The most recent reported hail day was 2026-04-27, 95 days ago. St. Louis County is hit in most years, and usually several times over. The largest stone on record here is 4.5 inches, a softball and 4.5 times the National Weather Service's 1 inch severe criterion, reported on 2011-05-25 near Sunset Hills.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Missouri. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-04-27, around Bridgeton. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls St. Louis 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 67 separate hail days here since 2010 -- 3.9 a year over 17 years of record. Those days carry 513 separate reports between them, better than three on a typical one. No year since 2010 has gone by without at least one. The busiest single year was 2011, with 8 hail days. The last five years track the long-run rate, with 19 days since 2022.
13 of the 67 days reached 2 inches or more -- 19%, or about one hail day in 5, the last on 2025-05-19. Those big days do not follow the county's usual calendar: most of them fall in May, not April. 29 of the 67 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Missouri, see the Missouri hail map and history.
Reports cluster nearest Florissant -- 15 of the county's 67 hail days -- then Maryland Heights (13), Oakville (13), Chesterfield (11) and Ballwin (10). Beyond those, NOAA names Bridgeton, Mehlville, Hazelwood, Eureka, Manchester, Creve Coeur, Valley Park, Brentwood and University City on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Florissant | 10 | 2.00″ |
| Oakville | 9 | 2.00″ |
| Maryland Heights | 7 | 2.00″ |
| University City | 7 | 2.00″ |
| Ballwin | 7 | 1.75″ |
The season runs March through July: 56 of the 67 hail days on record fall in those 5 months (84%). April is the single busiest month, with 22 of them (33%). That peak sits inside the window rather than at either end. October are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| January | 1 |
| February | 1 |
| March | 7 |
| April | 22 |
| May | 13 |
| June | 8 |
| July | 6 |
| August | 3 |
| September | 3 |
| November | 1 |
| December | 2 |
That day put 6 reports on the map, the biggest 1.5 inches near Bridgeton. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-27 | 1.50″ | 6 |
| 2026-04-26 | 1.75″ | 5 |
| 2026-04-17 | 1.00″ | 1 |
| 2025-05-19 | 2.00″ | 13 |
| 2025-05-16 | 2.50″ | 35 |
| 2025-04-02 | 1.00″ | 2 |
| 2025-03-14 | 2.00″ | 43 |
| 2024-05-26 | 2.50″ | 51 |
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 4.5 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: St. Louis City (26 hail days), St. Charles County (55) and Jefferson County (53). St. Louis County takes more hail than any of them.
St. Louis City · St. Charles County · Jefferson County
Back to the Missouri hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, St. Louis County, Missouri only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.