Hail history for Lewis and Clark County, Montana
Every NOAA hail report filed in Lewis and Clark County since 1955, with preliminary National Weather Service reports to November 3, 2026.
Readout · Lewis and Clark County
- Last hail
- Sep 13, 2026
- 0.50 in, marble size · preliminary
- Hail days, last 5 years
- 6
- since Nov 3, 2021 · 11 reports
- Largest ever
- 3.00 in
- teacup · Jun 6, 1997
121 reports on 80 days since 1955 · #27 of 57 Montana counties
Hail map · Lewis and Clark 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 Lewis and Clark County
The latest hail report in Lewis and Clark County is from September 13, 2026, 0.50 in (marble size). Since November 3, 2021 there have been 6 separate hail days; the biggest stones in that time were 1.50 in on August 6, 2024.
Over the 20 years 2006–2025, Lewis and Clark County logged 46 reports on 28 hail days, about 2.3 reports a year. That is 25% less than the median Montana county (3.0 a year) and ranks #27 of 57 Montana counties for all-time reports. Lewis and Clark 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 3.00 in (teacup) on June 6, 1997 near 3 N Helena.
Reports were down 52% in 2016–2025 (15) compared with 2006–2015 (31). The busiest year was 2001, with 12 reports on 5 days. Hail here peaks in June (35% of reports); 45% fall between April and June.
Reports a year 2006–2025 average
- Lewis and Clark County 2.3
- Median Montana county 3.0
Hail days 2006–2025
- Lewis and Clark County 28
- Median Montana county 31
Share 2 in or larger of sized reports
- Lewis and Clark County 7%
- Median Montana county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 3 | 3 | 6 | ||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 2 | 2 | |||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 3 | 3 | |||||||||||
| 2021 | 2 | 2 | |||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 2 | 2 | |||||||||||
| 2017 | 3 | 3 |
Hail days since Nov 3, 2021
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 6, 1997 | 3.00 inteacup | 3 N Helena | 14:35 local · NCEI |
| Jun 28, 1982 | 3.00 inteacup | — | 18:30 local · NCEI |
| Jun 28, 1982 | 3.00 inteacup | — | 17:10 local · NCEI |
| Jul 1, 1975 | 3.00 inteacup | — | 17:30 local · NCEI |
| Jun 30, 1975 | 2.75 inbaseball | — | 19:42 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 33 27%
- 1–2 in 79 65%
- 2 in + 9 7%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Sep 13, 2026 | 0.50 inmarble | 1 E East Helena | 00:12 UTC · NWS prelim. |
| Sep 6, 2026 | 1.00 inquarter | Wolf Creek | 00:30 UTC · NWS prelim. |
| Sep 6, 2026 | 0.70 inmarble | 3 SW Craig | 00:30 UTC · NWS prelim. |
| Jun 25, 2026 | 1.00 inquarter | 1.17 NW East Helena | 13:33 local · NCEI |
| Jun 25, 2026 | 1.00 inquarter | 2.02 WNW (Hln)helena Rgnl Arp | 13:18 local · NCEI |
| Jun 25, 2026 | 1.00 inquarter | 0.84 NW Iron | 13:09 local · NCEI |
| Aug 6, 2024 | 1.00 inquarter | 2.74 WNW Marysville | 17:15 local · NCEI |
| Aug 6, 2024 | 1.50 inping pong ball | 1.46 SSE Silver City | 16:45 local · NCEI |
| Jul 9, 2022 | 0.75 inpenny | 3.58 SSW Austin | 14:40 local · NCEI |
| Jul 8, 2022 | 1.00 inquarter | 2.74 WNW Marysville | 17:30 local · NCEI |
| Jul 8, 2022 | 1.00 inquarter | 17.3 WNW Augusta | 16:42 local · NCEI |
| Jul 21, 2021 | 1.00 inquarter | 19 WNW Augusta | 20:00 local · NCEI |
Cities and towns in Lewis and Clark County
| Place | Reports | Largest |
|---|---|---|
| Helena | 27 | 3.00 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 |
|---|---|---|---|
| Wolf Creek | 9 | 9 | Sep 6, 2026 |
| Helena Valley West Central | 7 | 7 | Jun 25, 2026 |
| Lincoln | 7 | 7 | Jun 8, 2017 |
| Helena Valley Northwest | 6 | 6 | Aug 6, 2024 |
| Helena West Side | 6 | 5 | Aug 15, 2014 |
| Augusta | 5 | 5 | May 26, 2018 |
| East Helena | 5 | 5 | Jun 25, 2026 |
| Helena Valley Northeast | 5 | 4 | Jun 13, 2014 |
| Marysville | 5 | 5 | Aug 6, 2024 |
| Canyon Creek | 3 | 2 | May 31, 2018 |
| Craig | 3 | 3 | Sep 6, 2026 |
| Helena Valley Southeast | 3 | 3 | Sep 13, 2026 |
| Gilman | 1 | 1 | Jun 5, 2005 |
Questions about hail in Lewis and Clark County
How often does it hail in Lewis and Clark County, Montana?
121 hail reports have been logged in Lewis and Clark County since 1955. Over the 20 years 2006–2025 that averages 2.3 reports a year. That ranks #27 of 57 Montana counties by number of reports.
When is hail season in Lewis and Clark County?
Most reports come in June, July, August. June alone accounts for 35% of all reports.
What is the largest hail recorded in Lewis and Clark County?
3.00 in (teacup size) on June 6, 1997 near 3 N Helena. 7% of reports here were 2 inches or larger.
When did it last hail in Lewis and Clark County?
The most recent report in this data is from September 13, 2026 (0.50 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Lewis and Clark County had in the last five years?
6 separate days with hail reports since November 3, 2021, adding up to 11 reports. The most recent was September 13, 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.