The most recent reported hail day was 2026-04-17, 105 days ago. Jasper County has recorded hail in nearly every year on the archive. The largest stone on record here is 2.75 inches, a baseball and 2.8 times the National Weather Service's 1 inch severe criterion, reported on 2023-05-07 near Baxter.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Iowa. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-04-17, around Lambs Grove. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jasper 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 33 separate hail days here since 2010 -- 1.9 a year over 17 years of record. Those days carry 80 separate reports between them, two or three on a typical one. 2 of those 17 years produced none at all. The busiest single year was 2024, with 5 hail days. The last five years track the long-run rate, with 12 days since 2022.
5 of the 33 days reached 2 inches or more -- 15%, or about one hail day in 7, the last on 2023-05-07. Those big days do not follow the county's usual calendar: most of them fall in June, not April. 11 of the 33 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Newton -- 7 of the county's 33 hail days -- then Baxter (6), Monroe (6), Lambs Grove (5) and Colfax (4). Beyond those, NOAA names Prairie City, Kellogg, Sully, Collins, Reasnor, Valeria, Newton Airport, Gilman and Mingo on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Baxter | 6 | 2.75″ |
| Monroe | 5 | 2.50″ |
| Newton | 4 | 2.75″ |
| Prairie City | 4 | 1.50″ |
| Colfax | 3 | 1.75″ |
The season runs April through September: 31 of the 33 hail days on record fall in those 6 months (94%). April is the single busiest month, with 9 of them (27%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in March, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 9 |
| May | 6 |
| June | 4 |
| July | 4 |
| August | 3 |
| September | 5 |
That day put 10 reports on the map, the biggest 1.75 inches near Lambs Grove. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-17 | 1.75″ | 10 |
| 2025-04-17 | 1.00″ | 1 |
| 2025-03-29 | 1.00″ | 1 |
| 2024-07-30 | 1.75″ | 4 |
| 2024-07-28 | 1.75″ | 2 |
| 2024-07-15 | 1.00″ | 1 |
| 2024-05-23 | 1.50″ | 1 |
| 2024-04-27 | 1.50″ | 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 2.75 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: Marshall County (26 hail days), Marion County (30) and Poweshiek County (21). Jasper County takes more hail than any of them.
Marshall County · Marion County · Poweshiek County
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Jasper County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.