Jefferson County was hit as recently as 2026-06-26, 35 days ago. Jefferson County is hit in most years, and usually several times over. 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 2017-05-08 near Wheat Ridge.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Colorado. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-26, around Westminster. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jefferson 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 51 separate hail days here since 2010 -- 3.0 a year over 17 years of record. Those days carry 186 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 2014, with 9 hail days. The last five years track the long-run rate, with 13 days since 2022.
6 of the 51 days reached 2 inches or more -- 12%, or about one hail day in 8, the last on 2023-06-22. They land in the same month as everything else, June. Golf-ball size is rarer still: 1.75 inches or more on 12 of the 51 days.
Across the whole of Colorado, see the Colorado hail map and history.
Reports cluster nearest Lakewood -- 14 of the county's 51 hail days -- then Golden (9), Arvada (9), Evergreen (9) and Wheat Ridge (5). Beyond those, NOAA names Ken Caryl, Morrison, Westminster, Chatfield Reservo, Conifer, Columbine, Aspen Park, Edgewater and Idledale on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Lakewood | 6 | 1.50″ |
| Arvada | 4 | 1.50″ |
| 2 NNW Golden | 3 | 1.75″ |
| 3 NW Columbine | 3 | 1.75″ |
| 2 S Lakewood | 3 | 1.00″ |
The season runs May through August: 49 of the 51 hail days on record fall in those 4 months (96%). June is the single busiest month, with 17 of them (33%). That peak sits inside the window rather than at either end. Hail has also been reported in September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 10 |
| June | 17 |
| July | 11 |
| August | 11 |
| September | 2 |
That day put 1 report on the map, the biggest 1 inch near Westminster. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-26 | 1.00″ | 1 |
| 2026-06-08 | 1.75″ | 13 |
| 2025-08-23 | 1.50″ | 4 |
| 2025-07-06 | 1.50″ | 2 |
| 2024-06-29 | 1.00″ | 2 |
| 2024-05-30 | 1.25″ | 2 |
| 2023-08-01 | 1.25″ | 4 |
| 2023-07-08 | 1.25″ | 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 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: Denver County (36 hail days), Boulder County (35) and Douglas County (82). Jefferson County sits in between.
Denver County · Boulder County · Douglas County
Back to the Colorado hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Jefferson County, Colorado only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.