Hail History

Hail history for Great Falls, Montana

NOAA hail reports in and within about 5 km (3 miles) of Great Falls since 1955, with preliminary reports to November 3, 2026.

Readout · Great Falls

Last hail
Jul 31, 2025
1.00 in, quarter size
Hail days, last 5 years
4
since Nov 3, 2021 · 16 reports
Largest ever
2.50 in
tennis ball · Jul 7, 2022

65 reports on 41 days since 1955 · #2 of 111 Montana places

Hail map · Great Falls

Great Falls Malmstrom AFB Vaughn Sun River Simms Raynesford Monarch 20 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
65 most recent reports with a location; Cascade County is shaded. Open street map

For homeowners

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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 Great Falls is from July 31, 2025. A local roofer can check and document it at no cost.

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What the record says about Great Falls

The latest hail report in and around Great Falls is from July 31, 2025, 1.00 in (quarter size). Since November 3, 2021 there have been 4 separate hail days; the biggest stones in that time were 2.50 in on July 7, 2022.

Over the 20 years 2006–2025, Great Falls logged 37 reports on 16 hail days, about 1.9 reports a year. That is 4.1 times the median Montana town on this site (0.5 a year) and ranks #2 of 111 Montana cities and towns on this site for all-time reports. Great Falls accounts for 25% of the 256 reports filed in Cascade County.

6% of reports with a size were 2 inches (hen egg) or larger, against 8% for the median Montana town on this site. The largest hail on record here is 2.50 in (tennis ball) on July 7, 2022 near 1.97 NW Great Falls.

Reports were up 108% in 2016–2025 (25) compared with 2006–2015 (12). The busiest year was 2014, with 9 reports on 2 days. Hail here peaks in June (32% of reports); 54% fall between April and June.

Reports a year 2006–2025 average

  • Great Falls 1.9
  • Cascade County 6.7
  • Median Montana town on this site 0.5

Hail days 2006–2025

  • Great Falls 16
  • Cascade County 51
  • Median Montana town on this site 7

Share 2 in or larger of sized reports

  • Great Falls 6%
  • Cascade County 7%
  • Median Montana town on this site 8%

Hail over time

0369 1955: 1 reports, largest 0.75 in 1958: 2 reports, largest 0.75 in 1960 1963: 1 reports, largest 0.75 in 1965: 1 reports, largest 0.75 in 1967: 1 reports, largest 0.75 in 1970: 1 reports, largest 0.88 in 1970 1976: 2 reports, largest 0.75 in 1978: 1 reports, largest 1.00 in 1979: 1 reports, largest 1.00 in 1980 1982: 1 reports, largest 2.50 in 1985: 2 reports, largest 1.00 in 1987: 1 reports, largest 1.00 in 1988: 1 reports, largest 0.75 in 1990 1992: 1 reports, largest 1.25 in 1997: 3 reports, largest 1.25 in 1998: 1 reports, largest 0.75 in 2000: 4 reports, largest 2.00 in 2000 2003: 2 reports, largest 1.25 in 2004: 1 reports, largest 1.50 in 2007: 2 reports, largest 1.75 in 2010 2013: 1 reports, largest 1.00 in 2014: 9 reports, largest 1.00 in 2016: 3 reports, largest 1.50 in 2017: 2 reports, largest 1.00 in 2019: 3 reports, largest 1.00 in 2020 2021: 1 reports, largest 1.00 in 2022: 8 reports, largest 2.50 in 2023: 1 reports, largest 1.00 in 2025: 7 reports, largest 1.00 in
Reports per year, 1955–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0102030 Jan Feb Mar April: 1 reports (2%) Apr May: 13 reports (20%) May June: 21 reports (32%) Jun July: 18 reports (28%) Jul August: 11 reports (17%) Aug September: 1 reports (2%) Sep Oct Nov Dec
All 65 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 61 7
2024 0
2023 1 1
2022 8 8
2021 1 1
2020 0
2019 21 3
2018 0
2017 11 2

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Jul 31, 2025 1 1.00 in —
Jun 15, 2025 6 1.00 in —
Jun 5, 2023 1 1.00 in —
Jul 7, 2022 8 2.50 in —

Largest hail on record

Largest hail reports in Great Falls
Date Size Location County Time · source
Jul 7, 2022 2.50 intennis ball 1.97 NW Great Falls Cascade 16:45 local · NCEI
Aug 11, 1982 2.50 intennis ball — Cascade 17:30 local · NCEI
Jul 7, 2022 2.00 inhen egg 0.69 N Great Falls Cascade 16:48 local · NCEI
Jul 8, 2000 2.00 inhen egg Great Falls Cascade 17:00 local · NCEI
Jul 7, 2022 1.75 ingolf ball 4.15 N Black Eagle Cascade 16:49 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

Most recent reports

Most recent hail reports in Great Falls
Date Size Location County Time · source
Jul 31, 2025 1.00 inquarter 1.4 W Great Falls Cascade 20:10 local · NCEI
Jun 15, 2025 1.00 inquarter 0.93 W Great Falls Cascade 15:10 local · NCEI
Jun 15, 2025 1.00 inquarter 0.83 NE Great Falls Cascade 15:06 local · NCEI
Jun 15, 2025 1.00 inquarter 1.16 NW Great Falls Cascade 15:05 local · NCEI
Jun 15, 2025 1.00 inquarter 1.4 W Great Falls Cascade 15:00 local · NCEI
Jun 15, 2025 1.00 inquarter 0.83 NE Great Falls Cascade 15:00 local · NCEI
Jun 15, 2025 1.00 inquarter 1.38 N Great Falls Cascade 14:40 local · NCEI
Jun 5, 2023 1.00 inquarter 2.33 W (Gfa)malmstrom Afb Cascade 18:19 local · NCEI
Jul 7, 2022 1.50 inping pong ball 1.46 NNW Great Falls Cascade 17:00 local · NCEI
Jul 7, 2022 1.00 inquarter 0.69 N Black Eagle Cascade 16:50 local · NCEI
Jul 7, 2022 1.75 ingolf ball 4.15 N Black Eagle Cascade 16:49 local · NCEI
Jul 7, 2022 1.25 inhalf dollar 1.67 NW Great Falls Cascade 16:48 local · NCEI

Hail history near Great Falls

Questions about hail in Great Falls

How often does it hail in Great Falls, Montana?

65 hail reports have been logged in and within about 5 km (3 miles) of Great Falls since 1955. Over the 20 years 2006–2025 that averages 1.9 reports a year. That ranks #2 of 111 Montana places by number of reports.

When is hail season in Great Falls?

Most reports come in June, July, May. June alone accounts for 32% of all reports.

What is the largest hail recorded in Great Falls?

2.50 in (tennis ball size) on July 7, 2022 near 1.97 NW Great Falls. 6% of reports here were 2 inches or larger.

When did it last hail in Great Falls?

The most recent report in this data is from July 31, 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 Great Falls had in the last five years?

4 separate days with hail reports since November 3, 2021, adding up to 16 reports. The most recent was July 31, 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.