Okajima Kazuyoshi, one of Maeda Toshiie's retainers, was appointed castellan; however, faced with overwhelming odds, Sassa Narimasa surrendered Toyama after only a week, and Yasuda Castle was never used in battle.

Field headquarters such as Yasuda Castle normally disappear completely shortly after they are abandoned; however, due to the geography of the site, the outlines of the moats and clay ramparts were preserved.

[2] All of the structures of Yasuda Castle have long been lost and by the modern period, the moats had been filled in and much of the site was covered by rice paddy.

In the late 1960s, the site was targeted for redevelopment, and in 1977 to 1978, archaeologists found the outlines of the moats and ramparts, and confirmed that the layout matched that of a map which is preserved in the Kanazawa City Library.

From 1990 to 1994, the moats were restored and the site was opened as a public park with some excavated items on display at the nearby Yasuda Castle Ruins Museum (安田城跡資料館, Yasuda-jō ato shirokan).