What Size Hail Damages a Roof?

The short answer: hail around 1 inch in diameter — quarter-sized — is the commonly cited threshold where asphalt shingle damage becomes likely. But that number moves a lot depending on your roof's age and material, and smaller hail with strong wind behind it can damage a roof that "should" have survived.

Mixed pea- to quarter-sized hail — right at the damage threshold for older asphalt roofs. Photo: Bdahl (public domain)

Hail size reference chart

Hail size	Compared to	Typical risk to asphalt shingles
0.5"	Marble	Rarely functional damage; may scuff aging roofs
0.75"	Penny	Possible on old or brittle shingles, soft metals dent
1"	Quarter	Common damage threshold — inspection worth it
1.25"	Half dollar	Damage likely on most asphalt roofs
1.5"	Ping-pong ball	Damage very likely, including newer roofs
1.75"	Golf ball	Widespread damage expected, punctures possible
2.5"+	Tennis ball+	Severe damage to nearly any roofing material

Why roof age matters as much as hail size

A five-year-old architectural shingle is flexible and heavily granulated — it absorbs a quarter-sized stone without functional damage more often than not. A twenty-year-old three-tab shingle is brittle, thin, and has already shed much of its protective granule layer. The same stone that bounces off the new roof can bruise or crack the old one.

This is why two neighbors can experience the same storm with opposite outcomes, and why "my neighbor's claim was approved" doesn't guarantee yours will be — or vice versa.

Material matters too

• Asphalt shingles — the 1-inch rule of thumb applies. Damage shows as dark "bruises" where granules were knocked away, exposing the mat.
• Metal roofing — dents from smaller hail are common but often classified as cosmetic, which some policies exclude. Functional damage (broken seams, punctures) usually takes larger stones.
• Wood shakes — split along the grain from roughly 1.25" hail.
• Tile and slate — very impact-resistant until they crack outright, typically from stones 1.5" and up.
• Class 4 impact-resistant shingles — designed to survive 2" simulated hail. Real-world large hail can still damage them, but the threshold is much higher.

Wind is the multiplier across all of these: a 0.75" stone in a 60 mph gust hits with far more energy than the same stone falling straight down.

Soft metal tells the truth: a vent cap dented by hail. Metal like this dents at sizes that may or may not damage shingles — which is why adjusters check it first. Photo courtesy of Yellowhammer Roofing, used with permission.

What to do if your hail was near the threshold

If the hail at your address was 1 inch or larger — or smaller but wind-driven onto an older roof — it's worth checking for the specific damage signs and getting a professional inspection before deciding anything about a claim. Not sure what actually fell at your address? Here's how to check the public storm records. Look at ground-level evidence first: dented gutters and downspouts, dinged window wraps, and splatter marks are the same clues an adjuster will use to confirm hail occurred at your property.

And before you call your insurer, know that filing has a process and a sequence — inspecting first and filing second is usually the better order.