A Cornell University-led trial has named the top cover crop varieties from testing conducted across 13 US sites, giving growers region-specific performance data as cover crop acres expand nationwide.

The trial, coordinated by Cornell, evaluated cover crop varieties at 13 locations spanning multiple US states. Researchers ranked varieties based on performance criteria measured at each site, producing a list of top performers that growers can use when selecting seed for fall planting.

Variety selection has become a cost-sensitive decision for row-crop producers. Cover crop seed represents a direct input expense — typically one of the largest line items in a cover crop budget alongside planting costs — and poorly adapted varieties can fail to establish, wasting both seed spend and the planting pass. Trial data that identifies which varieties perform under specific regional conditions allows growers to match seed purchases to their climate zone, soil type and termination timing rather than relying on generic recommendations.

The multi-site design carries weight because cover crop performance varies sharply by location. A winter-hardy variety suited to New York conditions may winterkill in the Plains, and a rapid-fall-biomass variety prized in the Corn Belt may underperform in colder northern zones. Testing across 13 sites captures that geographic spread, letting the rankings distinguish varieties with broad adaptation from those that excel only in narrower regions.

The results arrive as US cover crop planted area continues to grow, driven by state incentive programs, federal conservation cost-share funding through USDA's Natural Resources Conservation Service, and growing grower interest in erosion control, weed suppression and soil health. Demand for reliable variety data has risen in parallel, since incentive programs often require verified establishment success before payments are issued.

For seed suppliers and input retailers, the trial rankings also signal which varieties are likely to see stronger demand heading into the next planting window, information that affects seed availability and pricing in regions where top-ranked varieties are adapted.

Growers considering the rankings should note the distinction between trial performance and on-farm results. Trial plots are managed under research protocols, and local soil conditions, planting dates and weather can shift outcomes. The Cornell-led rankings provide a screened starting point for variety selection, with on-farm testing recommended before committing to large seed purchases.

The trial team is expected to continue variety evaluations across the site network in upcoming seasons, which would expand the dataset and refine the regional recommendations available to growers.