Early interseeding cover crops into standing corn could be a good option for cattle raisers looking to graze cover crops in the fall. But there are things to think about—the species of cover crops to plant, timing, crop insurance—before deciding what’s best for your fields, a cover crop specialist said recently during a field day.

Karl Dallefeld, president of Prairie Creek Seed, said there’s a growing interest in farmers wanting to interseed their cover...