Established September 11, 1975. In 2008, Kalamalka Lake Protected Area (2,223 hectares) became part of Kalamalka Lake Park. The park now encompasses an area of 3,218 hectares.
The grasslands and bluffs of the park were traditionally used by the Okanagan Nation. Kekuli pits and six sites of lithic artifacts are located in the park along with evidence of small village clusters of pit houses and a larger cultural village. As well, Cosens Bay was the site of a World War Two mortar practice range.
Ponderosa pine and groves of Douglas fir are found in the northern portion of the Park, while Douglas fir, cedar and hemlock dominate the area south of Cosens Bay. To date, 432 varieties of vascular plants have been identified in the park, a rare find in such a small area. Included is the red-listed Flat-topped broom-rape. The grasslands above Cosens Bay are part of an ecosystem that is rapidly disappearing in the Okanagan Valley. Kalamalka Lake is one of a handful of unique bodies of water known as marl lakes. When the lake warms in summer, calcium carbonate, or limestone, forms crystals that reflect sunlight and create its distinctive blue and green colours.
There is an abundance of rare and endangered wildlife in this park. White-tailed deer, mule deer, mink, bobcat, black bear, cougar, coyote and red fox occur in the park. Blue-listed mammals include the Western harvest mouse and Townsend’s big-eared bat. A great spot for birdwatchers, the park provides habitat for the Canada goose, canyon wren, white-throated swift, Western screech owl and flammulated owl, all of which are blue-listed species. The variety of reptiles here is vast, including pacific rubber boa, western rattlesnake, western yellow-bellied racer, gopher snake, northeastern garter snake, common garter snake, western painted turtle, Great Basin spadefoot toad, and northern alligator lizard. There is even a unique insect, the green hairstreak.