Increased wildfire activity threatens the resilience of North American boreal forests by altering the composition, structure, and function of the ecosystem. Evidence suggests that boreal forest communities in burned areas are shifting, potentially altering ecosystem functions such as evapotranspiration (ET). This space-for-time study investigates trends in boreal forest composition (land cover), structure (aboveground biomass), and function (ET) during a three-decade period of regeneration following wildfire events. Results demonstrate that burned areas in North American boreal forests are generally undergoing successional trajectories toward deciduous and mixed forests. Rates of ET, while negatively impacted immediately after wildfire events rebound and surpass pre-fire levels after about 20 years. Trends in all variables are sensitive to wildfire severity. Across the study area (burned and unburned areas), ET was found to have increased at a rate of 2.42 mm per year from 2001-2020, with two-thirds of the increase attributable to changes in vegetation cover and characteristics.