The impacts of planted acreage, weather, nonirrigation, and prices on upland cotton lint yields were estimated for five climatic divisions in the major cotton producing areas of Mississippi, Texas, and California. A regression model was developed for each of the five divisions utilizing data from the 1972-88 crop years. The variables chosen to explain cotton yields differed among these divisions, and accounted for 78 to 93 percent of the variability in lint yields.