A 436-acre preserve located in northeast Collin County. The park features a 52-acre relic of the Blackland tall-grass prairie and provides magnificent views of the countryside, much like those viewed by early settlers more than 100 years ago. Covered pavilions with cook pits and restroom facilities are available.

Wildflowers on the prairie include Prairie Parsley, Wild Petunia, Indian Paintbrush, Winecup, Prairie Clover, Meadow Pinks, Purple Coneflower, Mexican Hat, Gay Feather, Azure Sage, Golden Rod and Asters.

Parkhill Prairie is open for day use only from sunrise to sundown.