**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** 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.