Community coalitions play an important role in community-wide strategies to promote health and wellbeing, and Extension professionals may provide leadership, technical assistance, and other support to coalitions. Extension professionals across a Midwestern state were invited to participate in an online survey about their coalition involvement and related training needs. The results of the study reported here describe the nature of Extension professionals' work within community coalitions; identify gaps in knowledge particularly related to policy, system, and environment change (PSEC) strategies; and point to professional development opportunities that will improve Extension's ability to work effectively within community coalitions.