Mt. Nasu — Active Volcano and Autumn Color Spectacle

Trail Overview

Mt. Nasu (那須岳, Nasu-dake) is the collective name for the Nasu mountain range in northern Tochigi Prefecture, with the main peak Mt. Chausu (茶臼岳, 1,917m) designated as one of Japan’s Hyakumeizan (100 Famous Mountains). Mt. Chausu is an active volcano with visible fumaroles and the smell of sulfur near the summit, giving hikers a dramatic and otherworldly experience.

The Nasu Ropeway whisks you to the upper station at 1,684m, from which the summit is just 40 minutes away. A loop combining Mt. Chausu and the rugged Mt. Asahi (朝日岳, 1,896m) offers both volcanic landscapes and impressive rocky ridgelines.

Recommended Route: Mt. Chausu to Mt. Asahi Loop

Starting from the ropeway summit station, summit Mt. Chausu first, then traverse to Mt. Asahi via the Mine-no-Chaya col.

Course Time

Section	Duration
Ropeway Summit Station → Mt. Chausu	About 40 min
Mt. Chausu → Mine-no-Chaya Shelter	About 30 min
Mine-no-Chaya Shelter → Mt. Asahi	About 45 min
Mt. Asahi → Mine-no-Chaya Shelter	About 35 min
Mine-no-Chaya Shelter → Ropeway Summit Station	About 30 min
Total (loop)	About 4 hours

Caution: The Mine-no-Chaya area is a notorious wind corridor where strong gusts are common. Be prepared for sudden weather changes with proper windproof layers. The ridge to Mt. Asahi involves rocky terrain requiring careful footwork.

Mountain Hut Information

Mine-no-Chaya Shelter

• Type: Unmanned emergency shelter
• Open: Year-round
• Facilities: Emergency shelter space only. Useful as a wind break during storms on the ridge

Santogoyo Onsen

• Type: Staffed mountain lodge
• Open: Late April to late November
• Capacity: About 50 guests
• Highlight: A rare opportunity to enjoy a hot spring bath in the mountains. Advance reservation required

Access Information

• Nearest Station: JR Tohoku Main Line, Kuroiso Station
• From Tokyo: Tohoku Shinkansen to Nasu-Shiobara Station (about 75 min) → JR Tohoku Main Line to Kuroiso Station (about 10 min)
• Bus: Tono Bus from Kuroiso Station to Nasu Ropeway (about 60 min)
• Ropeway: Nasu Ropeway (about 4 min ride). Adults: one-way 950 yen, round trip 1,800 yen. May be suspended in strong winds
• By Car: About 40 min from Nasu IC on the Tohoku Expressway. Free parking at the ropeway base (about 190 spaces — fills up early during autumn foliage season)

Convenience Stores, Shops & Restrooms

Convenience Stores (within 5 min of trailhead)

• FamilyMart near Kuroiso Station: 2-minute walk from the station
• No convenience stores near the ropeway base station

Shops & Teahouses

• Ropeway Base Station: Shop selling beverages and souvenirs
• Ropeway Summit Station: Light meals and drinks available

Restrooms

• Ropeway Base Station: Full restroom facilities
• Ropeway Summit Station: Restrooms available
• Mine-no-Chaya area: Simple restroom near the shelter
• No restrooms on the Mt. Asahi route

Highlights

Summer (July–August)

• Alpine flowers bloom around Mt. Chausu
• Extend your trip with an overnight at Santogoyo Onsen for a mountain hot spring experience

Autumn (Late September–Mid-October)

• Nasu is celebrated for having one of Japan’s earliest autumn color displays
• Rowan trees and enkianthus turn the mountainside into a mosaic of red and orange
• The view of Mt. Chausu from Ubagadaira framed by autumn foliage is iconic

Packing Checklist

• ✅ Hiking boots suitable for rocky terrain
• ✅ Rain jacket and pants (doubles as windbreaker)
• ✅ Windproof warm layer (wind chill on the ridge is significant)
• ✅ Lunch and trail snacks
• ✅ Water (at least 1L)
• ✅ Gloves (for rocky sections)
• ✅ Hat and sunscreen (exposed ridge walking)
• ⬜ Helmet (during periods of heightened volcanic activity)