
Mount Asama Karuizawa
An active volcano offering dramatic lava fields, challenging hikes, and stunning mountain vistas in the upscale resort town of Karuizawa.
Highlights
Must-see attractions
Social
From TikTok & Reddit
Best Time
Flowers bloom, pleasant weather

Mount Asama Karuizawa
Best Time
Flowers bloom, pleasant weather
Highlights
Must-see attractions
An active volcano offering dramatic lava fields, challenging hikes, and stunning mountain vistas in the upscale resort town of Karuizawa.
"Very beautiful and magnificent place! Would come back next time to see it in summer."

🎒 Pack for All Weather
Conditions change fast! Bring layers, rain gear, and sturdy shoes for hiking.
🚗 Rent a Car
Easier access to trailheads and scenic spots from Karuizawa Station.

Highlights
Discover the most iconic attractions and experiences

Onioshidashi Park
Base of Mount Asama
A dramatic landscape of jagged black lava rocks formed by a 1783 eruption. Eerie and silent beauty.

Usui Pass Observation Deck
Karuizawa
Offers breathtaking panoramic views of the surrounding mountains and Mount Asama.

Mount Asama Summit Hike
Mount Asama
A challenging but rewarding trek with stunning alpine scenery and a temple at the peak.
Plans like a pro.
Thinks like you
Planning Your Visit
Check Volcanic Activity & Weather
Hiking Trail Realities
Best Times
Insider Tips
from TikTok, Instagram & Reddit
🎒 Pack for All Weather
Conditions change fast! Bring layers, rain gear, and sturdy shoes for hiking.
🚗 Rent a Car
Easier access to trailheads and scenic spots from Karuizawa Station.
⏰ Check Trail Status
The mountain can close due to volcanic activity or weather. Always verify before you go.
📸 Capture the Views
Great photo opportunities from observation decks and the summit.
Tips
from all over the internet
🎒 Pack for All Weather
Conditions change fast! Bring layers, rain gear, and sturdy shoes for hiking.
🚗 Rent a Car
Easier access to trailheads and scenic spots from Karuizawa Station.
⏰ Check Trail Status
The mountain can close due to volcanic activity or weather. Always verify before you go.
📸 Capture the Views
Great photo opportunities from observation decks and the summit.
☕️ Local Cafes & Resorts
Enjoy BBQ and spas at foothills villas or luxury resorts with volcano views.
What Travellers Say
Reviews Summary
Visitors praise Mount Asama for its magnificent and beautiful scenery, with many expressing a desire to return, especially in different seasons like summer for the flowers or winter for the snow. The unique lava fields of Onioshidashi Park are a highlight. However, some find the summit hike more challenging than expected and note that shops can be closed, impacting the overall experience.
"It was a nice visit to Mt. Asama. But there are a few precautions to keep in mind before visiting.
The hike to the summit is not 2 hours. It's more like 2.5 to 3.5 hours ranging in speed. You should come prepared for weather and consumptionary requirements. If you have vertigo, this is not for you, as there are quite a few tight shaves with sheer cliff edges.
The walk is going up one mountain, climbing across a long ridge, and then going straight up to the top of Mt. Asama, so it isn't a direct hike.
The mountain is closed right now as of late October, and it is very cloudy (sometimes) at the top, and it gets cold easily.
It was wonderful."
Gustav Alpsten
"Very beautiful and magnificent place! Would come back next time to see it in summer because of all the flowers. Still fantastic in winter with all the snow🩷"
Ksenia Cherkashina
"Passed by this lovely active volcano in January on the way to the snow monkey hot springs. Steam or smoke was coming out of it while it was snow topped. Would love to see it more closely one day."
Heather Nehl
What People Like
What People Dislike
Frequently Asked Questions
🚇 🗺️ Getting There
The easiest way is to take the Shinkansen (bullet train) from Tokyo to Karuizawa Station (approx. 1 hour). From Karuizawa, you can rent a car or take a bus to access different parts of Mount Asama and its surrounding attractions like Onioshidashi Park.
Yes, it's feasible as a day trip, especially if you rent a car. The train journey to Karuizawa is about an hour, and then you can explore the area. However, to fully enjoy the hikes and sights, an overnight stay is recommended.
Renting a car offers the most flexibility for exploring the various trailheads and scenic spots. Local buses are available but may have limited schedules.
Mount Asama straddles the border of Nagano and Gunma prefectures. You can access different areas from towns like Karuizawa (Nagano) or Tsumagoi (Gunma).
Yes, buses typically run from Karuizawa Station to Onioshidashi Park, taking around 40 minutes. It's advisable to check the latest bus schedules.
🎫 🎫 Tickets & Entry
Access to the general hiking trails and scenic areas around Mount Asama is usually free. However, specific attractions like Onioshidashi Park may have an entrance fee.
Hiking trails are generally accessible during daylight hours. However, they can be closed without notice due to volcanic activity or severe weather. Always check official advisories.
