Discounts and premiums for wheat quality factors at a specific location can be affected by the quality of wheat at other locations. We estimate the effects of protein and test weight levels of Kansas hard red winter and North Dakota dark northern spring wheat on the protein and test weight premiums of each other. Additionally, we determine the effect on premiums of protein and test weight and discounts of shrunken/broken and damaged kernels at different locations within each region from changes in wheat qualities at other locations within the same region. Results indicate that spatial competition was important for protein and test weight, both between the two wheat regions and within the same region.