The most recent reported hail day was 2026-04-02, 120 days ago. Rock Island County is hit in most years. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2018-06-08 near Buffalo Prairie.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Illinois. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-04-02, around Coal Valley. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Rock Island County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
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See call-center options ->NOAA's Storm Prediction Center has logged 24 separate hail days here since 2010 -- 1.4 a year over 17 years of record. Those days carry 44 separate reports between them, two or three on a typical one. 3 of those 17 years produced none at all. The busiest single year was 2023, with 3 hail days. The last five years track the long-run rate, with 7 days since 2022.
Most hail here stays under 2 inches: only 1 of the 24 days on record passed it, 4%, the last on 2018-06-08. Those big days do not follow the county's usual calendar: most of them fall in June, not April. Golf-ball size is rarer still: 1.75 inches or more on 3 of the 24 days.
Across the whole of Illinois, see the Illinois hail map and history.
Reports cluster nearest Rock Island -- 5 of the county's 24 hail days -- then Moline Quad-City Airpor (4), Buffalo Prairie (3), Coal Valley (3) and Taylor Ridge (3). Beyond those, NOAA names Andalusia and Moline on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Moline Quad-City Airpor | 4 | 1.50″ |
| Rock Island | 2 | 1.50″ |
| 1 E Buffalo Prairie | 2 | 1.00″ |
| Andalusia | 2 | 1.00″ |
| Taylor Ridge | 2 | 1.00″ |
The season runs April through August: 21 of the 24 hail days on record fall in those 5 months (88%). April is the single busiest month, with 9 of them (38%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in March and September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 9 |
| May | 5 |
| June | 3 |
| August | 4 |
| September | 1 |
That day put 5 reports on the map, the biggest 1 inch near Coal Valley. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-02 | 1.00″ | 5 |
| 2024-04-16 | 1.00″ | 1 |
| 2024-03-04 | 1.00″ | 2 |
| 2023-09-26 | 1.00″ | 1 |
| 2023-05-07 | 1.00″ | 1 |
| 2023-03-31 | 1.00″ | 2 |
| 2022-06-06 | 1.00″ | 1 |
| 2021-08-11 | 1.00″ | 1 |
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Yellow is about an inch, red 1.5 to 2″, purple 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 3 inches, which is the purple band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own, over the state line included: Mercer County (13 hail days), Henry County (37), Knox County (25), Scott County, Iowa (31) and Clinton County, Iowa (23). Rock Island County sits in between.
Mercer County · Henry County · Knox County · Scott County, Iowa · Clinton County, Iowa
Back to the Illinois hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Rock Island County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.