Much research is being done to establish corn stover. Stover as an economical feedstock for ethanol and other industrial processes has many advantages including low cost, high production, and low competition. However; corn stover has disadvantages due mainly to its low density and heterogeneous make-up. Research was performed to evaluate and compare a hammermill versus a rollermill as two grinding methods to reduce particle size and change chemical distribution. The hammermill generated finer particles of a relatively homogenous nature, while the rollermill generated a broader particle size spread with differences in chemical composition for the different sizes. The rollermill created a 1% shift in lignin content, a 2% shift in ash content, an 8% shift in Hemicellulose content, and a 4% shift in cellulose content compared to the untreated control.