The five ancient trees are primarily Taiwan red cypress (Chamaecyparis formosensis), a species endemic to the island.
The trail sits within a persistent cloud forest belt, leading to frequent fog cover that supports high humidity.
These trees survived the extensive logging operations that occurred in Taiwan during the early 20th century.
The area is a significant habitat for the Mikado pheasant, a species endemic to high-altitude Taiwanese mountains.
The Hiyama Giant Tree Trail, located within the Xue-Ba National Forest Recreation Area, features five ancient Taiwan red cypresses ranging from 1,000 to 2,000 years old. The trail spans approximately 2.8 kilometers in a loop, showcasing old-growth coniferous forest ecosystems at an altitude of roughly 2,100 to 2,300 meters. Visitors traverse misty, high-altitude terrain characterized by damp, moss-covered ground and dense canopy cover. The trail functions as part of the broader conservation network within the Miaoli mountain range. It offers a temperate microclimate distinct from the subtropical lowlands of Taiwan. Access to the trailhead requires navigating the forest road system leading to the Guanwu area.
The base of the largest tree (Tree No. 5), which offers the most impressive perspective of the ancient trunk diameter.
Wear layered clothing to account for rapid temperature drops in high-altitude mountain forests.
Bring waterproof hiking boots as the forest floor remains constantly damp and slippery.
Carry a light rain jacket or poncho, as the mountain region is prone to sudden afternoon mist and precipitation.
Attempting the hike late in the day when visibility drops significantly due to mountain fog.
The area may be temporarily inaccessible during typhoons or significant seismic events; check forest service updates before traveling.
Stay on marked trails to protect the fragile root systems of the giant trees; maintain silence to observe wildlife; leave no trace.
