Johnson County Spans Three Distinct Natural Regions

Johnson County changes under your tires. The western half opens into rolling Grand Prairie. Near the middle, the Eastern Cross Timbers brings a rougher belt of post-oak savanna. Farther east, the ground turns to the deep, dark clay of the Blackland Prairie.

That shift helps explain why nearby pieces of land can feel unrelated. The Blackland's rich soil supported cotton and grain farming, while the wooded middle kept more of the Cross Timbers look. Across roughly 740 square miles, the county rises and falls from about 600 to 1,000 feet.