St. Louis Hail Damage: Storm History and Homeowner Guide for 2026

St. Louis sits at the intersection of multiple weather patterns that make it one of the most hail-prone metro areas in the Midwest. Warm, humid air from the Gulf of Mexico meets cold fronts pushing through from the west and northwest, creating the severe thunderstorms that produce damaging hail across the region year after year. If you own a home anywhere in the St. Louis metro — from O'Fallon to Belleville, Chesterfield to St. Charles — hail is a risk you need to take seriously.

Why St. Louis Gets So Much Hail

The St. Louis metro area sits in a geographic sweet spot for severe convective weather. Several factors contribute:

Convergence zone — The confluence of the Missouri and Mississippi Rivers creates temperature and moisture gradients that enhance storm development

Gulf moisture access — Warm, moist air has a direct path up the Mississippi Valley, fueling the instability that produces large hail

Flat terrain — Unlike mountainous regions where terrain can disrupt storms, the relatively flat landscape around St. Louis allows supercells to maintain strength as they track through the metro

Storm tracks — Many severe weather systems follow a southwest-to-northeast path that takes them directly through the greater St. Louis area

The result is a metro area that averages dozens of hail-producing storms each year, with several events typically producing stones large enough to damage roofs and vehicles.

St. Louis Hail Storm History

The St. Louis region has experienced some of the most damaging hail events in Midwest history:

April 10, 2021 — A powerful squall line produced hail up to 2.75 inches across the metro, with the worst impacts in St. Charles County, Chesterfield, and Wildwood. Insured losses exceeded $1 billion across the region.

April 28, 2020 — Golf ball sized hail pounded north St. Louis County and portions of the Illinois side. Thousands of roofs were damaged in Florissant, Hazelwood, and Maryland Heights.

June 2014 — A multi-day severe weather outbreak brought repeated rounds of damaging hail to the metro. Cumulative damage from several events topped $500 million in insurance claims.

April 2012 — A historic hailstorm dropped tennis ball and baseball-sized hail across the northern suburbs, shattering windshields and destroying roofs from Bridgeton to O'Fallon.

These are the major events, but even in quieter years St. Louis sees multiple storms producing hail at or above the 1-inch damage threshold.

Which St. Louis Neighborhoods See the Most Hail?

Hail can hit any part of the metro area, but certain zones tend to see more frequent activity based on storm tracks:

St. Charles County — O'Fallon, St. Peters, Wentzville, and Lake St. Louis are in the direct path of storms tracking northeast out of central Missouri

West County — Chesterfield, Wildwood, Ballwin, and Ellisville catch storms as they intensify over the western suburbs

North County — Florissant, Hazelwood, Maryland Heights, and Bridgeton see frequent hail from storms approaching from the southwest

Metro East (Illinois side) — Belleville, O'Fallon IL, Edwardsville, and Collinsville catch storms as they cross the river, sometimes with enhanced severity

South County — Mehlville, Oakville, and Arnold can be impacted by storms that track along or south of the I-44 corridor

What Size Hail Damages St. Louis Roofs?

Most St. Louis homes have asphalt shingle roofs, which are vulnerable to hail damage at relatively common hailstone sizes:

0.75 to 1 inch — Can dislodge granules on older shingles and damage soft metals like gutter guards and vent covers

1 to 1.5 inches (quarter to ping pong ball) — Creates visible bruising and cracking on most asphalt shingles, especially roofs over 10 years old

1.75 inches (golf ball) — Causes significant damage to nearly all standard roofing materials

2 inches and above — Can crack dimensional shingles, puncture underlayment, and damage structural decking

Given that St. Louis regularly produces storms with hail exceeding 1.5 inches, most roofs in the metro will sustain hail damage at some point during their service life.

How to Check Your St. Louis Hail History

Many St. Louis homeowners do not realize how many hail events have occurred near their address. Even if you did not notice a storm, your roof may have been impacted.

HailScore provides a free hail history lookup for any address in the St. Louis metro area. Enter your address and get a detailed report showing every documented hail event near your property, including dates and hailstone sizes from real NOAA radar data. Your HailScore rating gives you a clear picture of your cumulative hail risk.

This information is especially valuable when:

Buying a home — Understand the hail history before you close

Renewing insurance — Know your risk level and whether impact-resistant roofing discounts are worth the investment

Planning a roof replacement — Make an informed decision about materials based on your actual hail exposure

Filing a claim — Document storm events at your address with third-party data

Signs of Hail Damage to Look For

After a hailstorm in the St. Louis area, check for these indicators:

Circular dents on shingles — Hail impacts leave round depressions that are often easier to feel by hand than to see

Granule accumulation in gutters — Excessive black granules washing off shingles is a strong indicator of surface damage

Dented gutters and downspouts — Aluminum components show hail impacts clearly

Cracked or missing shingles — Larger hail can break shingles at impact or loosen them so they blow off later

Damaged window screens and AC units — These soft materials dent at lower thresholds and can confirm hail reached your property

Dents on vehicles or outdoor furniture — If cars show dimples, your roof likely took the same beating

Filing an Insurance Claim in Missouri and Illinois

Because the St. Louis metro spans two states, the rules around hail damage claims differ depending on which side of the river your home is on.

Missouri:

No specific statutory deadline for filing, but most policies require prompt notice (typically within one year)

Missouri uses a "valued policy" law for total losses — if your home is a total loss, the insurer pays the full policy amount

Separate hail deductibles are common and may be percentage-based

Illinois:

Similar prompt notice requirements apply

Illinois does not have a valued policy law for wind and hail claims

Some Illinois insurers are moving toward percentage-based wind and hail deductibles

For both states:

Document all damage with photos and video before making any repairs

Get an independent roofing contractor inspection alongside your insurance adjuster's assessment

Your HailScore report provides documented storm evidence that can support your claim timeline

Keep records of all communication with your insurer

Choosing the Right Roofing Material for St. Louis

Given the hail frequency in the area, material selection matters. Here is how common options hold up:

Standard three-tab shingles — Least expensive but most vulnerable. Not recommended in the St. Louis market

Architectural (dimensional) shingles — Better impact resistance than three-tab, and the most common choice in the metro

Class 4 impact-resistant shingles — Rated to withstand 2-inch hail. Many Missouri and Illinois insurers offer 10 to 28 percent premium discounts for Class 4 roofs

Metal roofing — Excellent hail performance but can show cosmetic denting. Standing seam profiles resist damage better than exposed fastener panels

Synthetic slate — Strong impact resistance with a premium appearance

For most St. Louis homeowners, Class 4 impact-resistant shingles offer the best balance of cost, durability, and insurance savings. The premium over standard architectural shingles typically pays for itself within five to seven years through reduced insurance costs alone.

Check Your St. Louis Hail Risk Now

Whether you live in Kirkwood, O'Fallon, Edwardsville, or anywhere else in the metro, your property has a hail history. Look up your address on HailScore to see exactly what storms have passed through your area — free, with real NOAA data.

Your roof's past matters. Knowing your hail history is the first step to protecting your home.