Illinois Hail Map & History
Illinois was hit as recently as 2026-08-21, 24 days ago. NOAA's Storm Prediction Center has logged 556 separate hail days in Illinois since 2010, across 4,849 individual storm reports. 122 of those days brought hail 2 inches or larger, and the largest stone on record is 6.1 inches on 2026-03-10 near Kankakee.
Illinois sees damaging hail from central Springfield and Peoria up through the Chicago collar counties. Pick a date below to see the NOAA radar swath and reports, or check a specific address.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Illinois. Radar-indicated, not a guarantee of damage.
A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Illinois 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 ->Hail history in Illinois
Illinois averages 33 reported hail days a year across 17 years of NOAA archive, about 7 of them carrying hail 2″ or larger -- the size that routinely totals roofs. Major metros watched here: Chicago, Springfield, Peoria, Rockford.
When it hails in Illinois
Illinois's busiest hail month is June, with 108 of its 556 hail days on record. March through August holds 479 of them, 86% of the record.
| Month | Hail days since 2010 |
|---|---|
| January | 6 |
| February | 14 |
| March | 54 |
| April | 85 |
| May | 99 |
| June | 108 |
| July | 71 |
| August | 62 |
| September | 26 |
| October | 16 |
| November | 11 |
| December | 4 |
Top Illinois counties by hail frequency
| County | Hail days since 2010 | Largest stone |
|---|---|---|
| Cook | 76 | 2.75″ |
| Will | 57 | 3.00″ |
| Madison | 55 | 3.75″ |
| Sangamon | 48 | 3.25″ |
| St. Clair | 47 | 3.00″ |
| Kane | 44 | 2.50″ |
Illinois hail history by county
68 Illinois counties have at least 13 NOAA hail days on record since 2010 -- enough archive signal for a page of their own. Ordered by hail days.
Cook County · Will County · Madison County · Sangamon County · St. Clair County · Kane County · Winnebago County · Adams County · Peoria County · Vermilion County · Fulton County · Macoupin County · Tazewell County · Henry County · Hancock County · DuPage County · McHenry County · La Salle County · Champaign County · Bureau County · Christian County · Kankakee County · Jackson County · McDonough County · Whiteside County · Franklin County · Knox County · Lake County · Ogle County · Macon County · McLean County · Monroe County · Morgan County · Rock Island County · Williamson County · Woodford County · Coles County · Marion County · Randolph County · De Kalb County · Stephenson County · Warren County · Boone County · Johnson County · Livingston County · Jefferson County · Jo Daviess County · Lee County · Logan County · Montgomery County · Washington County · Clark County · Iroquois County · Kendall County · Perry County · Clinton County · Menard County · Moultrie County · Pike County · Edgar County · Effingham County · Grundy County · Lawrence County · Brown County · Clay County · Shelby County · Douglas County · Mercer County
Recent Illinois hail days
| Date | Max hail | Reports |
|---|---|---|
| 2026-08-21 | 2.50″ | 9 |
| 2026-08-13 | 1.00″ | 1 |
| 2026-08-12 | 1.00″ | 2 |
| 2026-08-11 | 1.00″ | 1 |
| 2026-08-09 | 1.00″ | 3 |
| 2026-07-28 | 2.00″ | 1 |
| 2026-07-27 | 3.00″ | 68 |
| 2026-07-26 | 1.00″ | 1 |
How to read the Illinois map
The colored swath is NOAA's MRMS radar estimate of the largest hail in each ~1 km cell; the dots are individual SPC ground reports. Yellow is around an inch, red is 1.5 to 2″, and purple is 2″ and up -- see how hail size maps to roof damage. Click any spot on the map to see the hail history at that point, or look up a full street address on the hail history by address tool. Today's nationwide activity is on today's hail report.
Nearby states
North Dakota · Arkansas · New Mexico · Wyoming · North Carolina · Georgia
FAQ
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.