Jefferson County, Colorado: hail history 2014–2026
The National Weather Service logged 209 hail reports in Jefferson County between January 2014 and June 2026. On 45 days the largest stone was an inch or bigger, the size NWS calls severe. The biggest was 2.75 inches, about the size of a baseball, reported on May 8, 2017 near Edgewater. June is the peak month (40% of reports).
- 209hail reports, 2014–2026
- 45days with hail of 1 in or more
- 9days with hail of 1.75 in or more (golf ball)
- 2.75 inlargest stone reported
Has severe hail hit Jefferson County since my roof was put on?
Our record covers 2014–2026 only. A roof older than 2014 has also been through hail we do not show here. A day counts when at least one report of 1 inch or larger was filed in the county, so it does not mean your own roof was hit; an inspection is the only way to know.
Year by year
| Year | Reports | Days 1 in+ | Days 1.75 in+ | Largest |
|---|---|---|---|---|
| 2014 | 23 | 9 | 1 | 1.75 in |
| 2015 | 13 | 5 | 0 | 1.5 in |
| 2016 | 14 | 3 | 1 | 1.75 in |
| 2017 | 20 | 1 | 1 | 2.75 in |
| 2018 | 16 | 6 | 2 | 2 in |
| 2019 | 15 | 4 | 0 | 1.5 in |
| 2020 | 2 | 1 | 0 | 1.25 in |
| 2021 | 15 | 2 | 1 | 2 in |
| 2022 | 2 | 1 | 0 | 1.25 in |
| 2023 | 46 | 6 | 2 | 2.5 in |
| 2024 | 9 | 2 | 0 | 1.25 in |
| 2025 | 12 | 2 | 0 | 1.5 in |
| 2026 (Jan–Jun) | 22 | 3 | 1 | 1.75 in |
When hail hits: reports by month
| Jan | 0 |
|---|---|
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 48 |
| Jun | 84 |
| Jul | 29 |
| Aug | 39 |
| Sep | 9 |
| Oct | 0 |
| Nov | 0 |
| Dec | 0 |
June alone has 40% of the 209 reports. Book an inspection before the first month with reports so crews still have dates.
Where hail of 1 inch or more was reported in Jefferson County
- 1 to 1.74 in
- 1.75 to 2.74 in (golf ball to tennis ball)
- 2.75 in and up (baseball)
171 reports of 1 inch or larger have coordinates; the map shows the 140 largest. Each dot is a place a spotter, a trained observer or the public reported hail, not a measured storm path.
Sources: NOAA Storm Events (report locations) · US Census cartographic boundary (county outline, public domain)The ten biggest hail days
| Date | Largest hail | Reports | Where |
|---|---|---|---|
| May 8, 2017 | 2.75 in, a baseball | 18 | Edgewater · $2,300 million damage reported |
| June 22, 2023 | 2.5 in, a tennis ball | 20 | Indian Hills |
| August 19, 2021 | 2 in, a hen egg | 12 | Golden |
| June 21, 2023 | 2 in, a hen egg | 11 | Idledale |
| June 18, 2018 | 2 in, a hen egg | 3 | Jefferson Co Arpt |
| June 8, 2026 | 1.75 in, a golf ball | 18 | Kittredge |
| July 7, 2014 | 1.75 in, a golf ball | 4 | Arvada |
| June 20, 2016 | 1.75 in, a golf ball | 1 | Pine |
| July 27, 2018 | 1.75 in, a golf ball | 1 | Buffalo Creek |
| June 5, 2014 | 1.5 in, a ping-pong ball | 5 | Columbine |
“Up to 2.5 inches hail occurred in the populated areas of Jefferson County. An EF1 tornado touched down just south of CO-470 in the city of Highlands Ranch. Preliminarily the tornado was on the ground for 6.3 miles. Some window/shingle damage has been noted to both houses and commercial properties.”
National Weather Service report, June 22, 2023
“Severe thunderstorms produced intense winds and large hail across Adams, Broomfield, Douglas, Jefferson, Morgan, Weld and Phillips counties. The hail ranged in size from one to two inches in diameter. Three short-lived brief tornadoes touched down in Phillips County.”
National Weather Service report, August 19, 2021
“Dozens were injured at Red Rocks Park when a severe thunderstorm pummeled the venue with large hail.”
National Weather Service report, June 21, 2023
Strongest thunderstorm gusts
| Date | Gust | Near |
|---|---|---|
| June 6, 2020 | 78 mph | Columbine |
| March 30, 2014 | 77 mph | Golden |
| July 7, 2014 | 70 mph | Arvada |
| June 6, 2020 | 70 mph | Morrison |
| June 24, 2020 | 67 mph | Jefferson Co Arpt |
| June 6, 2020 | 67 mph | Morrison |
Gust speeds are measured or estimated; reports in knots are converted to mph.
What to do with this
- Find the year your roof went on (closing papers, permit, a past invoice). Use the box above to see how many severe hail days it has lived through.
- After any day on the table, photograph the roof and keep the date: insurers ask for it.
- Get a free inspection from a local roofer: Arvada.
Jefferson County cities we cover
Other Colorado counties
- Weld County (480 reports)
- Larimer County (201 reports)
- Pueblo County (182 reports)
- Denver County (168 reports)
- Adams County (170 reports)
All counties: hail history hub · live hail map. Data: NOAA Storm Events Database, 2014–2026, county level, public domain. The 2026 row is partial: NOAA's file ran to June 2026 when we loaded it on 2026-10-06. Reports are filed by spotters, trained observers and the public; one storm can produce many reports. Not a forecast, not legal advice.