This dataset presents data for "Legacy effects of experimental environmental change on soil micro-arthropod communities". The set contains data on soil micro-arthropods from an environmental experiment at Mount Sanddalsnuten near Finse, southern Norway. The dataset allows for analyses on soil micro-arthropod abundance and community structure and their response to environmental treatments: warming by Open Top Chamber, nutrient addition (NPK fertiliser), both of these treatments combined, and controls (ambient temperature, no fertiliser). Soil micro-arthropods were sampled in two years (2004 and 2016) which allows for assessment of any legacy effects of the treatments which were ceased in 2007. Between 2007 and 2016, the plots were subjected to different grazing regimes. Collembola were grouped as epi-edaphic (living on top of the soil), hemi-edaphic (living amongst the soil surface), and eu-edaphic (living deep within the soil).