From Pea to Baseball — What Hail Size Actually Means for Your Roof

When hail rattles across Lake Zurich or Barrington on a summer evening, the first question every homeowner asks is the same: how big was it? Meteorologists measure hail against everyday objects for good reason, because size is the single best predictor of what that storm just did to your roof. As this year's hail season winds down, here is the full ladder, from harmless to serious, and what each rung means for your shingles.

At the bottom sits pea-sized hail, about a quarter inch across, followed by marble-sized at half an inch. These make plenty of noise on the gutters and rarely harm a healthy roof. But rarely is not never. On an aging roof whose shingles have already lost flexibility and granule adhesion, even small hail can scour granules loose and accelerate wear, so a fifteen-year-old roof in McHenry does not shrug off a marble-sized storm the way a five-year-old roof does.

The critical threshold arrives at quarter-sized hail, one inch in diameter. This is the point where damage to asphalt shingles typically begins: soft circular bruises, granule loss exposing the black mat beneath, and fractures in the shingle's fiberglass reinforcement that you cannot see from the ground. Half-dollar hail at an inch and a quarter and ping-pong-ball hail at an inch and a half push the odds of damage steadily higher with every additional quarter inch.

From golf-ball size upward, at an inch and three quarters, roof damage becomes a near certainty, and the destruction stops being limited to shingles. Golf-ball and larger stones dent gutters, downspouts, and window wraps, crack vinyl siding, and can break window glass outright. Tennis-ball hail at two and a half inches and baseball hail at two and three quarters, mercifully rare here, punch holes through roofs and total vehicles. If stones that size ever fall on your block, the question is not whether there is damage but how much.

Size is the headline, but two other factors decide the final story. Duration matters, because five minutes of quarter-sized hail delivers far more total impacts than thirty seconds of it. Wind matters even more, because hail driven sideways by fifty-mile-per-hour gusts strikes the sloped face of a roof at a more direct, more damaging angle and concentrates the punishment on one or two slopes. That is why adjusters and inspectors often find one side of a roof devastated while the opposite side looks untouched.

So what should you do when the stones stop falling? Note the date and time while it is fresh. Photograph several hailstones next to a coin, a golf ball, or a ruler before they melt, and if you can, tuck a few into a freezer bag as physical evidence. Walk the property and photograph any dents you spot on downspouts, grill covers, or air conditioner fins, since those soft metals record the storm even when shingle damage is invisible from the ground. Then, for anything quarter-sized or larger, schedule a professional inspection rather than climbing up yourself.

Here in Illinois, hail is most common from May through September, which means the season that just battered parts of the northwest suburbs is drawing to a close. If any of this summer's storms dropped hail on your neighborhood, the damage is still up there whether or not it has leaked yet, and most policies limit how long you have to report it. Dynasty Restoration offers free inspections with photos, measurements, and a written summary, and if your roof came through clean, we will tell you that in writing too. It costs nothing to know for certain before winter arrives.