California homes face rising loss as wildfires outpace safety upgrades

A new analysis by UC Merced reveals that the proportion of California homes that endure wildfires has dropped sharply, rising from roughly 3% at the turn of the century to 18% by 2020. The decline reflects a mismatch between long-standing mitigation policies—such as expanded vegetation clearance zones and fire-resistant construction standards—and the growing severity of fires driven by climate change and wind-fueled conditions.

Scientists suggest that larger, faster-spreading fires can reach homes before firefighters can intervene, and that recent housing growth in fire-prone areas amplifies vulnerability. Data show that homes built with fire-hardening features survive at higher rates than unprotected structures, yet overall survival odds continue to fall. The findings underscore that even robust retrofits may be insufficient when homes are sited in hazardous settings.