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Black-tailed jackrabbit diets and densities were compared between rangeland and cultivated areas in southern Idaho to determine how heavily jackrabbits rely on crops for spring and summer food. Jackrabbit densities were significantly higher near cultivated crops than on the isolated rangeland. Where barley and crested wheatgrass plants were available to jackrabbits, they were preferred foods and made up a large part of the spring and summer diet. As potato plants were not a highly preferred food, crop, damage by jackrabbits could probably be reduced by planting potatoes in a buffer strip between rangeland and preferred grain crops. Plant phenology was a major factor in determining food preferences of jackrabbits collected on rangeland. In the spring, 85% of rangeland diet consisted of grass. However, in early summer, grasses and forbs were eaten in equal amounts and by late summer, 71% of the diet was comprised of forbs and shrubs. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020