The Park is characterised by four broad vegetation types that reflect variations in geology, topography and climate. These are subtropical rainforest, dry rainforest, wet sclerophyll and dry sclerophyll forest.

Subtropical rainforest occurs in the Park where rainfall is high and kraznozem soils are deep. This is generally on the plateaus or the protected eastern and southern slopes. There are two subtropical rainforest associations in the Park. The Black Booyong association is the dominant type of sub tropical rainforest. The Yellow Carrabeen association occurs as small stands in protected sites of high altitude.

Common canopy species of these rainforest types include the giant stinging tree, pigeonberry ash, incense cedar, giant water gum, brown beech, rosewood, native tamarind, and strangler fig.

Two types of dry rainforest occur in the Park. A hoop pine association occurs as small stands on the western slopes of Wallaby Creek on basalt soils and the eastern slopes on enriched sedimentary soils, and probably exists as a result of severe wildfires which occurred in 1915 and 1926 during periods of extreme drought. The second dry rainforest association is dominated by scaly myrtle, brush bloodwood and scrub wilga. This association exists on steep stony and dry slopes adjacent to dry sclerophyll forests.

Wet sclerophyll forest occurs in the Park adjacent to rainforest on soil derived from older sedimentary rock which has been enriched by the nearby basalts. These communities include brushbox, Dunn's white gum, Sydney blue gum - tallowwood association and white mahogany - red mahogany - grey ironbark - grey gum association.