The project was initiated after publication of “Alley Effect on Several Cotton Cultivars in Small Plot Research” by E.M. Holman and C.W. Bednarz, which reported if we were only interested in lint yield, end trimming was not necessary. Kansas State Univ. Cotton Variety Performance Trials report lint yield, fiber quality components and yield components and are spread over an area of nearly 30,000 miles-1. Resources dictate that we combine operations when possible. The objective was to determine at which stage of development small plots could be end trimmed without affecting yields, yield components or fiber quality. Studies were set up as randomized complete blocks with four replications with six treatments per replication. Plots were four 30” rows X 30'. End trimming treatments were at 1) emergence; 2) four leaf; 3) first flower; 4) first open boll; 5) 50-60% open boll or 6) at harvest. At harvest, the first 48” from each end of the plots, in 12” increments, of the two center rows per plot (the harvest rows) were hand harvested. Yield components (height, nodes, bolls) were recorded and the bolls were hand harvested to determine yields and fiber quality. The remainder of the plot was machine harvested with yield components also recorded.