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Large-scale declines of grassland ecosystems in the conterminous United Stales since European settlement have led to substantial loss and fragmentation of lesser prairie-chicken Tympanuchus pallidicinctus) habitat and decreased their occupied range and population numbers by ~85%. Breeding season space use is an important component of lesser prairie-chicken conservation, because it could affect both local earning capacity and population dynamics. Previous estimates of breeding season space use are largely limited to one of the four currently occupied ecoregions, but potential extrinsic drivers of breeding space use, such as landscape fragmentation, vegetation structure and composition, and density of anthropogenic structures, can show large spatial variation. Moreover, habitat needs vary greatly among the lekking/prelaying, nesting, brood-rearing, and postbreeding stages of the breeding season, but space use by female lesser prairie-chickens during these stages remain relatively unclear. We tested whether home range area and daily displacement (the net distance between the first and last location of each day) of female lesser prairie-chickens varied among ecoregions and bleeding stages at four study sites in Kansas and Colorado, U.S.A., representing three of the four currently occupied ecoregions. We equipped females with very-high-frequency (YHF) or Global Positioning System (GPS) transmitters, and estimated home range area with kernel density estimators or biased random bridge models, respectively. Across all ecoregions, breeding season home range area averaged 190.4 ha ([+ or -]19.1 ha SE) for birds with VHF and 283.6 ha ([+ or -]23.1 ha) for birds with GPS transmitters, whereas daily displacement averaged 374.8 m ([+ or -]14.3 m). Average home range area and daily displacement of bird with GPS transmitters were greater in the Short-Grass Prairie/Conservation Reserve Program Mosaic and Sand Sagebrush Prairie Ecoregions compared to sites in the Mixed-Crass Prairie Kroregion. Home range area and daily displacement were greatest during lekking/prelaying and smallest during the brood-rearing stage, when female movements were restricted by mobility of chicks. Ecoregion- and breeding stage-specific estimates of space use by lesser prairie-chickens will help managers determine the spatial configuration of breeding stage-specific habitat on the landscape. Furthermore, ecoregion-and breeding stage-specific estimates are crucial when estimating the amount of breeding habitat needed for lesser prairie-chicken populations to persist., INTRODUCTION Since European settlement, grassland ecosystems in the conterminous United States have seen large-scale declines in their extent and quality (Samson and Knopf, 1994; Hoekstra et al, 2005; Augustine et [...]