Decision-makers need better methods for identifying critical ecosystem vulnerabilities to changing climate and fire regimes. Climate-wildfire-vegetation interactions are complex and hinder classification and projection necessary for development of management strategies. The recently developed vulnerability assessment (VA) tool, FireCLIME VA, is designed to estimate ecosystem vulnerability to the interactive effects of fire and climate regime change. The FireCLIME VA can also compare management strategies under various climate scenarios and gauge the potential effectiveness of those strategies for reducing undesirable impacts of climate on wildfire regimes and of wildfire on natural ecosystems. FireCLIME is meant to be quick, flexible, and amendable to a range of data inputs (literature review, expert, modeling or monitoring activities) allowing users to easily compare various fire-climate outcomes for one or more ecosystems of interest. Users can use literature, hypothetical scenarios, or quantitative data to implement the FireCLIME VA tool.