With many producers wanting to plant earlier and earlier, the use of polymer coatings has been questioned. Polymer coatings are designed to stay intact until a soil temperature of 55° F is reached, at which time water can penetrate the coating. Some have questioned whether coated seed is a "key" factor for early plantings to be successful. Does the addition of this coating help to extend the planting window even earlier? A comparison of polymer-coated and non-coated seed was included for each planting date study highlighted in the article, Has the best time to plant corn changed?.