As Southern California faces the onset of the Santa Ana winds, which elevate wildfire risks, questions are mounting about the reliability and usefulness of fire risk scores featured on real estate platforms. These ratings aim to convey the likelihood a home might be affected by wildfire, but experts caution that such scores offer limited precision and should be interpreted carefully.

Wildfire behavior is influenced by numerous complex factors, including wind patterns, the types and arrangement of flammable materials, and moisture levels in vegetation, air, and soil. According to Hussam Mahmoud, a civil engineer at Vanderbilt University, wildfires rank among the most challenging natural hazards to predict accurately. Wind, which can change rapidly and varies significantly at small geographic scales, plays a critical role in fire spread, complicating modeling efforts further.

In urban and suburban settings, predicting wildfire spread becomes even more difficult. Scientists are still working to understand how fires move through developed areas, and some caution against relying on risk assessments at the individual property level. Mahmoud suggests that new models based specifically on urban fire dynamics will be necessary for improved accuracy.

Michael Gollner, director of the Fire Research Lab at the University of California, Berkeley, highlighted that while fire modeling has advanced for wildland areas over the past two decades, research into urban fire behavior remains nascent. His team is conducting controlled experiments that involve burning entire houses in laboratory settings to gain insights. Gollner acknowledges that current fire risk models provide limited accuracy when applied to single homes, especially at county or broader scales, but he maintains they remain valuable.

Despite these limitations, experts agree that fire risk scores serve an important role in signaling potential hazards. Rather than predicting exact outcomes, these scores primarily indicate whether a property faces any wildfire risk. Ed Kearns, chief science officer at risk-modeling firm First Street, advises homebuyers to focus first on whether the score is above the lowest risk level. For houses scoring two or higher on a scale from one to ten, he recommends further investigation.

However, fire risk scores do not account for community-level mitigation efforts, such as vegetation management or improvements to evacuation infrastructure. Gollner recommends that prospective buyers and residents engage with neighbors and local resources to gain a fuller understanding of fire preparedness.

Additional information can be found through state and county fire records, U.S. Forest Service guidelines on fire-resilient construction, and neighborhood groups like FireWise. Gollner emphasizes that, in the end, a home’s fire resilience comes down to its construction features, parcel size, and defensible space, such as metal roofing, sealed vents, and distance from surrounding structures. Widespread adoption of such precautions could reduce the likelihood that an entire community suffers severe fire damage.

Residents are urged to remain prepared regardless of perceived risk levels. Gollner recommends using wildfire alert apps, routinely practicing evacuation plans, and evacuating early during emergencies. “Wildfires are very fast events,” he said. “Are you concerned about losing the house? Or are you concerned about losing your life?”