University campus trees provide valuable ecosystem services to the surrounding community while directly and indirectly supporting numerous United Nations Sustainable Development Goals. The purpose of this project was to develop a GIS-supported tree inventory, in conjunction with a service-learning course, to support Tree Campus USA initiatives and maintain a collection of woody plant materials on the Texas State University campus. Horticulture students in a Woody Plants course applied their expertise through use of the ArcGIS FieldMaps mobile app to record the tree inventory on campus. GPS functionality allowed students to digitally map tree location points that contained identification, size, health and maintenance recommendations for each tree. The data were made accessible for select specimen through mounted QR codes on the trees. While the benefits of urban vegetation have been widely studied, tree inventories can provide guidance to facility crews for appropriate planting and maintenance based on the needs of the local environment. Furthermore, the data obtained through a campus tree inventory provided a tool to support campus sustainability initiatives and information demonstrating the economic and environmental values campus trees provided.