Habitat quality for American martens (Martes americana ) has been associated with mature coniferous forests, complex forest structure, unharvested forests, and unfragmented landscapes, but the relative importance of these attributes are unclear. I used snow-tracking and track plate surveys to sample marten habitat use during the winters and summers of 2002 and 2003 in central Ontario. Summer habitat use was associated with reduced basal area at the stand scale, and patches of low canopy closure and mature and mixedwood forests at the landscape scales. During winter, habitat use was described by track abundances of prey species and relatively high basal area. Highly used winter landscapes included patches of high basal area and lacked mixedwood forests. Increased habitat use was unrelated to forest types at the stand scale and most aspects of silvicultural history, but changed seasonally in relation to forest structure, which has implications for the management of marten habitat.