Warm season cover crops are not currently widely used in western Oregon, but they could be incorporated into crop rotations to serve a variety of purposes, including mitigating for an increasing possibility of longer summer droughts, increased heat stress, and restrictions on irrigation water availability. A two-year trial was initiated in 2017 at the USDA-NRCS Plant Materials Center in Corvallis, Oregon to evaluate the adaptation of 21 different warm season cover crop species or cultivars, both with and without supplemental irrigation.