The park contains part of the World's only temperate inland rain forest. Steep, rugged mountains can be found in a warm, moist climate. A variety of plant and animal life is typical with stands of old-growth Western Redcedar and Western Hemlock, a forest type which is rapidly declining outside of protected areas. The park's inland rainforest also has an isolated population of banana slugs which marks the eastern boundary of their distribution in North America.
The park also protects a small herd of the threatened mountain caribou and provides habitat for grizzly bear and mountain goat. The Meadows-in-the-Sky Parkway is a paved mountain road open during the snow free months. The parkway begins in the rainforests of the park’s southwest corner, winds upward through the sub-alpine forests and ends in the rolling sub-alpine wildflower meadows. The Monashee Mountains rise to the west, with the Selkirk range to the east.