Micronaire values provide an indication of mean fiber maturity and fineness. Theta, the degree of circularity has been used as a measure of fiber maturity. The distribution of theta values provides an indication of maturity uniformity. Early planting in Winnsboro,LA reduced micronaire levels but did not alter maturity distribution patterns.Early planting did not reduce micronaire levels in St. Joseph- grown cotton or maturity distribution patterns. Some varieties grown in Winnsboro and St. Joseph had the same micronaire value. St.Joseph-grown varieties with the same micronaire values as Winnsboro-grown varieties had different fiber maturity distributions. In addition to micronaire being an important fiber property. Fiber maturity distribution information is important for processing and dyeing.