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Numerous energy balance (EB) algorithms have been developed to use remote sensing data for mapping evapotranspiration (ET) on a regional basis. Adopting any single or a combination of these models for an operational ET remote sensing program requires thorough evaluation. The Surface Energy Balance System (SEBS) was evaluated for its ability to estimate daily ET rates of summer crops grown in the Texas High Plains using Landsat 5 Thematic Mapper data acquired on 10 July 2007. Performance of SEBS was evaluated by comparing estimated daily ET with measured weighing lysimeter ET data from four large lysimeters at the USDA-ARS Conservation and Production Research Laboratory, Bushland, Texas. SEBS estimated daily ET values measured with the weighing lysimeter measurements indicated that the SEBS model may provide good ET estimates for both irrigated and dryland fields.