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The Mississippi cotton yield monitor is based on a novel optical cotton-flow sensor, and it has been developed and field-tested since 1999. About 4600 ac of cotton were harvested with harvesters equipped with prototypes of the Mississippi cotton yield monitor in the 1999, 2000, and 2001 harvesting seasons. This paper reports the field-test results with the Mississippi cotton yield monitor on cotton strippers in the 2001 season. The accuracy of the yield monitor was evaluated load by load on a stripper in Lubbock, Texas, where 64 loads were weighed over eight days. The average absolute error of the Mississippi cotton yield monitor was less than 5%, when compared with loadcell and scale weights of harvester basket loads of cotton. In southern Georgia, 220 ac of cotton were harvested with a cotton stripper equipped with the Mississippi cotton yield monitors. Yield maps have been created with data from the field tests, and the maps realistically exhibit yield variations within fields. The results showed that Mississippi cotton yield monitor performed on a cotton stripper as well as it has on the cotton picker. The tests also indicated that this yield monitor was reliable and easy to install, operate, and maintain.