Hail History

Hail history for Silver Bow County, Montana

Every NOAA hail report filed in Silver Bow County since 1958, with preliminary National Weather Service reports to November 3, 2026.

Readout · Silver Bow County

Last hail
Jul 16, 2026
2.00 in, hen egg size
Hail days, last 5 years
1
since Nov 3, 2021 · 2 reports
Largest ever
2.50 in
tennis ball · Aug 6, 2009

45 reports on 30 days since 1958 · #49 of 57 Montana counties

Hail map · Silver Bow County

Butte-Silver Bow 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
44 most recent reports with a location. Dot size and colour follow hail size. Open street map

For homeowners

Roof damage after hail? Get a free inspection

Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Silver Bow County is from July 16, 2026. A local roofer can check and document it at no cost.

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What the record says about Silver Bow County

The latest hail report in Silver Bow County is from July 16, 2026, 2.00 in (hen egg size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 2.00 in on July 16, 2026.

Over the 20 years 2006–2025, Silver Bow County logged 26 reports on 13 hail days, about 1.3 reports a year. That is about half the median Montana county (3.0 a year) and ranks #49 of 57 Montana counties for all-time reports. Silver Bow County holds 1% of all 8,453 hail reports in Montana.

7% 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 August 6, 2009 near 2.81 S Rocker.

Reports were down 47% in 2016–2025 (9) compared with 2006–2015 (17). The busiest year was 2009, with 8 reports on 1 day. Hail here peaks in August (47% of reports); 20% fall between April and June.

Reports a year 2006–2025 average

  • Silver Bow County 1.3
  • Median Montana county 3.0

Hail days 2006–2025

  • Silver Bow County 13
  • Median Montana county 31

Share 2 in or larger of sized reports

  • Silver Bow County 7%
  • Median Montana county 7%

Hail over time

02468 1958: 2 reports, largest ? in 1960 1970 1975: 2 reports, largest 1.50 in 1976: 1 reports, largest 1.00 in 1980: 1 reports, largest 1.25 in 1980 1987: 1 reports, largest 1.50 in 1990 1995: 1 reports, largest 0.01 in 1996: 1 reports, largest 0.75 in 1997: 1 reports, largest 1.00 in 2000 2001: 1 reports, largest 1.50 in 2002: 2 reports, largest 1.00 in 2004: 1 reports, largest 0.75 in 2005: 3 reports, largest 1.75 in 2007: 1 reports, largest 0.88 in 2008: 4 reports, largest 1.25 in 2009: 8 reports, largest 2.50 in 2010 2011: 1 reports, largest 1.00 in 2013: 1 reports, largest 1.00 in 2014: 2 reports, largest 1.00 in 2016: 1 reports, largest 1.25 in 2017: 3 reports, largest 1.25 in 2019: 5 reports, largest 1.50 in 2020 2026: 2 reports, largest 2.00 in
Reports per year, 1958–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0102030 Jan Feb Mar Apr May: 2 reports (4%) May June: 7 reports (16%) Jun July: 14 reports (31%) Jul August: 21 reports (47%) Aug September: 1 reports (2%) Sep Oct Nov Dec
All 45 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 2 2
2025 0
2024 0
2023 0
2022 0
2021 0
2020 0
2019 23 5
2018 0
2017 3 3

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Jul 16, 2026 2 2.00 in —

Largest hail on record

Largest hail reports in Silver Bow County
Date Size Location Damage Time · source
Aug 6, 2009 2.50 intennis ball 2.81 S Rocker — 14:00 local · NCEI
Jul 16, 2026 2.00 inhen egg 12.14 NNW Maiden Rock — 16:37 local · NCEI
Aug 6, 2009 2.00 inhen egg 1.92 E (Btm)mooney Arpt But $50K 14:10 local · NCEI
Aug 6, 2009 1.75 ingolf ball 11.8 NW Maiden Rock — 13:15 local · NCEI
Jun 16, 2005 1.75 ingolf ball Rocker $5K 15:48 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Silver Bow County
Date Size Location Time · source
Jul 16, 2026 2.00 inhen egg 12.14 NNW Maiden Rock 16:37 local · NCEI
Jul 16, 2026 1.00 inquarter 0.44 SE Butte 16:30 local · NCEI
Aug 10, 2019 1.00 inquarter Butte 15:53 local · NCEI
Aug 10, 2019 1.00 inquarter 11.28 NW Maiden Rock 15:15 local · NCEI
Aug 10, 2019 1.50 inping pong ball 1 WNW Ramsay 14:51 local · NCEI
Jul 30, 2019 1.00 inquarter 2.04 SW Newcomb 16:00 local · NCEI
Jul 16, 2019 1.00 inquarter 8.05 NNW Maiden Rock 20:10 local · NCEI
Jul 10, 2017 1.00 inquarter 2 SW Newcomb 15:30 local · NCEI
Jul 10, 2017 1.25 inhalf dollar 6 SE Janney 14:29 local · NCEI
Jul 10, 2017 1.00 inquarter 16 SE Janney 13:07 local · NCEI
Aug 7, 2016 1.25 inhalf dollar 2 SW Newcomb 15:00 local · NCEI
Aug 15, 2014 1.00 inquarter 2 SSE Butte 11:54 local · NCEI

Cities and towns in Silver Bow County

PlaceReportsLargest
Butte-Silver Bow502.75 in

Questions about hail in Silver Bow County

How often does it hail in Silver Bow County, Montana?

45 hail reports have been logged in Silver Bow County since 1958. Over the 20 years 2006–2025 that averages 1.3 reports a year. That ranks #49 of 57 Montana counties by number of reports.

When is hail season in Silver Bow County?

Most reports come in August, July, June. August alone accounts for 47% of all reports.

What is the largest hail recorded in Silver Bow County?

2.50 in (tennis ball size) on August 6, 2009 near 2.81 S Rocker. 7% of reports here were 2 inches or larger.

When did it last hail in Silver Bow County?

The most recent report in this data is from July 16, 2026 (2.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has Silver Bow County had in the last five years?

1 separate days with hail reports since November 3, 2021, adding up to 2 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.