What is Onioshidashi Park?
Onioshidashi Park is a lava field formed by the eruption of Mount Asama located in northern Gunma Prefecture.
This unique landscape, created by volcanic rocks pushed out during the major eruption of Mount Asama in 1783, is known as a rare natural artwork in Japan.
The name comes from the legend that "it looks like a demon pushed out the rocks," and it offers a landscape reminiscent of another world.
As a unique tourist spot where you can feel the power of volcanic activity, it is popular among many travelers.
The Charm of Onioshidashi Park
1. Vast Lava Fields! Experience the Power of the Volcano
The biggest attraction of Onioshidashi Park is the endless expanse of black lava terrain.
Grass and flowers grow robustly between the rocks, showcasing the strength of nature.
① A World Apart! Dynamic Scenery
The rugged volcanic rock landscape is an unusual sight in Japan.
On clear days, you can enjoy the breathtaking view of beautiful Mount Asama in the distance.
② A Walking Trail That Takes About an Hour
Within Onioshidashi Park, there is a walking trail that takes about an hour to explore.
You can walk through the unique landscape created by the lava, with observation decks and historical buildings along the way.
2. Must-See Spots in Onioshidashi Park
① Asamayama Kannon Temple
In the center of the park stands Asamayama Kannon Temple.
- Built to console the souls of those who perished in the eruption of Mount Asama
- A valuable spot to feel the volcanic faith of Japan
② Lava Tunnel
You can walk among mysteriously shaped rocks and gaps in the lava created by volcanic activity.
- Passing through places where huge rocks pile up feels like a cave exploration!
③ Scenic Observation Deck
From the observation deck at the end of the walking trail,
- the majestic view of Mount Asama
- the town of Karuizawa and distant mountains
- can be seen.
3. The Seasonal Beauty of Onioshidashi Park
① Spring (April–June)
The fresh greenery is beautiful, making it the perfect season for a stroll!
Spring flowers begin to bloom between the volcanic rocks.
② Summer (July–September)
The cool highland breeze is pleasant, making it a recommended summer retreat!
The contrast between the blue sky and black lava is striking.
③ Autumn (October–November)
The autumn leaves are beautiful, creating a fantastic landscape with trees dyed in red and yellow contrasting against the black rocks.
④ Winter (December–March)
The snowy landscape of Onioshidashi Park is as beautiful as another world.
In the harsh cold, the snow covers the lava, highlighting the contrast of white and black.
4. Tourist Spots Around Onioshidashi Park
There are attractive tourist destinations scattered around Onioshidashi Park.
✅ Karuizawa (Nagano Prefecture): Popular as a stylish resort destination
✅ Kusatsu Onsen (Gunma Prefecture): One of Japan's top three hot springs! Exploring the hot spring town is also enjoyable
✅ The Cabbage Fields of Tsumagoi Village: One of Japan's leading cabbage production areas with vast landscapes
Useful Information for Travelers
Access Information (How to Get to Onioshidashi Park from Tokyo)
Access by Train + Bus
- Tokyo Station → Karuizawa Station (Hokuriku Shinkansen: About 1 hour 10 minutes)
- Karuizawa Station → Onioshidashi Park (Local bus: About 30 minutes)
Access by Car
- About 2 hours 30 minutes from Tokyo (via Kan-Etsu Expressway → Joshin-Etsu Expressway "Usui Karuizawa IC")
- Parking available (free)
Opening Hours and Admission Fees
- Opening Hours: 8:00–17:00 (varies by season)
- Admission Fee: Adults 500 yen / Children 300 yen
Wi-Fi Information
- Wi-Fi available within the park
- Note that there are areas with weak signal due to the mountainous location
Language Support
- Brochures available in English, Chinese, and Korean
- English support available at the tourist information center
Summary and Frequently Asked Questions
Onioshidashi Park is a mystical spot where you can feel the power of the volcano up close.
With its vast lava field landscape, Asamayama Kannon Temple, and beautiful seasonal scenery, it's an attractive destination with easy access from Tokyo!
A trip combined with a visit to Karuizawa or Kusatsu Onsen is also recommended.
Frequently Asked Questions
Q: How long does it take to tour Onioshidashi Park?
A: You can leisurely explore the park in about 1 to 1.5 hours.
Q: Can you visit Onioshidashi Park in winter?
A: Yes, it's open in winter, but you need warm clothing and easy-to-walk-in shoes due to snowy paths.
Q: Is food available?
A: There is a snack corner in the park where you can enjoy local Gunma delicacies.
Q: Is there an admission fee?
A: Yes, the admission fee is 500 yen for adults and 300 yen for children.
Q: Is Onioshidashi Park recommended for families or couples?
A: It's recommended for both families and couples, especially during the autumn foliage season or the snowy winter scenery, which is quite romantic.
Experience the grandeur of Japan's nature at Onioshidashi Park, and be sure to visit at least once!