Increasing frequency, size, and severity of wildfires in western North America threatens forest-dependent wildlife species. Pacific martens (Martes caurina) are associated with mature, structurally complex forests. Recently, we detected martens in forests burned at high-severity in the Dixie Fire, the largest recorded single fire in California’s history. We used non-invasive remote camera traps and hair snares (n = 166 stations) to assess marten density and home range composition using spatial capture-recapture models and occupancy using spatial occupancy models. We detected martens across the burn severity gradient (unburned to high-severity) at 98 of 166 (59%) camera stations. Individually identifiable martens’ home ranges spanned multiple burn severity classes and varied in their burn severity composition by individual. We found that marten occupancy is strongly associated with increasing shape complexity of patches burned at high severity on a large scale. We assess effects of spatial heterogeneity of burn severity and forest structural covariates at multiple scales on marten density. We detected multiple martens in burned areas between one and three years post-fire, providing evidence for use, survival, and short-term persistence of a rare forest-associated species within this megafire.