Mount Adatara is a 1,728-meter active stratovolcano located in Fukushima Prefecture, Japan, forming part of the Adatara mountain range in the northern Bandai-Asahi National Park. The volcano has a recorded history of eruptions dating back to 1900, with its most recent significant activity occurring in 1996 and minor phreatic eruptions in 1997. The mountain's name derives from the Ainu language, reflecting the indigenous heritage of the region before Japanese settlement.
The volcanic landscape features several distinct peaks, with Minowakushi being the highest point at 1,728 meters. The mountain is renowned for its accessible crater area, Numanotaira, a marshland plateau situated at approximately 1,500 meters elevation that showcases active geothermal features including fumaroles and hot springs. The Kurogane-koya mountain hut near the crater provides one of Japan's rare opportunities to bathe in a natural volcanic hot spring at high altitude. The area's unique alpine ecosystem supports diverse flora, with particularly spectacular autumn foliage typically peaking in early October and alpine flowers blooming throughout summer.
Visitors can reach the upper slopes via the Adatara Kogen Ropeway, which operates from the base at approximately 950 meters to Yakushidake Station at 1,350 meters, significantly reducing hiking time. From the ropeway station, the summit can be reached in approximately one to one and a half hours of moderate hiking. Alternative hiking routes from the base take between three to four hours to reach the summit. Winter transforms Adatara into a ski destination, with the Adatara Kogen Ski Resort offering terrain suitable for various skill levels.
The mountain is accessible from Fukushima City, located approximately 30 kilometers northeast, with bus services connecting to the ropeway base station during operating seasons. Visitors traveling by car can reach the area via the Tohoku Expressway, exiting at Nihonmatsu IC. The ropeway typically charges around ¥1,650 for a round-trip ticket, though prices are subject to change. Due to volcanic activity, certain areas near active fumaroles may be restricted, and visitors should check current volcanic alert levels before planning their trip, as access regulations change based on geothermal activity.
