Examination of the optimal design of rain gardens in road environments in Nordic climates, with a particular focus on suitable plant species and soil properties. The background is the increasing occurrence of extreme rainfall due to climate change, as well as the growing need for nature-based solutions to mitigate flooding. Despite the rising interest in rain gardens as a stormwater management solution, there is limited knowledge about which designs works best in road environments within Nordic climates. This dataset supports a thesis addressing this knowledge gap through field and case studies, particularly focusing on the first large-scale implementation of rain gardens in a street environment in Norway, at Bjørnstjerne Bjørnsons Street in Drammen. Additionally, supplementary investigations were conducted at Kanalveien in Bergen.