How Catastrophe Models Predict Disasters—And Affect Home Insurance

When major insurance companies started dropping homeowners’ policies in California, residents faced a tough question: Should they fight back, or should they move? The reality is that insurance companies rely on complex mathematical models—known as Catastrophe Models, or Cat Models—to predict risks. And when those models show danger levels rising beyond sustainable levels, insurers take action.

What Are Cat Models?

Catastrophe Models are powerful tools used by insurance companies to assess potential risks. These models analyze a vast amount of data, including property locations, construction materials, past disaster patterns, and economic factors such as inflation. They also consider climate conditions, like California’s increasingly severe wildfires. The goal is to estimate the likelihood and financial impact of future disasters, helping insurers set policy prices—or decide whether to provide coverage at all.

The California Insurance Crisis

When insurers began pulling out of California, it was likely because their Cat Models signaled extreme risks. According to the Cato Institute, companies saw the potential for devastating financial losses, making it too dangerous to continue offering policies in the state.

Insurance pricing is also influenced by reinsurance companies—the firms that provide backup coverage for insurers. If reinsurance companies determine that risks are too high, they raise their own rates. In California, state regulations prevented insurance companies from raising homeowners’ rates to match those increasing costs. As a result, insurers found themselves unable to operate profitably, leading many to withdraw from the market altogether.

The Wildfire Factor

California’s wildfire history has played a major role in shaping insurance risk assessments. The 2017 wildfire season alone erased more than a decade of profits for insurance companies, according to Milliman PRM analytics. Then came the disastrous fires of 2018, and later, the devastating blazes of 2025. For insurers, the math simply didn’t add up.

A Potential Solution? Rewarding Risk Reduction

Despite their dire predictions, Cat Models could also provide a path forward. Milliman suggests that insurance companies could use these models to offer discounts to homeowners who take steps to reduce fire risks, such as clearing brush, installing fire-resistant materials, or upgrading sprinkler systems. If insurers can adjust policies based on real risk reduction, it could provide a way to make coverage more accessible without ignoring financial realities.

A Warning for Other States

While California’s situation is extreme, it isn’t unique. Other disaster-prone states—whether facing hurricanes, floods, or tornadoes—also depend on Cat Models to guide insurance decisions. As climate patterns shift and natural disasters become more frequent, these models will continue to play a major role in determining who can get insured—and at what price.

For homeowners, the takeaway is clear: understanding risk isn’t just an insurance company’s job. Homeowners who recognize the role of catastrophe modeling can better prepare for the future, whether that means making their homes safer or, in some cases, reconsidering where they live.