Education outside the classroom becomes more relevant and connects school contents with real world problems. Especially the combination of outdoor education with digital tools allows new dimensions of mobility which outdoor education asks for and seems contemporary. This volume contains the papers presented at the “Research on Outdoor STEM Education in the digital Age” (ROSETA) Online Conference, held in June 2020. The proceedings summarize and connect theoretical considerations, practical experiences and ideas, as well as empirical research results for outdoor education with digital tools. The papers’ focus is on the STEM subjects Science, Technology, Engineering and Mathematics. The ROSETA conference and its proceedings are part of the project “Mobile Math Trails in Europe” which is co-founded by the European Union.