Long-term forest inventory and aboveground tree biomass data from LTER Zöbelboden Austria (1993-2019). The dataset contains the forest inventory parameter (tree species, tree vitality status, diameter at breast height, tree height) as well as stem, branch, foliage/needle and total aboveground biomass of the trees within the permanent inventory plots covering the LTER Zöbelboden. The forest inventories were conducted in 1993, 2005, 2010, 2014 and 2019.