A considerable amount is known about the factors that influence policy adoption and implementation across different issue areas. Less is known, however, about the factors that influence governments to abandon programs or policies prior to reaching their stated objectives or originally specified end‐points. This article applies termination theory to local climate protection initiatives and examines cities’ withdrawal from the dominant sustainability organization facilitating these efforts. In the face of national government inaction, large numbers of U.S. municipalities voluntarily committed to reduce their greenhouse gas (GHG) emissions and joined the ICLEI's Climate Protection program. After steady membership increases for nearly a decade, ICLEI attained its largest size in 2010 with 565 city members. Over the next 2 years, this number plummeted by 20 percent. Positioned in the literature on policy change, we empirically test three hypotheses for why a substantial portion of cities ended their affiliation with this organization and terminated the explicit climate protection objectives associated with it: (1) political ideology and interest group pressure, (2) fiscal constraints, and (3) perceived program ineffectiveness. Analytical results support the first and third hypotheses. We identify factors that influence the termination of local GHG reduction initiatives and discuss theoretical implications of these findings.