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Increased measurements of particulate matter (PM) emission from commercial cattle feedlots, as well as better understanding of the factors affecting PM emission, are needed to develop more effective abatement measures and more realistic emission factors/standards. At present, available data are limited on continuous measurement of PM10 (PM with equivalent aerodynamic diameter of 10 m or less) and virtually non-existent on PM2.5 (PM with equivalent aerodynamic diameter of 2.5 m or less) for cattle feedlots. Two commercial cattle feedlots (KS1 and KS2) in Kansas were instrumented with tapered element oscillating microbalances (TEOMs) that were configured to continuously measure PM. KS1 was instrumented with one TEOM PM10 and one TEOM PM2.5 samplers upwind of the feedlot; a similar set of samplers were set up on the downwind side of the feedlot. One TEOM PM10 was set up upwind and one downwind of KS2. Within a given day, PM concentrations were generally greatest the 7:00 PM to 11:00 PM. The average monthly net PM10 mass concentration (1-h averaging period) ranged from 7 to 298 g/m3 for KS1 and 9 to 203 g/m3 for KS2. The average monthly PM2.5 mass concentration (1-h averaging period) for KS1 ranged from 2 to 20 g/m3. The PM2.5/PM10 ratio for KS1 ranged from 0.02 to 0.13. Concentrations were generally largest during the months of May November and smallest during the months of December March.