Researchers are investigating the formation and development of community coalitions—from their initial mobilization and development of key structures and processes, to their implementation and sustainability. These findings shed light on the sustainability outcomes of community coalitions and the factors that impact sustainability. However, there is a dearth of empirical information on what happens to coalitions once they have formed, developed, and reached a sustained state of activity. Future research should explore whether there are different stages of coalition sustainability, how coalitions mature and evolve in each of these stages, and whether their characteristics and capacities change over time. Another area for future research is identifying funding models for coalition sustainability and the optimal length of funding. While sustainability is a process that occurs over time, funders and policy makers would benefit from more information about the optimal length of time to fund a coalition or program to achieve its goals. Finally, no single study can investigate every coalition characteristic or capacity that may affect sustainability. Future research should continue to explore different factors and conditions that foster community coalition sustainability.