Wisconsin has recorded 8,575 hail events from 1955 to 2024, placing the state in the top 20 nationally (rank #16 of 50). The largest hailstone documented in Wisconsin measured 5.5 inches — softball-sized. Since 1996, the National Weather Service has logged approximately $65.8M in property and crop damage from Wisconsin hail, with the heaviest activity concentrated in June (1,740 events, the state’s busiest hail month) and the most active period (events per year) being 2000-09.
The interactive map below plots every recorded Wisconsin hail report from the NOAA Storm Prediction Center archive. Use the Min Size buttons to focus on damaging hail (1.75″ golf-ball and larger), or filter by Era to see how activity has shifted over the decades.
Interactive Wisconsin Hail Storm Map
Wisconsin hail by the numbers
| Metric | Wisconsin value |
|---|---|
| Total recorded hail events (1955-2024) | 8,575 |
| National rank (event volume) | #16 of 50 states |
| Largest hailstone on record | 5.5″ (softball-sized) |
| Busiest month | June (1,740 events) |
| Most active period (events/year) | 2000-09 |
| Total recorded damage (1996+) | $65.8M |
| Hail-related injuries (1996+) | 41 |
10 largest hailstones ever recorded in Wisconsin
These are the top ten hail reports in Wisconsin ranked by hailstone diameter. Sizes are NOAA’s measured-or-estimated diameter at time of report.
| Date | Hail size | Comparison | Reported damage | Casualties |
|---|---|---|---|---|
| 2007-06-07 | 5.5″ | softball-sized | — | — |
| 2000-06-01 | 4.5″ | softball-sized | — | — |
| 1997-07-16 | 4.5″ | softball-sized | — | — |
| 1988-06-19 | 4.5″ | softball-sized | — | — |
| 2021-09-07 | 4.5″ | softball-sized | — | — |
| 2006-04-13 | 4.25″ | softball-sized | — | — |
| 2011-05-22 | 4.25″ | softball-sized | — | — |
| 2011-05-22 | 4.25″ | softball-sized | — | — |
| 2011-05-11 | 4.25″ | softball-sized | — | — |
| 2011-05-22 | 4.25″ | softball-sized | — | — |
Costliest Wisconsin hailstorms since 1996
Property loss totals come from the National Weather Service’s Storm Events Database. Pre-1996 figures are excluded because the dataset used categorical loss codes rather than dollar amounts before that year.
| Date | Hail size | Property + crop loss | Casualties |
|---|---|---|---|
| 2020-06-02 | 2.5″ | $45.5M | — |
| 2020-06-02 | 2.5″ | $2.1M | — |
| 2019-08-05 | 2″ | $900K + $25K crop | — |
| 2021-06-17 | 1.75″ | $885K | — |
| 2017-06-16 | 2.5″ | $700K | — |
Hail size distribution in Wisconsin
How Wisconsin’s 8,575 hail events break down by hailstone size. Hail under 1″ is treated as marginally severe; the National Weather Service issues severe-thunderstorm warnings starting at 1″ (quarter size).
| Hailstone size | Events | Share of Wisconsin total |
|---|---|---|
| Under 1″ (pea to dime) | 3,573 | 41.7% |
| 1.00-1.74″ (quarter) | 3,298 | 38.5% |
| 1.75-1.99″ (golf ball) | 1,146 | 13.4% |
| 2.00-2.74″ (egg / hen-egg) | 373 | 4.3% |
| 2.75-3.99″ (baseball) | 160 | 1.9% |
| 4.00″+ (softball or larger) | 25 | 0.3% |
Activity by decade
Recorded hail events have risen across most US states over the decades — partly because of more severe weather, but largely because of vastly improved spotter networks, mobile reporting, and dual-polarisation radar coverage that came online widely after 2010. The events-per-year column normalises the 45-year pre-2000 bucket against the modern 10-year and 5-year periods so the trend is comparable.
| Period | Total events | Events per year |
|---|---|---|
| Pre-2000 (1955-99) | 1,891 | 42 |
| 2000-09 | 3,058 | 306 |
| 2010-19 | 2,402 | 240 |
| 2020-24 | 1,224 | 245 |
When Wisconsin’s hail season peaks
Wisconsin’s hail activity by calendar month, summed across all years from 1955 to 2024.
| Month | Events |
|---|---|
| January | 6 |
| February | 34 |
| March | 291 |
| April | 1,018 |
| May | 1,651 |
| June | 1,740 |
| July | 1,674 |
| August | 1,156 |
| September | 749 |
| October | 223 |
| November | 27 |
| December | 6 |
Where Wisconsin fits in the US hail picture
Wisconsin sits on the eastern or southern edge of Hail Alley — the corridor running from the Texas Panhandle through Oklahoma, Kansas, Nebraska, eastern Colorado and the Dakotas. Hail in Wisconsin tends to be driven less by classic Plains supercells and more by squall lines, mesoscale convective complexes, and warm-season cold-front passages. That means hail events here are common but the truly giant stones (3″+) are rarer than in the core Alley states.
Compare Wisconsin’s hail risk with its neighbours: Minnesota hail, Iowa hail, Illinois hail, Michigan hail.
Frequently asked questions about Wisconsin hailstorms
What is the largest hailstone ever recorded in Wisconsin?
According to NOAA Storm Prediction Center data, the largest measured hailstone in Wisconsin was 5.5 inches in diameter — softball-sized. The map above plots that event along with every other hail report on file for the state.
When does Wisconsin get the most hail?
June is Wisconsin’s busiest hail month, with 1,740 recorded events — the highest single-month total in the state’s NOAA record. Most Wisconsin hail falls in the spring and early-summer convective season; you can see the full month-by-month breakdown in the seasonality table above.
Where in Wisconsin does hail occur most often?
Use the interactive map above to identify the highest-density hail corridors. Pan, zoom and click any point to see the date, size and reported damage for that event. Patterns vary across Wisconsin — in many states the heaviest activity clusters along specific corridors driven by local terrain, lake effects, or jet-stream positioning.
Is Wisconsin’s hail activity getting worse?
Running roughly level with the 2010s pace — but interpret the trend with care. The recorded count has risen across nearly every state because spotter networks, mobile reporting apps, and dual-polarisation radar all expanded dramatically after about 2010. So a rising count partly reflects better detection rather than purely worse weather. The size-distribution and damage tables above are slightly less affected by this reporting bias.
How is hail size measured?
Reports use estimated maximum hailstone diameter in inches, usually compared to common objects: 0.75″ (penny), 1″ (quarter, the severe threshold), 1.75″ (golf ball), 2″ (egg), 2.75″ (baseball), 4″ (softball). The largest verified US hailstone, recorded in Vivian, South Dakota in 2010, measured 8 inches across.
Data sources and limitations
All hail event data on this page comes from the NOAA Storm Prediction Center SVRGIS dataset, accessed via an Esri feature service. The dataset contains over 400,000 individual US hail reports from 1955 to 2024. Property and crop loss values are recorded in actual dollar amounts from 1996 onward (categorical codes were used pre-1996, so loss totals on this page exclude those earlier years). Hailstone sizes are reported as measured-or-estimated maximum diameters; report density is influenced by population, road networks, and the modernisation of spotter networks over time.
Related Mapscaping resources: US Hailstorms map (national hub) · NOAA Storm Reports map (tornadoes, hail and wind)
