Mt. Zao — Emerald Crater Lake and Snow Monsters of Tohoku

Trail Overview

Mt. Zao (蔵王山, Zao-san) is the highest peak of the Zao Range straddling Yamagata and Miyagi Prefectures. Its highest point, Kumanodake (1,841m), is one of Japan’s Hyakumeizan (100 Famous Mountains). The entire area forms part of the Zao Quasi-National Park, offering dramatically different experiences in each season.

The mountain is best known internationally for two phenomena: the Okama crater lake — a perfectly circular caldera filled with striking emerald-green water — and the winter juhyo (“snow monsters”) — bizarre ice-encrusted trees that form massive white sculptures along the ridge.

The Zao Ropeway provides easy access to 1,660m, making this one of the most accessible Hyakumeizan peaks. A pleasant half-day hike connects the summit and the Okama viewpoint, suitable for families and casual hikers.

For international visitors: The Zao Ropeway and resort facilities have English-language support. The Okama crater area near Karida-dake can also be reached by car or bus without hiking — ideal for those wanting to experience the scenery with minimal effort.

Recommended Route: Ropeway Summit Station → Kumanodake → Okama

Depart from the Jizo Summit Station (ropeway top), traverse to Mt. Kumanodake, then descend toward the Okama crater lake viewpoint at Karida-dake.

Course Time

Section	Duration
Jizo Summit Station → Mt. Jizo-dake	About 10 min
Mt. Jizo-dake → Kumanodake Emergency Shelter	About 40 min
Shelter → Kumanodake Summit	About 10 min
Kumanodake → Okama (Karida-dake)	About 30 min
Okama → Kumanodake → Jizo Summit Station (return)	About 60 min
Total round trip (incl. breaks)	About 3–4 hours

Tip: At Karida-dake, visit the Karidamine Jinja Shrine before stopping at the mountain rest house for a bowl of imo-ni (Yamagata’s famous taro stew) — a perfect post-hike meal with a mountain view.

Access Information

• Nearest Station: JR Yamagata Shinkansen / Ou Main Line, Yamagata Station
• From Tokyo: Yamagata Shinkansen (Tsubasa) direct to Yamagata Station — about 2 hours 40 minutes
• Bus: Yamagata Kotsu bus from Yamagata Station to Zao Onsen Bus Terminal — about 40 min. Then a 5-minute walk to the Zao Ropeway base station
• By Car: About 30 min from Yamagata Zao IC on the Yamagata Expressway. Paid parking available in Zao Onsen resort area

Convenience Stores, Shops & Restrooms

Convenience Stores

• Yamazaki Shop (Zao Onsen): Near the Zao Onsen Bus Terminal. Good for last-minute snacks and drinks
• 7-Eleven near Yamagata Zao IC: Convenient for drivers coming from the highway
• No convenience stores at the ropeway base — stock up in advance

Shops & Mountain Huts

• Zao Ropeway Stations: Souvenirs, light meals, and drinks sold at each station
• Kumanodake Emergency Shelter: Emergency use only — no food or supplies sold
• Karida Summit Rest House: At the Okama viewpoint. Serves light meals including imo-ni (taro stew), drinks, and Zao souvenirs

Restrooms

• Zao Ropeway Jizo Summit Station: Restrooms available
• Karida Summit Rest House: Flush toilets available
• No restrooms along the hiking trail between stations

Highlights

Spring (May–June)

• The Zao Echo Line snow corridor (giant walls of plowed snow lining the road) is one of Tohoku’s most dramatic spring sights
• Alpine flowers begin blooming from June

Summer (July–August)

• The Okama crater lake displays its most vivid emerald-green color in clear summer light
• Miyamakimbai (golden cinquefoil) and hakusan-furo (cranesbill) bloom along the summit ridge
• Cool highland breezes make this an excellent escape from lowland summer heat

Autumn (September–October)

• Grass tundra and low shrubs turn red and gold across the summit ridge
• The contrast of early snowfall on Kumanodake against the green Okama lake is stunning

Winter (January–March)

• Juhyo (“snow monsters”): Aomori fir trees encrusted in snow and ice create otherworldly white sculptures — Zao’s most iconic winter spectacle
• Peak juhyo season: late January to early March
• Night juhyo illumination tours are held on select evenings — a must-see winter experience
• Zao Onsen ski resort offers excellent skiing alongside the juhyo phenomenon

Packing Checklist

• ✅ Hiking boots (rocky ridgeline, strong winds)
• ✅ Rain jacket and pants (ridge is exposed to sudden weather changes)
• ✅ Packed lunch and trail snacks
• ✅ Water (minimum 1L)
• ✅ Warm layers (summit can be below 10°C even in summer)
• ⬜ Crampons and snow boots (winter)
• ⬜ Balaclava and goggles (winter wind protection)