As of April 2006, the site is managed directly by the Tokyo Metropolitan Park Association, an arrangement which ended in March 2011.

The castle ruins date from the Kamakura period (1185–1333), or earlier, and thus it is known that the site was in use, and regarded as strategically important, for many centuries.

The clan's destruction came largely at the hands of Ōta Dōkan, who was responsible for the construction of Edo castle; many of the ruins and shrines in the area are associated with him.

In the twentieth century, it came to be a popular site for birdwatching, strolling, and relaxation, and was formally established as a public park in 1959.

Rumiko Takahashi's Ranma ½ takes place in Nerima ward, and there are a number of episodes of the manga/anime in which the characters visit the park.