The production of genetically modified (GM) maize offers the promise for improving maize yields in Kenya. However, a crucial question is whether GM maize can co-exist with local landraces. The risk of gene outflow between GM maize and a local variety on neighboring plots is of particular concern because of the costs it may impose directly on farmers and indirectly on consumers. Understanding the potential costs associated with introducing a Bt crop in the landscape requires knowledge of the spatial distribution of the existing crops and their evidence concerning the potential for spreading GM characteristics to local landraces. In order to contribute to addressing this issue, this study determined and quantified the dispersion of local open pollinated maize varieties in low land coastal Kenya. Our investigations find that maize fields are generally small in size on average dispersed uniformly throughout the landscape. While we continue to investigate the potential impact on gene flow and the security distance between fields, we infer that traceability of Bt genes will likely be a problem.