The most recent reported hail day was 2026-03-11, 142 days ago. Kankakee County has recorded hail in nearly every year on the archive. The largest stone on record here is 6.1 inches and 6.1 times the National Weather Service's 1 inch severe criterion, reported on 2026-03-10 near Kankakee.
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 2026-03-11, around Bourbonnais. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Kankakee 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 29 separate hail days here since 2010 -- 1.7 a year over 17 years of record. Those days carry 68 separate reports between them, two or three on a typical one. Exactly one year since 2010 passed with no reported hail day at all. The busiest single year was 2012, with 4 hail days. The last five years track the long-run rate, with 8 days since 2022.
4 of the 29 days reached 2 inches or more -- 14%, or about one hail day in 7, the last on 2026-03-11. Those big days do not follow the county's usual calendar: most of them fall in March, not May. Golf-ball size is rarer still: 1.75 inches or more on 7 of the 29 days.
Across the whole of Illinois, see the Illinois hail map and history.
Reports cluster nearest Kankakee -- 7 of the county's 29 hail days -- then Bourbonnais (7), Manteno (6), Grant Park (5) and Bonfield (3). Beyond those, NOAA names Bradley, Buckingham, Essex, Herscher and Momence on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Bourbonnais | 6 | 3.00″ |
| Manteno | 5 | 1.00″ |
| Grant Park | 4 | 1.25″ |
| Kankakee | 3 | 3.00″ |
| 1 W Bourbonnais | 2 | 4.50″ |
The season runs March through July: 24 of the 29 hail days on record fall in those 5 months (83%). May is the single busiest month, with 7 of them (24%). That peak sits inside the window rather than at either end. Hail has also been reported in August, September and October, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| March | 5 |
| April | 2 |
| May | 7 |
| June | 5 |
| July | 5 |
| August | 2 |
| September | 2 |
| October | 1 |
That day put 1 report on the map, the biggest 4.5 inches near Bourbonnais. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-11 | 4.50″ | 1 |
| 2026-03-10 | 6.10″ | 27 |
| 2025-07-10 | 1.25″ | 1 |
| 2025-03-19 | 1.00″ | 1 |
| 2024-04-01 | 1.00″ | 1 |
| 2023-05-07 | 1.00″ | 1 |
| 2023-04-19 | 1.25″ | 2 |
| 2023-03-31 | 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 6.1 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: Grundy County (14 hail days), Iroquois County (16), Will County (56) and Newton County, Indiana (14). Kankakee County sits in between.
Grundy County · Iroquois County · Will County · Newton County, Indiana
Back to the Illinois hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Kankakee County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.