Minjary National Park is significant for providing a vegetated link between larger tracts of forest to the south and to the north west of Tumut. Minjary National Park contains significant intact remnants of South West Slopes forest and woodland communities and their associated fauna species, including White Box Grassy Woodland which has been identified as an Endangered Ecological Community under the Threatened Species Conservation Act, 1995.
Minjary National Park contains a number of Aboriginal sites and places. It was part of an Aboriginal travelling route between the Western Plains and the Kosciuszko area via the Tumut River, with permanent springs on the eastern side of the park providing a source of water. Later the area was used as a transport route between leases, and then as a State Forest in which controlled harvesting of timber and recreational use were allowed. The necessity to gain access across private property has, however, restricted use of the park.