The collection consists of papers, clippings, and photographs relating to the life and activities of John S. Day. In addition to extensive correspondence, including with figures such as Lela Rogers and Ray Atkeson, the collection contains ledgers from Day’s Blue Moon Ranch; papers and plans relating to the construction of Day’s home at Gold Hill and his real estate development ventures; and papers relating to Day’s mountaineering and skiing careers. These papers include records from the Pacific Northwest Ski Association, the United States Ski Association, the United States Ski Educational Foundation, and the United States Ski Team.

Also of note are magazines, newspaper issues, and newspaper clippings, most of which include material written either by or about Day. Photographs in the collection include prints, negatives, and color positives. The images document Day's work at Crater Lake; the Blue Moon Ranch; celebrities visiting Day's planned Table Rock Estates; hunting trips in Oregon and Alaska; and ski trips.