This multiple case study (Flyvbjerg, 2011; Stake, 2006) of three new rural high school libraries, located in two states in the U.S. Midwest, and the school communities they serve is part of a long-term research agenda grounded in a critical perspective (Anderson, 1989). The study is devoted to deepening the understanding of the relationships between teenagers' student peer culture, commonly perceived as intrinsically problematic in the U.S., and the contributions of informal learning environments and non-classroom spaces to school social climate (Voight & Nation, 2016). I found that school libraries are places prone to promoting positive school climates.