Yes, Onioshidashi Park typically has an entrance fee. It's recommended to check the official website or local tourism information for the most current pricing.
While not always advertised, local tour operators in Karuizawa may offer guided hikes or tours of the Asama region. Inquire at the Karuizawa tourist information center.
Yes, due to its active volcanic nature, access to Mount Asama can be restricted. Always check the Japan Meteorological Agency or local authorities for any warnings or closures.
🎫 🏞️ Onsite Experience
The hike to the summit is considered moderately difficult. It involves a long ridge walk and steep ascents, taking approximately 2.5 to 3.5 hours one way. Be prepared for uneven terrain and potential exposure.
Wear sturdy hiking boots with good grip. Bring layers of clothing as the temperature can drop significantly, especially at higher altitudes. Waterproof and windproof outer layers are also recommended.
Restroom facilities are typically available at the trailhead or base areas. Shops and restaurants are more common in towns like Karuizawa or at specific attractions like Onioshidashi Park. Some visitors noted shops being closed.
From the summit, you can expect panoramic views of the surrounding landscape, including the caldera, distant mountains, and on clear days, even the Kanto Plain. The views from observation decks like Usui Pass are also spectacular.
The summit hike is generally not recommended for very young children due to its difficulty and exposure. However, exploring areas like Onioshidashi Park or enjoying the views from observation decks can be suitable for families.
🍽️ 🍽️ Food & Dining
Dining options are plentiful in Karuizawa, offering everything from casual cafes to upscale restaurants. Some villas at the foothills offer BBQ experiences with premium meats.
There are no restaurants at the summit of Mount Asama. It's essential to carry sufficient food and water for your hike.
Yes, some resorts and villas in the Kitakaruizawa area offer BBQ experiences, often featuring high-quality Japanese meats.
Karuizawa offers a range of Japanese and international cuisine. You can find local specialties, as well as international dishes in its many restaurants and cafes.
While not always explicitly advertised, many restaurants in Karuizawa are accommodating and can prepare vegetarian or vegan dishes upon request. It's best to inquire directly with the establishment.
📸 📸 Photography
Onioshidashi Park offers dramatic lava formations, while Usui Pass Observation Deck provides sweeping mountain vistas. The summit itself offers incredible panoramic shots on clear days.
Sunrise and sunset can offer stunning light for photography, especially from observation points. Midday can be harsh, but the unique textures of Onioshidashi Park are photogenic anytime.
Drone usage may be restricted in national parks and around active volcanoes. It's crucial to check local regulations and obtain any necessary permits before flying a drone.
A wide-angle lens is great for capturing the vast landscapes and lava fields. A telephoto lens can be useful for distant mountain shots. Don't forget a sturdy tripod for low-light conditions or long exposures.
On clear days, you might see steam or smoke rising from the crater, which can be a dramatic photographic subject. However, safety is paramount, and you should never approach areas with active volcanic emissions.
For Different Travelers
Tailored advice for your travel style
👨👩👧 Families with Kids
🚶♀️ Hikers & Adventure Seekers
📸 Photographers
Deep Dives
In-depth insights and expert knowledge
Exploring Onioshidashi Park
Visitors often describe the park as a 'field of chaos born from fire, now wrapped in silence.' The sheer scale of the lava formations is impressive, and the contrast between the dark rock and the surrounding greenery (especially in summer) is striking. It's a relatively easy area to explore on foot, with well-maintained paths winding through the lava fields. Remember to wear comfortable shoes as the terrain can be uneven.
Hiking Mount Asama: What to Expect
Preparation is key for a successful and safe hike. Ensure you have appropriate footwear with good grip, as the paths can be rocky and uneven. Layering your clothing is essential, as temperatures can fluctuate dramatically with altitude and weather changes. Even in summer, it can get cold at the top, and wind can be a significant factor. Always check the weather forecast and volcanic activity status before setting out. The mountain can be closed without notice due to safety concerns. While there's a temple at the summit, amenities like shops or extensive facilities are limited on the trail itself, so carry plenty of water and snacks.
Karuizawa: A Mountain Resort Escape
Visitors can enjoy a variety of activities, from exploring the charming town center with its boutiques and cafes to indulging in outdoor pursuits. The Karuizawa Prince Hotel Ski Resort offers stunning views of the city and Mount Asama from its slopes. For those seeking relaxation, there are day-trip spas and opportunities to enjoy premium BBQ experiences. The area is also known for its connection to Japanese whisky, with opportunities to invest in casks from the legendary Karuizawa distillery.



Social
from TikTok, Instagram & Reddit