On sagebrush-grass ranges at the US. Sheep Experiment Station, Dubois, Idaho, heavy spring grazing caused rapid deterioration of good-condition range; production of palatable forage decreased, and sagebrush increased. Late fall grazing and complete protection maintained good range and improved poor range by increasing production of desirable forage and reducing sagebrush. Appropriately scheduled grazing improves range as effectively as costlier chemical and mechanical treatments.