Autumn colors at the edge of Circle Meadow along the Trail of the Sequoias / Circle Meadow Loop Trail. Sequoia National Park, est. 9/25/1890. 404,051 acres (1,635 km2). Giant sequoia forests are part of 202,430 acres (81,921 ha) of old-growth forests shared by Sequoia and Kings Canyon. National Parks. Tulare County, CA.