Wheat area, production and yield levels in the United States have remained relatively stable during the past 40 or more years, with wheat prices reflecting most changes in area. Growth rate in wheat yield and in rate of production continues a slow but steady increase, characteristic of a mature market. Five classes of wheat are grown (Table 1.2) in four regions. Most US wheat is grown in the Great Plains from Texas to North Dakota. The area of wheat production during the period 1993-1995 (Table 1.1) was about 25 million ha, with an annual production averaging 62.6 million tonnes. Average yield for the period was 2.5 tonnes/ha.