Hail Exposure in Grand Forks, ND

Grand Forks, ND has recorded 585 hail events within a 15-mile radius since 2015, based on NOAA NEXRAD radar data. With over 585 events in a decade, Grand Forks is considered a high-risk hail area.

The average hail size recorded near Grand Forks is 1.15 inches. The largest single event recorded reached 4 inches. Hail above 1 inch is capable of cracking shingles, and hail above 1.75 inches can cause severe structural damage requiring full roof replacement.

Hail season in North Dakota typically runs May through August. During these months, atmospheric conditions create powerful convective thunderstorms capable of producing large hail. Grand Forks residents should inspect their roofs after any storm and consider a professional inspection each spring.

Many standard homeowner's policies in North Dakota include hail under a "wind and hail" peril, but coverage, deductibles, and filing windows vary by carrier and policy. Confirm yours with your insurer. Document what you observe promptly. Even if damage isn't obvious from the ground, a licensed roofer can check for impacts during an inspection.

Start by looking for obvious signs from the ground: dented gutters, dings on metal vents, chipped paint, or broken skylight glass. On the roof itself, hail damage appears as dark circular bruises or "spatter" marks on asphalt shingles where granules have been knocked away. Because roof damage is often subtle, many Grand Forks homeowners miss it without a professional inspection. If HailScore shows events of 1 inch or larger near your property, scheduling a free inspection with a local contractor is strongly recommended.

A HailScore is a 0–100 risk index that measures historical hail activity near a specific property. The score is calculated from five factors derived from NOAA NEXRAD radar data: storm frequency (how many events), recency (recent storms score higher), hail size (larger hail = more damage potential), cumulative damage (repeated storms compound wear), and proximity (storms closer to your address weigh more). A score of 0–25 is Low, 26–50 is Moderate, 51–75 is High, and 76–100 is Very High — the same sacred bands used on the live report.

If your property is in Grand Forks and any nearby storms have produced hail of 1 inch or larger, a free professional roof inspection is highly recommended. Given that Grand Forks has recorded hail up to 4 inches, there is a real probability of roof damage that insurance may cover. Many roofing contractors in ND offer free inspections and can document damage for your insurance claim at no upfront cost.

Hail damage repair costs in Grand Forks typically range from $8,000–$25,000+ for full roof replacement. The final cost depends on roof size, pitch, material type (asphalt shingles vs. metal vs. tile), and the extent of damage. In most cases, if hail damage is confirmed, your homeowner's insurance will cover the cost of repair or replacement minus your deductible. Getting multiple contractor estimates before filing a claim is a smart approach.

HailScore uses data from the NOAA NEXRAD radar network (Next Generation Weather Radar), specifically the SWDI (Severe Weather Data Inventory) maintained by NCEI (National Centers for Environmental Information). For Grand Forks, we analyze all radar-detected hail events within a 15-mile radius from 2015 to present, totaling over 585 verified events. Each record includes the storm's timestamp, geographic coordinates, and measured hail diameter in inches.

HailScore data comes directly from NOAA's NEXRAD radar network, which is the same system used by the National Weather Service for official storm reporting. Radar detection has a small margin of error. Hail size estimates can vary by ±0.25 inch compared to ground truth measurements. We use the 15-mile radius to capture hail that may have affected your specific neighborhood even if the storm center was nearby. For the most precise assessment of your individual property, a physical roof inspection by a licensed contractor is always recommended.