The most recent reported hail day was 2025-07-18, 378 days ago. Converse County is hit in most years, and usually several times over. The largest stone on record here is 4 inches, a grapefruit and 4 times the National Weather Service's 1 inch severe criterion, reported on 2017-06-12 near Douglas.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Wyoming. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2025-07-18, around Lost Springs. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Converse 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 44 separate hail days here since 2010 -- 2.6 a year over 17 years of record. They carry 73 reports in total: most hail days here are logged from a single spot. 2 of those 17 years produced none at all. One year dominates the record: 2023 alone produced 9 of the 44 days. The last five years track the long-run rate, with 13 days since 2022.
5 of the 44 days reached 2 inches or more -- 11%, or about one hail day in 9, the last on 2023-07-06. Those big days do not follow the county's usual calendar: most of them fall in June, not July. 15 of the 44 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Wyoming, see the Wyoming hail map and history.
Reports cluster nearest Douglas -- 15 of the county's 44 hail days -- then Bill (11), Dull Center (7), Glenrock (7) and Lost Springs (4). Beyond those, NOAA names Esterbrook on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Douglas | 7 | 2.00″ |
| Bill | 5 | 2.75″ |
| 1 E Dull Center | 3 | 1.25″ |
| Lost Springs | 3 | 1.00″ |
| 2 E Douglas | 2 | 2.00″ |
The season runs May through July: 39 of the 44 hail days on record fall in those 3 months (89%). July is the single busiest month, with 18 of them (41%). That peak closes the window: the season builds all the way to its worst month and then stops. Hail has also been reported in August and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 6 |
| June | 15 |
| July | 18 |
| August | 3 |
| September | 2 |
That day put 1 report on the map, the biggest 1 inch near Lost Springs. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-07-18 | 1.00″ | 1 |
| 2025-06-16 | 1.75″ | 3 |
| 2024-07-01 | 1.00″ | 1 |
| 2023-09-22 | 1.00″ | 1 |
| 2023-09-09 | 1.75″ | 4 |
| 2023-07-14 | 1.25″ | 2 |
| 2023-07-08 | 1.75″ | 3 |
| 2023-07-06 | 2.00″ | 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 4 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: Niobrara County (59 hail days), Natrona County (35) and Platte County (77). Converse County sits in between.
Niobrara County · Natrona County · Platte County
Back to the Wyoming hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Converse County, Wyoming only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.