Biological legacies (i.e., materials that persist following disturbance; “legacies”) shape ecosystem functioning and feedbacks to future disturbances, yet how legacies are driven by pre-disturbance ecosystem state and disturbance severity is poorly understood—especially in ecosystems influenced by infrequent and severe disturbances. Focusing on wet temperate forests as an archetype of these ecosystems, we characterized live and dead aboveground biomass 2–5 years post-fire in western Washington and northwestern Oregon, USA, to ask: How do pre-fire stand age and burn severity drive variability in initial post-fire legacies, specifically aboveground biomass carbon and fuel profiles? …Our findings demonstrate the importance of pre-disturbance ecosystem state in dictating many aspects of initial post-disturbance structure and function, with important implications for managing post-fire recovery trajectories in some of Earth’s most productive and high-biomass forests.