For most Iowa lawns, the last mow before winter should leave the grass about 2.5 to 3 inches tall. That height is short enough to keep grass from matting under snow and long enough to protect the growing crowns through the cold. Time it for when the grass has basically stopped growing, which in Northeast Iowa is usually late October to mid-November. That's the short answer. If your lawn was hydroseeded this year, a few extra rules apply, so let's walk through them. Why the La