Frost events present a significant threat to perennial crop producers due both to potential bud damage and mitigation costs. Growers struggle to optimize the utilization of three primary active mitigation methods--heaters, wind machines, and over- and under-tree sprinkler irrigation--due to a reliance on regional weather forecasts, rules-of-thumb, and heuristic decision-making. Our overall project objective is to develop an intelligent frost mitigation control actuation system, based on micrometeorological monitoring and site-specific, mitigation-informed weather and bud temperature forecasts, that reduces both crop damage and mitigation costs. Washington State is the top producer of sweet cherries and blueberries--both vulnerable to frost damage and the focus of this project.Toward the overall project objective, we will pursue three specific aims: Aim #1. Integrate surface?and?aerial?meteorological?observations into?field-specific,?short-term?forecasts?of weather variables relevant to frost mitigation. Aim #2. Develop localized weather data-driven intelligent crop loss management system through real-time actuation of either-or combinations of active frost mitigation techniques, i.e. wind machines (frost fans), over-tree and under-tress fixed spray systems. Aim #3. Assess grower?evaluation/validation of decision aid tools and prototype performance.