The castle was famously attacked twice by Tokugawa Ieyasu's forces, with the Sanada clan successfully defending it despite being vastly outnumbered.
The castle's original main keep was dismantled in the early Edo period to comply with the Tokugawa Shogunate's 'one castle per province' policy.
The iconic 'Sanada Well' in the Honmaru is rumored to have a secret tunnel leading to the castle outskirts, though this has never been archeologically confirmed.
Many of the stones used in the current castle walls are volcanic andesite, sourced from the nearby mountains.
The castle gates visible today are modern reconstructions based on historical records, as the originals were dismantled in the Meiji era.
Ueda Castle Ninomaru Ruins serve as the surviving defensive perimeter of the fortress established by Sanada Masayuki in 1583. The site is defined by its massive stone walls, dry moats, and reconstructed gate structures that reflect late-16th-century fortification design. During the Edo period, the site functioned as the administrative center for the Ueda Domain under the Matsudaira and Sengoku clans. The Ninomaru area connects the outer defenses to the Honmaru inner keep grounds. Visitors can observe original foundation stones and earthen ramparts that withstood historical sieges. The surrounding park preserves the layout of the former castle town, emphasizing the strategic geography used by the Sanada clan. The ruins are currently integrated into Ueda Castle Park, which hosts cherry blossom festivities annually.
The view of the East Gate (Higashi-Komon) framed by cherry blossoms or autumn maples.
Visit during the Ueda Castle Cherry Blossom Festival in mid-April to see over 1,000 blooming trees.
Walk the perimeter of the dry moat to better appreciate the scale of the original defensive engineering.
Look for the local museum located within the park grounds to view authentic Sanada clan armor and historical documents.
Do not assume all current buildings are original 16th-century structures, as most were reconstructed in the 20th century.
Park grounds are open year-round, but specific exhibition buildings within the site may close during the New Year holiday period.
Stay on marked paths to preserve the earthen ramparts; do not climb on the stone walls.
