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Remote sensing of evapotranspiration (ET) over crops could be valuable for managing scarce water resources, especially for irrigated lands. In the past decade remote sensing techniques have advanced to allow frequent estimation of ET at farm scales. These techniques include wider availability of higher resolution image data, development of remote sensing-based energy balance models, and deployment of low-cost ground-based radiometric systems. Used together, ET can be estimated at daily to weekly time steps, despite occasional adverse sky conditions. The benefits of combining these newer capabilities was demonstrated using experimental data collected over a cotton crop at Maricopa, Arizona in 2003. The way data were acquired and combined was similar to the way sensors are currently deployed in local wireless networks. The potential for future operational ET estimation at farm-scales will be discussed.