Colorado State University Extension in Chaffee and Park Counties conducted numerous outreach educational activities between 2007 and 2010. A follow-up evaluation was conducted to determine whether one outreach activity was more effective at encouraging individuals to test their homes for radon or to mitigate their homes. Participants in the face-to-face class reported an increase in knowledge about the hazards of radon gas exposure and the need to test homes/businesses on an individual basis. Based on these data, continued outreach education is warranted, a variety of outreach activities is necessary, and individual testing of homes and businesses is needed.