This study was designed to determine the effects of number of irrigations and plant population on earliness, lint yield and fiber properties of Fiber Max 819 cotton variety. Field evaluation was carried out, for the second consecutive year in 2001 at “La Laguna” Experiment Station at Matamoros, Coahuila, Mexico. The experimental design was a split-plot with three irrigation treatments as the main plots and four plant population treatments as the sub-plots. Earliness was measured as the percentage of crop harvested at the first picking (PCH-1). Lint yield (kg/ha) was determined by harvesting two center rows of each plot. A 20-boll sample of seedcotton was hand picked prior to harvest. Lint percentage, and fiber properties were determined from these samples. The value of PCH-1 of cotton irrigated once was the highest (74%). The highest lint cotton yield, independent of plant population; was obtained by the treatment with three irrigations. On the other hand, there were no significant differences in lint cotton yield among plant population treatments. The lowest fiber length value (27.3 mm) was obtained when Fiber Max 819 cotton variety was irrigated once. The highest fiber resistance value (91,000 pounds per square inch) was obtained for Fiber Max cotton variety with a population of 120,000 plants /ha. Fiber fineness was negatively affected when cotton was irrigated only one or two times.