Soybean rust is caused by two fungal species: Phakopsora meibomiae and P. pachyrhizi, with the latter being considerably more aggressive than the former. P. meibomiae has only been found in the Western Hemisphere and it is not known to cause severe yield losses in soybean (Miles et al. 2003). For many years, P. pachyrhizi has impacted soybean production in Australia, Asia, Africa, and South America. Until November 2004, North America was the only major soybean growing region world wide that remained rust free. At that time, P. pachyrhizi was identified in Louisiana and by the end of the year had been found in nine states within the southeastern U.S. This paper uses web-based GIS and animation technologies to document the spatial and temporal spread of soybean rust to North America.