Frost free days range from 230 to 270 days and elevation ranges from 200 to 950 feet. The Thornthwaite indices range from 30 to about 60. These include the Bosque , Bunyan , and Frio series. Bunyan soils do not have mollic epipedons. All of these series are in similar landscape postions.
Permeability is moderate.
Most of the soil is farmed to peanuts, sorghums, cotton, and pecan orchards. Areas that flood frequently are used mainly for bermudagrass pastures and pecan orchards. Scattered hackberry, elm, and pecan trees occur in most areas. The soil is mainly in the mixed post oak and prairie areas of central Texas and in adjoining areas of Oklahoma. The series is of moderate extent.