The park contains one of the largest high-moor wetlands in Japan, characterized by unique peat-forming vegetation.
The name 'Tsugaike' refers to the proximity of the Tsuga (hemlock) forests that once surrounded the area.
Snow patches can persist in shaded areas of the park well into the mid-summer months.
The park's boardwalks are raised to allow for the natural migration of insects and small mammals beneath the pathways.
The endemic species 'Tsugaike-tou-hi' (Picea koyamae) is a rare spruce found in the region.
The landscape changes drastically from white snow-covered terrain in early June to vibrant autumn foliage in late September.
Tsugaike Nature Park is a high-altitude wetland sanctuary located at an elevation of approximately 1,900 meters in the Northern Japan Alps. The park features a 5.5-kilometer wooden boardwalk circuit that traverses diverse ecosystems, including alpine marshes, peat bogs, and meadows. It serves as a vital habitat for over 300 species of alpine flora, including the rare Asian skunk cabbage and Siberian dwarf pine. The reserve is positioned within the Chūbu-Sangaku National Park, offering views of the Hakuba mountain range peaks. The ecosystem is categorized into distinct zones, ranging from marshlands at the lower sections to rocky alpine terrain at the higher elevations. The site is accessible exclusively via the Tsugaike Ropeway system during the operational season. Visitors encounter significant temperature fluctuations due to the high-altitude climate compared to the valley floor. The trail system is designed to prevent soil erosion and protect the fragile alpine vegetation from human impact.
The Kusagawa Marsh area, which provides a reflection of the surrounding peaks in its calm waters.
Bring a windproof jacket even in summer, as weather conditions shift rapidly at 1,900 meters.
Apply sunscreen liberally; UV intensity is significantly higher at this elevation than at sea level.
Use the provided bathroom facilities before beginning the boardwalk loop, as there are no amenities on the trail itself.
Attempting to walk the trails in sandals or casual footwear; supportive hiking shoes are essential for the wooden planks.
Open only during the green season from early June through late October; closed for the winter season due to heavy snow accumulation.
Stay strictly on the wooden boardwalks to protect fragile alpine mosses and plants; remove all trash from the park.
