Union County was hit as recently as 2026-06-10, 51 days ago. Union County has recorded hail in nearly every year on the archive. 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 2021-06-18 near Lorimor.
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 2026-06-10, around Creston. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Union 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 30 separate hail days here since 2010 -- 1.8 a year over 17 years of record. Those days carry 56 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 2011, with 4 hail days. The last five years track the long-run rate, with 9 days since 2022.
5 of the 30 days reached 2 inches or more -- 17%, or about one hail day in 6, the last on 2022-03-05. They land in the same month as everything else, June. 12 of the 30 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 Creston -- 16 of the county's 30 hail days -- then Lorimor (5), Afton (5), Creston Airport (4) and Cromwell (4). That one town is named on 53% of them. Beyond those, NOAA names Ne Arispe and Arispe on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Creston | 8 | 1.75″ |
| Afton | 4 | 1.00″ |
| Lorimor | 3 | 3.00″ |
| Ne Arispe | 3 | 1.75″ |
| 3 E Creston | 2 | 2.00″ |
The season runs April through June: 25 of the 30 hail days on record fall in those 3 months (83%). June is the single busiest month, with 14 of them (47%). That peak closes the window: the season builds all the way to its worst month and then stops. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| March | 1 |
| April | 4 |
| May | 7 |
| June | 14 |
| July | 1 |
| August | 1 |
| September | 1 |
That day put 2 reports on the map, the biggest 1 inch near Creston. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-10 | 1.00″ | 2 |
| 2025-04-17 | 1.00″ | 3 |
| 2024-05-21 | 1.25″ | 1 |
| 2024-04-30 | 1.75″ | 7 |
| 2023-07-17 | 1.00″ | 1 |
| 2023-06-17 | 1.00″ | 2 |
| 2023-05-07 | 1.00″ | 1 |
| 2022-09-17 | 1.75″ | 3 |
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: Adair County (28 hail days), Adams County (20) and Ringgold County (21). Union County takes more hail than any of them.
Adair County · Adams County · Ringgold 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, Union County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.