Yato Castle, Historic castle ruins in Hokuto, Japan

Yato Castle is a medieval fortress site located on a ridge near Mount Yatsugatake at around 850 meters elevation. The ruins sit protected by steep cliffs and rivers on multiple sides, and excavations have uncovered many objects from when people lived and worked here.

The fortress was built during the Heian period and belonged to Henmi Kiyomitsu, an ancestor of the Takeda clan who died here in 1199. The castle was eventually abandoned as power shifted in the mountain region.

The name Yato means 'night place' and reflects the castle's remote mountain setting in local understanding. Visitors can see displayed artifacts that reveal daily life here, including imported ceramics and religious items that people used centuries ago.

The ruins are a 45-minute walk from Kai-Koizumi Station or a 60-minute walk from Nagasaka Station on the JR East Chūō Main Line. The route climbs to a ridge at about 850 m, so allow time for the ascent. The Yato Castle Furusato History Hall stands beside the site and displays the excavated artifacts.

The fortress features an unusual defensive layout with a large moat positioned inside the rampart rather than outside. This design choice sets it apart from typical castle fortifications of that era.