Hail history for Sweet Grass County, Montana
Every NOAA hail report filed in Sweet Grass County since 1955, with preliminary National Weather Service reports to November 3, 2026.
Readout · Sweet Grass County
- Last hail
- Jun 16, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 3
- since Nov 3, 2021 · 3 reports
- Largest ever
- 2.50 in
- tennis ball · Jun 13, 2013
130 reports on 62 days since 1955 · #24 of 57 Montana counties
Hail map · Sweet Grass 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 Sweet Grass County
The latest hail report in Sweet Grass County is from June 16, 2025, 1.00 in (quarter size). Since November 3, 2021 there have been 3 separate hail days; the biggest stones in that time were 1.25 in on June 14, 2025.
Over the 20 years 2006–2025, Sweet Grass County logged 97 reports on 36 hail days, about 4.8 reports a year. That is 59% more than the median Montana county (3.0 a year) and ranks #24 of 57 Montana counties for all-time reports. Sweet Grass County holds 2% of all 8,453 hail reports in Montana.
3% 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 2.50 in (tennis ball) on June 13, 2013 near 21.97 E Melville.
Reports were down 63% in 2016–2025 (26) compared with 2006–2015 (71). The busiest year was 2010, with 18 reports on 5 days. Hail here peaks in June (38% of reports); 54% fall between April and June.
Reports a year 2006–2025 average
- Sweet Grass County 4.8
- Median Montana county 3.0
Hail days 2006–2025
- Sweet Grass County 36
- Median Montana county 31
Share 2 in or larger of sized reports
- Sweet Grass County 3%
- Median Montana county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 2 | 2 | |||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 1 | 1 | |||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 2 | 2 | |||||||||||
| 2019 | 3 | 8 | 11 | ||||||||||
| 2018 | 1 | 2 | 2 | 5 | |||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jun 16, 2025 | 1 | 1.00 in | — |
| Jun 14, 2025 | 1 | 1.25 in | — |
| Jul 4, 2022 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 13, 2013 | 2.50 intennis ball | 21.97 E Melville | 16:35 local · NCEI |
| Jun 6, 2011 | 2.00 inhen egg | 0.48 E Big Timber | 18:18 local · NCEI |
| Jul 1, 2010 | 2.00 inhen egg | 9.43 NNW Big Timber | 15:10 local · NCEI |
| Jun 15, 1956 | 2.00 inhen egg | — | 14:30 local · NCEI |
| Aug 11, 2019 | 1.75 ingolf ball | Big Timber | 16:27 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 44 34%
- 1–2 in 80 63%
- 2 in + 4 3%
- No size 2
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 16, 2025 | 1.00 inquarter | Big Timber | 14:44 local · NCEI |
| Jun 14, 2025 | 1.25 inhalf dollar | 21.97 E Melville | 16:20 local · NCEI |
| Jul 4, 2022 | 1.00 inquarter | 5.61 N Big Timber | 23:18 local · NCEI |
| May 19, 2020 | 0.75 inpenny | 3.2 WNW Greycliff | 19:42 local · NCEI |
| May 19, 2020 | 0.75 inpenny | 9.88 ENE Melville | 18:00 local · NCEI |
| Aug 11, 2019 | 1.00 inquarter | 0.48 E Big Timber | 16:31 local · NCEI |
| Aug 11, 2019 | 1.00 inquarter | 0.69 N Big Timber | 16:30 local · NCEI |
| Aug 11, 2019 | 1.75 ingolf ball | Big Timber | 16:27 local · NCEI |
| Aug 11, 2019 | 0.75 inpenny | 5.91 WNW Melville | 14:56 local · NCEI |
| Aug 11, 2019 | 1.00 inquarter | 5.91 WNW Melville | 14:16 local · NCEI |
| Aug 11, 2019 | 1.00 inquarter | 4.79 W Melville | 13:56 local · NCEI |
| Aug 10, 2019 | 0.88 innickel | 13.85 ENE Melville | 16:43 local · NCEI |
Cities and towns in Sweet Grass County
| Place | Reports | Largest |
|---|---|---|
| Big Timber | 36 | 2.00 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 |
|---|---|---|---|
| Greycliff | 2 | 2 | Jun 6, 2011 |
Questions about hail in Sweet Grass County
How often does it hail in Sweet Grass County, Montana?
130 hail reports have been logged in Sweet Grass County since 1955. Over the 20 years 2006–2025 that averages 4.8 reports a year. That ranks #24 of 57 Montana counties by number of reports.
When is hail season in Sweet Grass County?
Most reports come in June, July, August. June alone accounts for 38% of all reports.
What is the largest hail recorded in Sweet Grass County?
2.50 in (tennis ball size) on June 13, 2013 near 21.97 E Melville. 3% of reports here were 2 inches or larger.
When did it last hail in Sweet Grass County?
The most recent report in this data is from June 16, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Sweet Grass County had in the last five years?
3 separate days with hail reports since November 3, 2021, adding up to 3 reports. The most recent was June 16, 2025.
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.