Hail Risk in the US: How FEMA Scores It and How to Prepare
Hail rarely kills anyone in the United States, yet it is one of the country’s most expensive weather hazards — insured hail losses now routinely exceed $10 billion a year, driven by a collision of bigger metro areas, pricier roofs, and solar panels meeting the same old storms. A single hailstorm over a city can damage hundreds of thousands of roofs and vehicles in twenty minutes. In the National Risk Index, hail (hazard code HAIL) accounts for roughly $3.2 billion in expected annual loss across 3,126 counties.
What counts as hail risk
Hail forms when thunderstorm updrafts carry raindrops into sub-freezing air repeatedly, layering ice until the stone falls. Severe-criteria hail starts at 1 inch (quarter size); damage escalates sharply with size because impact energy scales with mass and speed — golf-ball hail (1.75”) dents cars and cracks older shingles, baseball hail (2.75”) punctures roofs, and softball stones fall at highway speeds.
The US sees more large hail than anywhere on Earth, courtesy of the same Great Plains storm machine that produces tornadoes. “Hail Alley” — the corridor from Texas through Oklahoma, Kansas, Nebraska, and eastern Colorado/Wyoming — averages 7–9 hail days a year. The costliest events, though, happen when that climatology intersects a metro: the 2024 Dallas–Fort Worth storms, Calgary-style events over Denver, and San Antonio’s 2016 storm (~$1.4B) are the modern pattern.
How the NRI measures it
FEMA combines each county’s exposure (building value, population, vehicles implicitly through loss history, and crops), annualized hail frequency from NOAA storm reports, and historic loss ratios into an Expected Annual Loss scored 0–100 relative to all counties. Frequency times rooftops is the formula in practice — which is why the ranking is dominated by big metros inside Hail Alley.
Where the risk concentrates
Texas metros own the top of the table: Dallas County (score 100, ~$128M expected annual loss, ~9 hail events/year) and Tarrant County (Fort Worth, ~$113M) lead, with Bexar (San Antonio), Collin (north Dallas suburbs), and Denver County, CO (~$72M, ~8 events/year) close behind. The Front Range from Denver to Cheyenne has the nation’s highest large-hail frequency; Oklahoma City, Wichita, Omaha, and Minneapolis all carry heavy ratings. Agricultural hail loss — a crop-shredding subset — concentrates in the Plains wheat and corn belt.
How to read your county’s score
Hail risk translates almost directly into roof economics. In a Very High county, your roof will statistically take damaging hail during its service life, your auto comprehensive premium already prices local hail, and your homeowners policy likely carries a separate (higher) wind/hail deductible — often 1–2% of dwelling coverage rather than a flat amount. Check that deductible; many homeowners discover it only at claim time.
What actually reduces the risk
- Buy the impact-rated roof. Class 4 (UL 2218) impact-resistant shingles or metal roofing survive most hail that destroys standard shingles, and insurers in hail states offer meaningful premium discounts — over a roof’s life the upgrade typically pays for itself in Hail Alley. The newer IBHS severe-hail standard is stricter still.
- Garage the vehicles. Cars are the other half of hail losses; covered parking during spring storm season is free mitigation. If a warned storm approaches and you have no garage, blankets beat nothing.
- Protect the glass and the panels: skylight covers, and for solar arrays, panels rated to UL 61730 large-hail impact — hail is now the leading cause of utility-scale solar losses.
- After the storm, control the claim: photograph damage promptly, get an independent roofer’s inspection, and be wary of storm-chasing contractors demanding assignment of benefits — post-hail fraud is an industry of its own.
- Watch the watches. Severe thunderstorm warnings mention expected hail size; golf-ball-plus warnings are your cue to move cars and stay away from windows. Injuries are rare and almost always people caught outside.