The most recent reported hail day was 2026-04-17, 105 days ago. Jones County is hit in most years. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2026-04-14 near Onslow.
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 Cascade. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jones 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 21 separate hail days here since 2010 -- 1.2 a year over 17 years of record. Those days carry 44 separate reports between them, two or three on a typical one. 5 of those 17 years produced none at all. The busiest single year was 2026, with 3 hail days. The last five years track the long-run rate, with 8 days since 2022.
3 of the 21 days reached 2 inches or more -- 14%, or about one hail day in 7, the last on 2026-04-14. They land in the same month as everything else, April. 8 of the 21 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 Anamosa -- 6 of the county's 21 hail days -- then Olin (4), Monticello (4), Martelle (4) and Center Junction (3).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Olin | 3 | 1.75″ |
| 1 N Martelle | 3 | 1.50″ |
| Anamosa | 3 | 1.50″ |
| 1 ENE Anamosa | 3 | 1.00″ |
| Monticello | 2 | 1.75″ |
The season runs March through June: 18 of the 21 hail days on record fall in those 4 months (86%). April is the single busiest month, with 6 of them (29%). That peak sits inside the window rather than at either end. Hail has also been reported in July, August and September, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 6 |
| May | 6 |
| June | 4 |
| July | 1 |
| August | 1 |
| September | 1 |
That day put 1 report on the map, the biggest 1 inch near Cascade. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-17 | 1.00″ | 1 |
| 2026-04-14 | 3.00″ | 4 |
| 2026-03-10 | 1.25″ | 1 |
| 2024-05-27 | 1.25″ | 2 |
| 2024-05-21 | 1.75″ | 2 |
| 2023-04-19 | 1.00″ | 2 |
| 2023-04-04 | 1.00″ | 2 |
| 2022-03-05 | 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 3 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: Linn County (38 hail days), Cedar County (24) and Delaware County (16). Jones County sits in between.
Linn County · Cedar County · Delaware 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, Jones County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.