National health authorities uniformly express an urgent need for large-scale policies that incorporate population-based strategies to improve diet-related population health outcomes. On October 30, 2013, Washington State passed the first statewide comprehensive policy on food service guidelines (i.e., Executive Order 13-06: "Improving the Health and Productivity of State Employees and Access to Healthy Foods in State Facilities") aimed at improving diet-related health outcomes and estimated to impact 73,000 individuals. The aim of this study was to examine the facilitators and constraints to the development and passage of Executive Order 13-06 to inform future food service guideline development and passage in other agencies, states, and municipalities. We conducted 17 semi-structured telephone interviews with key stakeholders involved in the development and/or passage of Executive Order 13-06. Recorded interviews were transcribed verbatim, coded, and analyzed using the Advocacy Coalition Framework. Interviewees were from local and state public health departments, Washington State government, public agencies, academia, advocacy coalitions, and national organizations. Two main coalitions (proponents and opponents) diverged in their support of the passage of Executive Order 13-06. Proponents supported it given its potential to increase access to healthy food and beverage options. Opponents felt that it was not feasible to meet food service guidelines without affecting sales and profit. Study findings highlight the importance of early engagement with stakeholders most impacted by proposed food service guidelines, using existing guidelines rather than developing new guidelines, and creating a workgroup to discuss the feasibility of food service guideline implementation and compliance.