The goal of our study was to compare the morphology, survival and frequency of reproduction of Smooth snakes (Coronella austriaca) between The Netherlands and Norway. Individuals caught in the field were measured and identified using photographs. We here archive the raw measurements and individual encounter histories used in the analyses of Dalessi et al. (2021, Amphibia-Reptilia). Field observations were done in the Eindhoven area in The Netherlands (51°27′0″N, 5°28′0″E), and the Oslo area (59°54′41″N, 10°45′29″E) in Norway. In The Netherlands the study area consists of a number of remaining nature fragments of De Peel, a once large moorland area in the South-east of The Netherlands. Fragmentation is largely due to peat extraction and transformation of the former peat bog into farmland. De Peel is located across and along the border of the provinces Noord-Brabant and Limburg. Two large and a number of smaller geographical elements can be distinguished that still show most of the original natural conditions and features of a peat-bog moor. De Groote Peel (1500 ha; a national park) is one of these, the other is a combined area consisting of the Deurnsche Peel (1400 ha) and the adjacent Mariapeel (1400 ha). The vegetation in these sites is dominated by Purple moor-grass (Molinea caerulea). Other plants species that are mainly found are common heather (Calluna vulgaris), cross-leaved heath (Erica tetralix), small trees and different species of peat moss (Sphagnum spp.). In this study we included six locations within these two nature reserves: Groote Peel Yellow track, Groote Peel summer biotope, Groote Peel Noordoostpad, Mariapeel East, and in the Deurnsche Peel: Leegveld and Eikenlaan. In the South of Norway, Coronella austriaca is found mainly in a narrow area along the southwestern coastline. Typical habitat is more or less isolated open areas (surrounded by forest varying in density) with south-facing rocky slopes. Patches of small trees and shrubs are present in these areas and particularly crevices and parts ...