Ningunsaw River Ecological Reserve was protected in 1975 to preserve an elevational sequence of biogeoclimatic zones in a transitional climate. Ningunsaw Park was established in 2001 as an extension of this sequence, protecting the lower elevation valley bottom. Designation of the park followed the recommendations of the Cassiar Iskut-Stikine Land and Resource Management Plan.
Ningunsaw Park lies within the asserted traditional territory of the Tahltan First Nation. The historic Telegraph Trail passes through the park and was used from 1899 to the mid-1940s.
Ningunsaw Park is within the Northern Skeena Mountains Ecosection and, along with Ningunsaw Ecological Reserve, protects a complete elevational sequence of biogeoclimatic zones from ICH to ESSF to AT. The complete protected sequence of ecosystems provides an ideal setting for education and research.
High value grizzly bear habitat is found on avalanche chutes in the park. The wide range of ecosystems provides habitat for many mammals and birds.