The Hakkōda Mountains (八甲田山系, Hakkōda-sankei) are an active volcanic complex in south-central Aomori Prefecture, Japan, in Towada-Hachimantai National Park.

The Northern Hakkōda Volcanic Group emerges from the rim of an 8-kilometer-wide (5.0 mi) caldera that dates back to the Pleistocene.

While the trails do not pose any technical climbing challenges, Hakkōda presents dangers such as volcanic gases, harsh winter weather, and avalanches.

The Hakkōda Mountains, along with Lake Towada and the Oirase Valley, make up the northern section of Towada-Hachimantai National Park.

[13] Two fatal incidents have happened in modern history due to volcanic gas emitted from the northern group.

[18] During the Jōmon period, human activity rapidly increased in the Hakkōda Mountains after a large-scale, Plinian eruption of the Lake Towada volcanic caldera.

It is hypothesized that the removal of the mountains' beech forest in the eruption made room for the chestnut groves that the Jōmon people in the area relied heavily on.

[23] On 3 August 1953, the national park was expanded, extending its protected status to the Tashiro Plateau Wetland in the caldera of the Northern Group of the Hakkōda Mountains.

The mountains offer an extensive area for backcountry winter and early spring recreation, with dry, powdery snow similar to what is seen at resorts in Hokkaido despite being slightly further south.

[31][32] Multiple ski resorts serve tourists near the bottom of the aerial lift and within close proximity of Sukayu Onsen.

[34] Climbing to the summit of Mount Ōdake, the highest peak of the Hakkōda Mountains, is not difficult and does not require any technical skill between May and November.

From Sukayu Onsen, it takes about two hours to complete the 694 meters (2,277 ft) ascent to the summit that is accessible by a well-marked pathway.

[35] From the top of the Hakkōda Ropeway it takes two hours to ascend to the summit and another two to descend back to the aerial lift.

[36] The summit can be reached outside of the mentioned climbing season; however dangers imposed by avalanches and harsh weather make advance training, personal radio beacons, and preparation necessary.

[38] A woman who was snowboarding in a backcountry skiing area 400 meters (1,300 ft) away from the Hakkōda Ropeway was killed as a result of another avalanche on 21 February 2021.

Located primarily to the south of Mount Ōdake, it stretches about half the distance from that peak across the southern Hakkōda Mountains to Lake Towada.

Its marshes and ponds support populations of Mandarin duck, forest green tree frog, and ruddy kingfisher.