ONGOING CLIMATE CHANGE AND HIGH-SEVERITY WILDFIRE ARE RESTRUCTURING SOUTHWESTERN UNITED STATES ECOSYSTEMS. TREE REGENERATION IN LARGE HIGH-SEVERITY PATCHES IS HIGHLY VARIABLE AND THOUGHT TO BE CONTROLLED BY DISPERSAL LIMITATIONS AND CLIMATE. POST-FIRE MANAGEMENT CAN OVERCOME DISPERSAL LIMITATIONS THROUGH PLANTING, BUT THE INTERACTION OF CLIMATE AND PHYSIOLOGY MAY BE AN IMPORTANT LIMITATION TO POST-FIRE FOREST RECOVERY. QUANTIFYING CLIMATE LIMITATION TO SEEDLING SURVIVAL WILL BE CENTRAL TO UNDERSTANDING HOW CLIMATE CHANGE WILL LIMIT FUTURE SEEDLING ESTABLISHMENT. THE OBJECTIVES OF THIS RESEARCH PROJECT ARE TO FIGURE OUT THE HEAT AND DROUGHT STRESS TOLERANCES OF DIFFERENT COMMON SOUTHWESTERN US TREE SEEDLINGS AND TO MODEL SUITABLE PLANTING LOCATIONS UNDER FUTURE CLIMATE. THIS RESEARCH WILL HELP FACILITATE POST-FIRE REFORESTATION EFFORTS.