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This 170 km route runs from Fuefuki to Tsumagoi, passing through Yamanashi, Gunma, and Nagano. In the past 30 days, 45 bear sightings were reported within 5 km of the route. The past 7 days account for 7 of them. The latest sighting was reported 19 hours ago near Tsumagoi Ashiuda, Gunma.
This is an active bear corridor. Rerouting or rescheduling your hike is strongly advised.
5 places within 1 km of your route, passing through Yamanashi, Gunma, Nagano.
Tsumagoi Ashiuda, Gunma
Tsumagoi Ashiuda, Gunma
Size: Adult
Karuizawa 軽井沢, Nagano
親熊1頭、小熊1頭が道路を北から南へ横断していた。
Tsumagoi Kanbara, Gunma
Location: 36.36815° N, 138.59869° E We encountered 1 adult female bear with 2 cubs. The adult bear made a bluff charge toward us (stopped around 5 meters away) while the cubs ran up the hill. They then moved away together.
Karuizawa 中軽井沢, Nagano
Size: adult with cubs
Karuizawa 大字長倉, Nagano
Size: Adult
Karuizawa 軽井沢, Nagano
Size: Adult
Karuizawa 中軽井沢, Nagano
Naganohara Furumori, Gunma
Size: Adult (fully grown)
Karuizawa, Nagano
Size: Adult (fully grown)
Karuizawa 中軽井沢, Nagano
A resident living in the Kurosawa area of Takekawa Town reported that they appear in security camera footage. The person entered the yard from the Takekawayamataka Line 35 city road on the south side of their house and walked north through the yard.
Hokuto Mukawacho-Kurosawa, Yamanashi
Naganohara, Gunma
Around 1:00 PM on 2026-07-28, one bear was sighted in Karuizawa, Karuizawa Town, Nagano Prefecture.
Karuizawa 大字軽井沢, Nagano
万座亭別館
Tsumagoi, Gunma
On the way back from Kusatsu Onsen, a mother bear and two cubs were trying to cross the road. They were startled by an oncoming car and turned back into the woods. There is a 7-Eleven just ahead from where they appeared.
Kusatsu, Gunma
Size: juvenile
Karuizawa 大字長倉, Nagano
Size: Adult
Karuizawa 大字発地, Nagano
Around 8:20 on 2026-07-24, a bear was sighted in Nagakura, Karuizawa Town, Nagano Prefecture.
Karuizawa 中軽井沢, Nagano
Size: Adult
Karuizawa 大字長倉, Nagano
Nakanojō Namasu, Gunma
Naganohara Kitakaruizawa, Gunma
A bear was sighted in Mogusa, Karuizawa Town, Nagano Prefecture, around 7:15 a.m. on July 21.
Karuizawa 大字茂沢, Nagano
Size: Adult
Karuizawa 大字茂沢, Nagano
Size: Unknown
Karuizawa 大字長倉, Nagano
A bear was sighted in Karuizawa, Karuizawa Town, Nagano.
Karuizawa 大字軽井沢, Nagano
Size: cub (young bear)
Karuizawa 中軽井沢, Nagano
Size: Juvenile
Karuizawa 大字軽井沢, Nagano
Size: cub (young animal)
Karuizawa 大字軽井沢, Nagano
Size: Adult
Karuizawa 大字軽井沢, Nagano
Size: juvenile
Karuizawa 大字長倉, Nagano
Size: adult (fully grown)
Koumi, Nagano
Around 7:00 on July 16, a bear was sighted in Chiyosato, Koumi Town, Nagano Prefecture.
Koumi 大字千代里, Nagano
Naganohara, Gunma
Size: adult and cub
Karuizawa, Nagano
Size: juvenile
Karuizawa 大字軽井沢, Nagano
Fuefuki, Yamanashi
Naganohara Okuwa, Gunma
It looked like a large dog crossed the area, but there was no owner, and I realized it was a wild animal. It was not a boar, deer, or badger. Judging from the size, gait, and silhouette, I think it may have been a young Asiatic black bear (Ursus thibetanus), so I am reporting it. Also, while walking nearby I found a black, glossy, flattened droppings. After examining it, I believe it is likely from a bear.
Karuizawa 大字軽井沢, Nagano
A bear was sighted in Oguwa, Naganohara Town, Gunma Prefecture, on the morning of 2026-07-13.
Naganohara, Gunma
Koshu Katsunumacho-Kamiiwasaki, Yamanashi
Fuefuki, Yamanashi
Naganohara, Gunma
On 2026-07-10 in Shinkoda, Saku City, Nagano, a bear was sighted.
Saku Arakoda, Nagano
A bear was sighted around 7:00 AM in Kitakaruizawa, Naganohara Town.
Naganohara Kitakaruizawa, Gunma
Peak activity at 15:00 with 4 incidents
Ursus thibetanus japonicus
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For mountain rescue, call 110 (police). They will coordinate with local rescue teams.
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In the past 30 days, 45 bear sightings were reported within 5 km of the route. The past 7 days account for 7 of them.
The latest sighting was reported 19 hours ago near Tsumagoi Ashiuda, Gunma.
Recent sightings on this route peak around 15:00. Bears are generally most active at dawn and dusk.
This 170 km route runs from Fuefuki to Tsumagoi, passing through Yamanashi, Gunma, and Nagano. In the past 30 days, 45 bear sightings were reported within 5 km of the route. The past 7 days account for 7 of them. The latest sighting was reported 19 hours ago near Tsumagoi Ashiuda, Gunma. This is an active bear corridor. Rerouting or rescheduling your hike is strongly advised.
