 m (7,316 ft) |
| Prefecture | Yamanashi |
| Character | Granite tower landscape; forest below, exposed rock above |
| Hyakumeizan | Book order: roughly north-to-south, not a ranking |
| Elevation gain | ~720 m (trailhead to summit) |
| Typical season | Late April – November |
The Routes
Standard Route: Mizugaki Sanso → Fujimidaira → Summit
Grade: Moderate (with real rock scrambling near the top)
- Start: Mizugaki Sanso prefectural parking / bus terminus (~1,530 m)
- Elevation gain: ~720 m
- Time: about 5h30 round trip (roughly 3h30 up, 2h10 down)
The trail climbs through forest from the Mizugaki Sanso trailhead to Fujimidaira-goya (富士見平小屋), a hut and campsite with water reached in about 50 minutes. From there it continues to Momotaro Rock (桃太郎岩), a huge split granite boulder fitted with a wooden ladder, crosses the Amatori-gawa stream (天鳥川), then climbs a steep section secured with chains and ladders. Higher up, the route passes beneath Oyasuri Rock (大ヤスリ岩), the iconic granite tower, before a final scramble to the summit and its sweeping views — Kinpu-san stands to the east.
Alternate Route: Mizugaki-yama Nature Park / Fudo-taki Loop
Grade: Moderate
A quieter approach starts from the Mizugaki-yama Nature Park (みずがき山自然公園) on the northwest side, with parking at roughly 1,460–1,470 m. This route links to the Fudo-no-taki (不動滝) waterfall and offers a longer, less crowded line with fine views of the summit towers from below. The waterfall lies on this loop, not on the standard forest approach.
Getting There
By car (recommended): From the Chuo Expressway, exit at Sutama IC (須玉IC) and follow Prefectural Route 23, the Masutomi Radium Line, to the Mizugaki Sanso north parking area — about 35–40 minutes, with roughly 40 free spaces.
By public transport: Take the JR Chuo Main Line to Nirasaki Station, then the Yamanashi Kyohoku Kotsu bus bound for Mizugaki Sanso to the terminus (about 70 minutes). The bus runs seasonally with limited departures, so check the timetable before relying on it.
Winter note: The Masutomi Radium Line / forest road is closed in winter, roughly from late November to late April, and the bus does not run out of season.
Mountain Huts
Fujimidaira-goya (富士見平小屋): The on-trail hut and campsite, about 50 minutes above the Mizugaki Sanso trailhead, with water available. It is the natural base for an early summit start or for a two-day combination with neighbouring Kinpu-san.
Mizugaki Sanso (瑞牆山荘): A lodge at the main trailhead by the bus terminus and prefectural parking (~1,530 m), useful before or after the climb.
Flora and Wildlife
Asiatic black bears (ツキノワグマ): The Okuchichibu and Mizugaki range is Asiatic black bear habitat, with sightings reported from roughly late June into late November. The local authority advises carrying a bear bell or radio, and deterrent spray, and taking the usual precautions in bear country.
Rhododendron (shakunage, シャクナゲ): The mountain's signature flowering shrub, blooming roughly June to July. The best displays are along the Fudo-taki route.
Forest character: The lower slopes are mixed broadleaf forest — Mizunara oak, birch, and maple — giving way to conifer (komatsuga and shirabiso fir) higher up, with pale granite boulders scattered through the trees.
Rock climbers: Mizugaki's granite towers, Oyasuri Rock among them, are an important climbing area, so you will often share the lower mountain with climbers.
Seasonal Guide
Late April – May: Trail opens as the forest road reopens. Late snow can linger on the upper rock faces; fresh spring greenery below.
June – July: Rhododendron season, especially along the Fudo-taki route. Summer hiking gets busier on the summit approach.
October: Excellent autumn colour in the mixed forest below the granite line, the pale grey rock contrasting against orange and yellow.
Late November – April: Forest road and bus closed for winter; the upper rock faces may require crampons and serious winter experience.
Practical Tips for Foreign Visitors
Rock scrambling: The upper route involves genuine scrambling with hands and feet on granite slabs and blocks, aided by chains and ladders. Wear footwear with good grip and stow trekking poles for the upper section, where they get in the way.
Plan around the seasonal access: Because the forest road and bus close in winter and the bus runs infrequently even in season, confirm transport before your trip and consider driving from Sutama IC.
Combine with Kinpu-san: Mizugaki-yama and Kinpu-san are neighbouring peaks often linked over two days, with Fujimidaira-goya as the on-trail base.
Photography: The granite tower landscape is among the most photogenic in the region, especially from the summit looking back at the towers.
Frequently Asked Questions
Is Mizugaki-yama a day hike or an overnight?
It is comfortably a day hike. The standard route from the Mizugaki Sanso trailhead is about a 5h30 round trip (roughly 3h30 up, 2h10 down) with ~720 m of climb. Hikers who want an early summit start, or who plan to link it with neighbouring Kinpu-san over two days, use Fujimidaira-goya — the on-trail hut and campsite — as a base.
Can I reach Mizugaki-yama without a car?
Yes, but with care. Take the JR Chuo Main Line to Nirasaki Station, then the Yamanashi Kyohoku Kotsu bus bound for Mizugaki Sanso to the terminus (about 70 minutes). The bus runs seasonally with limited departures, so check the timetable before relying on it. Driving from Sutama IC via the Masutomi Radium Line (about 35–40 minutes) is the more reliable option.
When is the best season, and when does the snow clear?
The typical hiking season is late April to November. The trail opens once the forest road reopens around late April, though late snow can linger on the upper rock faces into May. June to July brings rhododendron (shakunage) bloom, and October offers excellent autumn colour. From late November to April the forest road and bus are closed and the upper rock faces may require crampons and serious winter experience.
Are there bears, and how should I prepare?
The Okuchichibu and Mizugaki range is Asiatic black bear (ツキノワグマ) habitat, with sightings reported from roughly late June into late November. The local authority advises carrying a bear bell or radio, and deterrent spray, and taking the usual precautions in bear country.
How hard is the climbing — is it suitable for beginners?
The route is moderate overall, but the upper section is genuine rock scrambling on granite slabs and blocks, aided by chains and ladders. Wear footwear with good grip and stow trekking poles for the upper section, where they get in the way. Because it helps to keep both hands free, it suits hikers comfortable with hands-on scrambling rather than complete beginners.
This guide is part of the Japan's 100 Famous Mountains: Complete Hyakumeizan Guide series.
