The Barack Obama administration advanced open government initiatives to make federal administration more open, accountable, and responsive to citizens. Yet a question remains whether federal administrators took notice. This article examines changes in the extent to which U.S. federal agencies have integrated the three core principles of open government-transparency, public participation, and collaboration-into their performance planning. By analyzing 337 annual performance plans of 24 major federal agencies from fiscal years 2001 to 2016, the authors found that, overall, the level of integration of open government into performance planning has been trending higher since the early 2000s. During the Obama presidency, integration initially rose sharply but later declined. Findings also show that agencies' stated core values regarding open government are not consistently integrated into their performance plans. The implications of these findings for incorporating democratic-constitutional values into holistic performance management are considered. Evidence for Practice • U.S. federal agencies can, and do, incorporate democratic-constitutional values into their performance management schemes. • Agencies with open government values explicitly listed in their value statements are no more likely than other agencies to include open government in their performance plans. In other words, agencies' stated core values are not consistently integrated into their performance plans. • The declining level of integration of open government activities into performance planning may result in less attention, reduced investment of resources, and weaker efforts by federal agencies to foster more transparent, participatory, and collaborative governance. • It is important for agencies to incorporate democratic-constitutional values (which are not central to agency mission but are important governmental attributes in their own right) into performance planning. Models such as the GPRA Modernization Act may offer a starting point for balanced approaches.