Located in the Hart Foothills ecosection, Gwillim Lake Park houses a diverse array of both coniferous and deciduous tree species. Lodgepole pine, white spruce, trembling aspen, paper birch and balsam poplar are found along the lakeshore intermixed with low wetlands of black spruce, willow and alder. Forests at higher elevations consist of Engelmann spruce and subalpine fir that open up into parklands and alpine meadows higher up.
The deep blue waters of Gwillim Lake are home to bull trout, mountain whitefish, lake trout, Arctic grayling, and northern pike. Due to low nutrient levels, the lake has a low regeneration capability for fish populations and is not able to sustain heavy fishing pressures. Please obey the catch limits posted in the B.C. Environment Fishing Regulations Synopsis.
If you are an early riser, you might get a glimpse of a moose or deer foraging for food. The wetlands at the east end of the lake attract a large variety of waterfowl and shorebirds and the park is home to a small population of bald eagles.