Mt. Hotakasan — Gunma's Hidden Peak, Chains, Legends and Solitude

Trail Overview

Mt. Hotakasan (武尊山, Hotakasan) is a 2,158m peak in Tone District, Gunma Prefecture, and Hyakumeizan #39. Known as “Joshu’s Hidden Peak” (上州の秘峰), it stands in the deep Oku-Tone mountains away from the more tourist-accessible summits of the area, making it one of the quietest Hyakumeizan in the Kanto–Joshin-etsu region.

The mountain’s name commemorates the legendary hero Yamato Takeru (日本武尊), and Hotaka Shrine at the base carries this legend. The main ridge connects several sub-peaks — Kengatamine (2,020m), Ie-no-kushi (2,103m), and the highest point, Oki-Hotaka (沖武尊, 2,158m). Chain-assisted scrambles add excitement, and the summit views encompass the Tanigawa Range, Oze peaks, and beyond.

For international hikers: Mt. Hotakasan is one of the more logistically challenging Hyakumeizan to reach by public transport. Planning ahead and considering a rental car or taxi is strongly recommended.

Recommended Route: Hotaka Shrine Out-and-Back (via Kengatamine Ridge)

The classic route starting from Hotaka Shrine, traversing the rocky Kengatamine ridge with its chain sections, and reaching the main summit.

Course Time

Section	Duration
Hotaka Shrine Parking → Trailhead	About 20 min
Trailhead → Teko-ya-zawa Emergency Hut	About 70 min
Teko-ya-zawa Hut → Kengatamine (2,020m)	About 60 min
Kengatamine → Ie-no-kushi (2,103m)	About 40 min
Ie-no-kushi → Oki-Hotaka Summit (2,158m)	About 30 min
Summit (rest)	About 30 min
Oki-Hotaka → Hotaka Shrine (descent)	About 3 hours
Total (out-and-back)	About 7.5 hours (including rest)

Tip: The rocky ridge and chains near Kengatamine are the crux of the route. Wet rock is extremely slippery, so avoid this section in rainy conditions. The Teko-ya-zawa emergency hut is unmanned but can be used as a last resort. Keep the chain sections slow and deliberate.

Alternative Route: Kawaba Campground (Ski Resort Side)

The Kawaba route from Kawaba Ski Resort is longer (about 8 hours round trip) but avoids the most exposed chain sections. Suited for hikers less comfortable with exposed scrambling.

Access Information

• Nearest Station: JR Joetsu Line, Numata Station
• From Tokyo: Joetsu Shinkansen to Jomo-Kogen Station (about 60 min), or JR Takasaki Line → JR Joetsu Line to Numata Station (total about 2 hours)
• Bus/Taxi: Very limited bus service to the trailheads from Numata. A taxi from Numata Station to Hotaka Shrine takes about 40 min (approx. ¥4,000–5,000). Pre-booked shared taxis are available in season — confirm in advance
• By Car: About 40 min from Minakami IC on the Kan-etsu Expressway via Route 291 and local roads to Hotaka Shrine. Free parking at Hotaka Shrine (about 20 spaces — arrive early on peak weekends)

Driving note: The road to Hotaka Shrine is narrow in sections. Take care on the approach. The Michi-no-Eki Kawaba (道の駅川場田園プラザ) is a good waypoint with food, restrooms, and local produce about 30 min before the trailhead.

Convenience Stores, Shops & Restrooms

Convenience Stores

• Numata Station area: Several convenience stores. No stores near Mt. Hotakasan — all food must be sourced in Numata
• Kawaba Village: Michi-no-Eki Kawaba sells bread, prepared foods, and local produce (open from morning; good pre-hike stop)

Shops & Facilities

• Michi-no-Eki Kawaba (道の駅川場田園プラザ): About 30 min before the trailhead. Restaurant, bakery, and local farm produce. Restrooms available
• Hotaka Shrine: Shrine office present; no shop
• On the mountain: Teko-ya-zawa emergency hut (unmanned). No shops anywhere on the route

Restrooms

• Hotaka Shrine Parking: Portable toilet available during hiking season
• On the trail: No restrooms (bring a portable toilet)
• Michi-no-Eki Kawaba: Clean public restrooms

Highlights

Summer (June–August)

• Views from the Kengatamine–Oki-Hotaka ridge: Tanigawa Range, Oze peaks, Nikko mountains
• Beech forest and clear mountain streams near the Teko-ya-zawa valley
• Very few other hikers — a rare chance for genuine mountain solitude on a Hyakumeizan

Autumn (Late September–October)

• The beech forest (ブナ林) turns vivid yellow-gold — classic Joshu (Gunma) mountain autumn scenery
• Ridge grasslands add warm tones above the treeline
• On clear autumn days, views can stretch as far as Yatsugatake and the Southern Alps

The Legend and the Quiet

• Walking the same ridgeline said to have guided Yamato Takeru — a mountain with historical depth
• Hotaka Shrine at the start sets an appropriately solemn tone
• The satisfaction of reaching a peak that takes genuine effort to access

Packing Checklist

• ✅ Waterproof hiking boots (high-cut; essential for rocky chain sections)
• ✅ Rain jacket and pants
• ✅ Warm mid-layer (ridge can be gusty)
• ✅ Lunch and trail snacks (no resupply on the mountain)
• ✅ Water (at least 1.5L)
• ✅ Headlamp (long day; allow buffer time)
• ✅ Work gloves or light gloves (chains are essential on this route)
• ✅ Portable toilet
• ⬜ Trekking poles (collapsible type recommended — stow them during chain sections)
• ⬜ Bear bell (Oku-Tone is brown bear habitat)