Summer is a period of opportunity and concern when it comes to children and youth. However, a new report from the RAND Corporation commissioned by The Wallace Foundation shows that collaboration among community stakeholders can help identify and prioritize high-quality summer programming. The report, which focuses on the experiences of four cities, demonstrates that building successful summer networks requires a shared vision, strong leadership, coordinated action, funding for sustainability, and diagnostic data. The progress made and lessons learned in Boston, Dallas, Pittsburgh, and Washington, D.C. can serve as a roadmap for communities across the country.