Stormwater runoff is a significant source of water pollution and a threat to the health of waterways across the country. Cold climates present unique challenges for stormwater managers. These challenges are addressed by a Cold Climate Stormwater Center of Excellence (CCSCoE), co-led by the University of New Hampshire (UNH) and the University of Minnesota (UMN) in partnership with the National Municipal Stormwater Alliance (NMSA). The Cold Climate SCoE program has three main initiatives: conducting research; providing technical assistance to state, Tribal, and local governments; and collaborating with the other National centers.