The Wildfire Resiliency Code - Fire Intensity Classification draft layer for the Colorado Wildire Resiliency State Code Map was developed by the Division of Fire Prevention and Control (DFPC) and the Colorado State Forest Service (CSFS) at the direction of the Wildfire Resiliency Code Board (WRCB).
This layer is meant to encompass both the current and potential Wildland Urban Interface (WUI), as defined by the International Wildland-Urban Interface Code (IWUIC) and WRCB, or the, \"…geographic area where structures and other human development meets or intermingles with wildland or vegetative fuels\". As such, the primary focus of any layer must include all locations in Colorado where combustible vegetative fuels exist.
The classification's starting point is the 2022 Colorado Wildfire Risk Assessment (CO-WRA) Fire Intensity Scale layer, which primarily relies on vegetative fuel data, but also topography and weather conditions to generate a state-wide indication of how intense a wildfire may be in a given location and therefore can be used to forecast the potential harm or damage if a wildfire occurs. The layer does not consider probability or risk of wildfire ignition. The intensity values are classified into standard fire intensity levels based on flame length values for easy interpretation, and the levels in the original 2022 CO-WRA FIS layer include lowest, low, moderate, and high intensity. The original layer was generated at a 20-meter resolution, and was deemed too detailed for state-wide planning, code implementation, and enforcement efforts by the WRCB. The layer was further refined through smoothing, filtering, and aggregation techniques to provide simple but consistent transitions across classification types based on WRCB input. The final form illustrates only three levels of the original fire intensity (low, moderate, and high) for the purpose of code application, and appears as a hexagon layer, a GIS method that is useful for grouping geospatial data into hexagonal grids. This aggregation method supports the reality that wildfire hazards are experienced at scales beyond that of an individual parcel or home and is influenced in part by adjacent conditions.
High and Moderate fire intensity classifications correspond to Class 2 draft construction and site hardening requirements, while Low fire intensity classification corresponds to Class 1 draft code requirements. The crosshatched categories represent federal/tribal lands where the code will not be implemented.
Questions related to 2025 Colorado Wildfire Resiliency Code application can be sent to cdps_dfpc_wrcb@state.co.us
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