The National Register Statement of Significance reads:

On this site stand the ruins of Wolf House (1913) and the House of Happy Walls (1919), as well as the graves of John Griffith London and his wife, Charmian. "Jack" London (1876-1916), the most popular novelist and short story writer of his day, wrote passionately and prolifically, drawing from his first-hand experience at sea or in Alaska or in the fields and factories of California; between 1900 and 1916 he completed 51 books, hundreds of short stories, and numerous articles on a wide range of topics.

The Jack London Ranch is also California Landmark 743.