Kajo Park — Yamagata Castle Ruins and Cherry Blossoms

Kajo Park occupies the site of Yamagata Castle, once one of the largest feudal castles in the Tohoku region. Built in the 14th century and expanded in the 16th century by the Mogami clan, the castle featured a massive five-layer network of moats and stone walls protecting the inner keep. The castle buildings were demolished during the Meiji Restoration, but the park preserves the moats, stone foundations, and earthwork fortifications. The main gate (Ote-mon) was reconstructed in 1991 using traditional Edo-period joinery techniques, providing a sense of the castle's original scale. The park is most famous for cherry blossoms — approximately 1,500 somei-yoshino cherry trees line the inner moat, creating a pink tunnel reflection in the water during peak bloom (mid-April). The park also hosts Yamagata's annual Hanagasa Festival staging area (early August), where thousands of dancers parade through the city wearing flower-decorated hats.