Graupel-graupel and graupel-snowflake collisions experiments were carried out in still air conditions in the cold room of the Wind tunnel laboratory of the Johannes Gutenberg University, Mainz. Graupel particles were first exposed to supersaturated air conditions, under which dendritic ice crystals have grown on their surface. All fragments resulting from graupel-graupel collisions were collected and investigated under a digital microscope. Fragments resulting from graupel-snowflake collisions were observed and recorded instantly after collision using a holographic instrument. Number, size, area, and aspect ratio distributions of fragments were derived. These files contain data collected during the graupel-graupel and graupel-snowflake collisions. These data served for generating the figures in the publication. The files Graupel_graupel_number_CKE_mass_size.csv and Graupel_snowflake_CKE_mass_size give information on the experimental properties of the graupel-graupel and graupel-snowflake collisions, respectively. For these two files, the first column gives the name of the experiment (e.g. snow1). Each line is corresponding to one collision experiment. The concrete data for each collision experiment is provided in the data file having the corresponding name, e.g., snow_data1.csv contains the data of collision experiment snow1, etc. Readme_graupel_data.txt and Readme_snow_data.txt contain collision kinetic energies of graupel-graupel and graupel-snowflake collisions, respectively. Graupel_crystal_surface.csv gives the estimated number of crystal for defined bins (Fig. 12 dashed line) on the surface of the 2 mm graupel before the collision.