Mt. Shibutsu — Oze's Wildflower Mountain, Serpentinite and Rare Alpine Flora

Trail Overview

Mt. Shibutsu (至仏山, Shibutsu-san) is a 2,228m peak in Katashina Village, Gunma Prefecture, rising on the western edge of Oze National Park across the Ozegahara wetlands from Mt. Hiuchigatake. It is Hyakumeizan #29 and is celebrated as one of Japan’s finest “flower mountains” (花の百名山).

The mountain’s unique geology — large outcrops of serpentinite (蛇紋岩) — creates an unusual soil chemistry that supports a community of rare and endemic alpine plants found almost nowhere else in Japan. The views down over Ozegahara toward Hiuchigatake are among the most iconic in the entire Oze region.

One-way traffic regulation: Descent toward Yamanohana (山ノ鼻) is prohibited to protect vegetation. Hikers must ascend from Hatomachi-toge and return the same way.

For international hikers: Oze can be reached by public bus from Numata Station (JR Joetsu Line). The area is well set up with trail signs in Japanese; some English signage exists at the main entry points.

Recommended Route: Hatomachi-toge Loop (via Ko-Shibutsu)

Ascending from Hatomachi-toge, passing Ko-Shibutsu, reaching the summit, and returning by the same ridge.

Course Time

Section	Duration
Hatomachi-toge → Ko-Shibutsu (小至仏山)	About 110 min
Ko-Shibutsu → Mt. Shibutsu Summit	About 40 min
Summit (rest)	About 30 min
Summit → Ko-Shibutsu	About 30 min
Ko-Shibutsu → Hatomachi-toge	About 80 min
Total (loop)	About 5 hours (including rest)

Tip: The 360-degree view from the summit takes in Ozegahara, Hiuchigatake, Mt. Tanigawa, and Mt. Hotakasan. An early morning start on a clear day maximizes your chances of seeing a sea of clouds over the wetland below.

Access Information

• Nearest Station: JR Joetsu Line, Numata Station
• From Tokyo: Joetsu Shinkansen to Jomo-Kogen Station (about 60 min), or JR Takasaki Line to Takasaki then JR Joetsu Line to Numata (total about 2 hours)
• Bus: From Numata Station or Jomo-Kogen Station, take a Kan-etsu Kotsu bus to Togura, then a shuttle bus to Hatomachi-toge (total about 120 min; seasonal service)
• By Car: About 60 min from Minakami IC on the Kan-etsu Expressway via Route 291 and Pref. Route 63 to Togura Parking. Private vehicles are restricted on the road to Hatomachi-toge during peak season; use the shuttle bus from Togura

Note: A shuttle bus fee is payable at Togura (Oshimizu Parking). This is separate from any bus ticket from Numata. Always check current schedules as service varies by year.

Convenience Stores, Shops & Restrooms

Convenience Stores

• Numata Station area: Several convenience stores (7-Eleven, Lawson, etc.). No convenience stores near Hatomachi-toge, so stock up in Numata
• Katashina Village: One convenience store in the village, about 40 min before the trailhead

Shops & Mountain Huts

• Hatomachi-toge Sanso (鳩待山荘): Mountain lodge at Hatomachi-toge. Light meals, drinks, and souvenirs available (May–October)
• Summit: No shops or water sources

Restrooms

• Hatomachi-toge: Public restrooms (donation requested)
• Below the summit: Carry-out toilet booth set up (bring a portable toilet)
• Yamanohana (Ozegahara entry): Public restrooms (if descending to the wetlands is permitted)

Highlights

Early Summer (June–July)

• Hakusan-ichige and other early alpine flowers bloom alongside remaining snow patches
• The contrast of Ozegahara skunk cabbage (June) with the white snowfields on Shibutsu above is iconic
• Trail quieter than later in summer — a good time for photography

Peak Summer (July–August)

• Hosobahina-usuyukisou (close relative of edelweiss) blooms along the serpentinite ridgeline — one of Japan’s rarest mountain flowers
• Ozeso (オゼソウ), takane-bara (タカネバラ), and chishima-gikyo (チシマギキョウ) add splashes of color
• Views of Ozegahara directly below are at their greenest

Autumn (Late September–October)

• The golden grasslands of Ozegahara and the ridge’s blazing foliage are best enjoyed together
• Clear autumn skies often bring exceptional long-distance views
• One of Japan’s most celebrated highland autumn scenes

Packing Checklist

• ✅ Waterproof hiking boots (high-grip soles are critical on serpentinite)
• ✅ Rain jacket and pants (weather in Oze changes rapidly)
• ✅ Warm mid-layer (summit is cool even in summer)
• ✅ Lunch and trail snacks
• ✅ Water (at least 1.5L)
• ✅ Trekking poles (very effective on wet serpentinite descent)
• ✅ Portable toilet
• ⬜ Bear bell (Oze is brown bear habitat)
• ⬜ Wildflower field guide (to identify the rare endemic species)