Hail history for Jefferson County, Montana
Every NOAA hail report filed in Jefferson County since 1959, with preliminary National Weather Service reports to November 3, 2026.
Readout · Jefferson County
- Last hail
- Jul 16, 2026
- 1.00 in, quarter size
- Hail days, last 5 years
- 5
- since Nov 3, 2021 · 5 reports
- Largest ever
- 2.00 in
- hen egg · Jun 25, 1996
57 reports on 38 days since 1959 · #45 of 57 Montana counties
Hail map · Jefferson County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
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What the record says about Jefferson County
The latest hail report in Jefferson County is from July 16, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 5 separate hail days; the biggest stones in that time were 1.00 in on July 16, 2026.
Over the 20 years 2006–2025, Jefferson County logged 41 reports on 24 hail days, about 2.0 reports a year. That is 33% less than the median Montana county (3.0 a year) and ranks #45 of 57 Montana counties for all-time reports. Jefferson County holds 1% of all 8,453 hail reports in Montana.
4% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Montana county. The largest hail on record here is 2.00 in (hen egg) on June 25, 1996 near Clancy.
Reports held about level in 2016–2025 (20) compared with 2006–2015 (21). The busiest year was 2019, with 10 reports on 4 days. Hail here peaks in July (40% of reports); 32% fall between April and June.
Reports a year 2006–2025 average
- Jefferson County 2.0
- Median Montana county 3.0
Hail days 2006–2025
- Jefferson County 24
- Median Montana county 31
Share 2 in or larger of sized reports
- Jefferson County 4%
- Median Montana county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 1 | |||||||||||
| 2025 | 1 | 1 | |||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 2 | 2 | |||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 1 | 3 | 6 | 10 | |||||||||
| 2018 | 2 | 1 | 3 | ||||||||||
| 2017 | 1 | 1 | 2 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 16, 2026 | 1 | 1.00 in | — |
| Jul 28, 2025 | 1 | 1.00 in | — |
| Jul 6, 2023 | 1 | 1.00 in | — |
| Jul 24, 2022 | 1 | 1.00 in | — |
| Jul 6, 2022 | 1 | 0.88 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 25, 1996 | 2.00 inhen egg | Clancy | 17:35 local · NCEI |
| Jun 21, 1976 | 2.00 inhen egg | — | 16:10 local · NCEI |
| Aug 4, 2001 | 1.75 ingolf ball | Basin | 13:30 local · NCEI |
| Jul 3, 1998 | 1.75 ingolf ball | 2 N Clancy | 18:35 local · NCEI |
| Aug 10, 2019 | 1.50 inping pong ball | Whitehall | 17:28 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 12 21%
- 1–2 in 43 75%
- 2 in + 2 4%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 16, 2026 | 1.00 inquarter | 1.46 NNW Clancy | 13:30 local · NCEI |
| Jul 28, 2025 | 1.00 inquarter | 4.8 NE Clancy | 13:36 local · NCEI |
| Jul 6, 2023 | 1.00 inquarter | 0.48 E Basin | 11:29 local · NCEI |
| Jul 24, 2022 | 1.00 inquarter | 0.69 N Boulder | 13:08 local · NCEI |
| Jul 6, 2022 | 0.88 innickel | Basin | 15:28 local · NCEI |
| Aug 10, 2019 | 1.50 inping pong ball | Whitehall | 17:28 local · NCEI |
| Aug 10, 2019 | 1.50 inping pong ball | 5 NNW Whitehall | 17:26 local · NCEI |
| Aug 10, 2019 | 1.50 inping pong ball | 15 N Cardwell | 17:25 local · NCEI |
| Aug 10, 2019 | 1.50 inping pong ball | 7 S Boulder | 17:00 local · NCEI |
| Aug 10, 2019 | 1.00 inquarter | 14 SSW Basin | 16:30 local · NCEI |
| Aug 10, 2019 | 1.00 inquarter | 7 NW Corbin | 16:26 local · NCEI |
| Jul 16, 2019 | 1.00 inquarter | 4.81 SSW Homestake | 18:40 local · NCEI |
Cities and towns in Jefferson County
| Place | Reports | Largest |
|---|---|---|
| Basin | 10 | 1.75 in |
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Montana City | 9 | 6 | Jul 28, 2025 |
| Whitehall | 9 | 8 | Aug 10, 2019 |
| Clancy | 5 | 5 | Jul 16, 2026 |
| Boulder | 4 | 4 | Jul 24, 2022 |
| Rader Creek | 3 | 2 | Aug 18, 2007 |
| Cardwell | 2 | 2 | Jul 16, 2019 |
| Jefferson City | 2 | 2 | Jun 16, 2005 |
| South Hills | 2 | 2 | Jul 17, 2013 |
Questions about hail in Jefferson County
How often does it hail in Jefferson County, Montana?
57 hail reports have been logged in Jefferson County since 1959. Over the 20 years 2006–2025 that averages 2.0 reports a year. That ranks #45 of 57 Montana counties by number of reports.
When is hail season in Jefferson County?
Most reports come in July, August, June. July alone accounts for 40% of all reports.
What is the largest hail recorded in Jefferson County?
2.00 in (hen egg size) on June 25, 1996 near Clancy. 4% of reports here were 2 inches or larger.
When did it last hail in Jefferson County?
The most recent report in this data is from July 16, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Jefferson County had in the last five years?
5 separate days with hail reports since November 3, 2021, adding up to 5 reports. The most recent was July 16, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.