Precision agriculture techniques have limited adoption in Texas cotton production, and a contributing factor is the lack of a reliable yield mapping system. Most of the commercial efforts for cotton yield mapping have been focused on cotton pickers. A yield mapping system that will work on cotton strippers is needed for Texas conditions. A commercially available cotton yield mapping system from MicroTrak and an experimental cotton yield mapping system based on load cells were evaluated in 2000 on cotton strippers in the Southern High Plains. Both systems had been modified compared to designs evaluated in 1999. They were evaluated for accuracy of yield estimates at points within the fields being mapped. The yield estimate accuracy was determined by comparing hand-sampled estimates from those of the yield map. Multiple hand samples were obtained at each site, and a 95 percent confidence interval of 110 lbs lint/ac was used for comparing the hand sample and map yield estimates. If the difference between the two estimates was less than the confidence interval for the hand samples, the two estimates were considered to be equivalent. For the MicroTrak and the TAES systems, the sample and mapped estimates were equivalent at 80 and 60 percent of the comparisons, respectively.