7 pages, Use of cover cropping systems has multiple benefits for agriculture. To convince vegetable growers to adopt such systems, we applied a field demonstration in which we grew selected cover crops during the off-season and then tomatoes. We focused on implementation of a science-based demonstration design and attended to the usefulness of the demonstration and audience timing preferences. As a result, growers grasped the advantages of growing cover crops and, consequently, have extensively adopted cover cropping systems, thereby applying a critically important practice for crop management and agricultural sustainability. Our method and findings can help Extension educators better implement programs to convince agricultural producers to adopt desirable farming practices that improve sustainable agriculture.