Sky Rock Trail
Visit the great lava field.

The Sky Rock Trail is a trekking course through a protected natural area in the Joshinetsu national park on the north side of Mt. Asama. The solidified lava flows, volcanic rocks, crater, and tree forms left behind by Mt. Asama's eruptions, and the alpine flora, are recognized as an important natural heritage site by the Geopark organization.

Mt. Asama is one of the most active volcanoes in Japan. Despite 24-hour monitoring by the Meteorological Agency, eruptions are still difficult to predict. For safety reasons, on this trail you must be accompanied by a certified guide (reservation required 1 week in advance) and need to sign a consent form.

The total length of this course is 6 km, with a vertical difference of 300m. The course normally takes 3 to 4 hours for an adult to complete at a relaxed pace. There are some steep slopes, so please prepare appropriate clothing, shoes, and equipment for trekking. (see PDF file for details)


View point map of Sky Rock Trail is below.
※Open PDF file in new window.

Sky Rock Trail View Point Map

Opening dates

April 4th– November 30th (closed Wednesdays)
※Schedule of tours is on this calendar
※The tour will not run if there are fewer than 5 participants.

Opening hours

start 10:00am
back about15:00pm


Free Parking (Parking for 300 cars,40 buses)

Sky Rock Trail tour fee

※This money is used for environmental protection.

Classification Fee
Adult 1,000yen
Children (under 15 years old) 500yen
Infant (under 6 years old) Free

※Children under 10 years old must be accompanied by an adult.

About the tour

One or two certified guides will lead the trail.

Minimum group number: 5

Maximum group number: 15

※Reservations may become full at busy times.

※The schedule of our tour is on this Calendar.
※The trek may be canceled at the discretion of staff due to sudden changes in the weather or volcanic activity.

Sky Rock Trail: general guidance

Please check the link below for a list of emergency numbers and appropriate clothing, shoes, and equipment.
※PDF file opens in new window.

Sky Rock Trail: General Guidance

Inquiry, Reservation

Please make your reservation at least 1 week in advance.


Any questions, please contact us.


Fax Mail

Phone number

8:30am-5:00pm Closed Wednesdays



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