Conducting evaluations that are both valid and ethical is imperative for the support and sustainability of programs that address underserved and vulnerable populations. A key component is to have evaluators who are knowledgeable about relevant cultural issues and sensitive to population needs. Hispanics in rural settings are vulnerable for many reasons but especially because of language issues, differences in cultural beliefs and socioeconomic barriers. Additional factors, such as cultural proclivity to be deferential to authority figures and the possibility of having an undocumented alien status also are important issues for Hispanics living and working in rural communities. Because migrant farm workers comprise a large part of Hispanics living in rural areas, attention to the sensitive issues surrounding this population is paramount during program evaluations. This paper highlights ethical issues pertinent to program evaluations involving Hispanics residing in rural settings.