Plant Materials Centers (PMCs) at 21 locations conducted a 2-year evaluation of 56 commercially available varieties of cereal rye, hairy vetch, crimson clover, red clover, winter/field pea, black oats, black seeded oats, and daikon radish to assess their adaptation and performance as cover crops throughout the continental United States. Information from the study will assist conservation planners and farmers in selecting varieties to better meet the cover crop objectives of their production systems.