Global Range: (1000-5000 square km (about 400-2000 square miles)) This species occurs locally in the Gunnison Basin and southwestern Colorado, and in adjacent southeastern (San Juan County) Utah south and east of the Colorado River (AOU 2000, Beck et al. 2003, Schroeder et al. 2004, Gunnison Sage-grouse Rangewide Steering Committee 2005). The historical range is thought to have included southwestern Colorado, northwestern New Mexico, northeastern Arizona, and southeastern Utah (Schroeder et al. 2004). Gunnison Sage-grouse Rangewide Steering Committee (2005) includes a fairly detailed range map.
Schroeder et al. (2004) estimated that the current range is 4,787 square kilometers.