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Forest biomass controls climate stability, many ecological processes and various ecosystem services. This study analyzes for the first time the recent changes (1987–2018) of forest above-ground live biomass (AGB) in Romania, based on a complex volume of remote sensing and forest inventory data that were modelled yearly using a series of sophisticated statistical algorithms. Subsequently, after modelling interannual AGB data, yearly raster values (~ 2 billion total pixel values) were explored as trends over the 32 years, using the Sen's slope estimator and Mann–Kendall test. A large volume of climate data was also processed in this study, in order to detect possible statistical relationships between climate and forest biomass, after 1987. Results showed a mean multiannual value of forest biomass of ~ 185 t/ha and a total AGB amount (stock) of about 1.25 billion tons (~ 1249 million tons or megatonnes/Mt …