The most recent reported hail day was 2025-09-06, 328 days ago. Cobb County is hit in most years. The largest stone on record here is 1.75 inches, a golf ball and 1.8 times the National Weather Service's 1 inch severe criterion, reported on 2023-09-12 near Lost Mountain Par.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Georgia. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2025-09-06, around Oak Grove. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Cobb 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 56 separate reports between them, two or three on a typical one. 5 of those 17 years produced none at all. One year dominates the record: 2012 alone produced 6 of the 29 days. The last five years track the long-run rate, with 6 days since 2022.
No stone of 2 inches or more has ever been reported in Cobb County: all 29 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 4 of the 29 days.
Across the whole of Georgia, see the Georgia hail map and history.
Reports cluster nearest Marietta -- 8 of the county's 29 hail days -- then Smyrna (8), Acworth (7), Kennesaw (4) and Mableton (3). Beyond those, NOAA names Powder Springs and Austell on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Marietta | 5 | 1.25″ |
| Smyrna | 5 | 1.00″ |
| Acworth | 3 | 1.75″ |
| Kennesaw | 3 | 1.25″ |
| Austell | 2 | 1.00″ |
Cobb County has no tight season -- it takes 7 months (March through September) to account for 90% of the 29 days on record. June is the single busiest month, with 8 of them (28%). That peak sits inside the window rather than at either end. Hail has also been reported in January, February and October, outside that window. November and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| January | 1 |
| February | 1 |
| March | 3 |
| April | 4 |
| May | 4 |
| June | 8 |
| July | 2 |
| August | 2 |
| September | 3 |
| October | 1 |
That day put 1 report on the map, the biggest 1 inch near Oak Grove. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-09-06 | 1.00″ | 1 |
| 2025-06-26 | 1.25″ | 2 |
| 2023-09-12 | 1.75″ | 5 |
| 2023-06-06 | 1.00″ | 1 |
| 2022-08-05 | 1.50″ | 1 |
| 2022-06-16 | 1.25″ | 1 |
| 2021-03-25 | 1.00″ | 1 |
| 2020-08-19 | 1.00″ | 2 |
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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Fulton County (32 hail days), Cherokee County (20) and Bartow County (20). Cobb County sits in between.
Fulton County · Cherokee County · Bartow County
Back to the Georgia hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Cobb County, Georgia only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.