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Flood in Cascade County, Montana
32 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 32 flood events in Cascade County, Montana, between 1950 and 2026, spread over 12 years.
June is the busiest month, with 17 of the recorded events. The last 20 years account for 28 events against 4 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 2.7% of the 1,175 flood events recorded in Montana; its 1.2 per 100 square miles compares with 0.8 statewide.
NCEI attributes 2 deaths in the county to floods and flash floods.
Compared with Montana
| Measure | Cascade County | Montana | US |
|---|---|---|---|
| Flood events since 1950 | 32 | 1,175 | 183,559 |
| Per 100 square miles | 1.2 | 0.8 | 5.2 |
| Per 10,000 residents | 3.8 | 10.6 | 5.5 |
| Deaths recorded | 2 | 9 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
0Feb
0Mar
1Apr
0May
7Jun
17Jul
3Aug
3Sep
0Oct
0Nov
0Dec
1
Recorded events
All 32 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 31 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 5 Jun 2023 | Flash Flood | — | $50K | $20K | — | — | County |
| 17 May 2023 | Flood | — | $60K | — | 2 | — | County |
| 6 May 2023 | Flood | — | — | — | — | — | County |
| 3 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 23 Jul 2020 | Flood | — | — | — | — | — | County |
| 21 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 6 Jul 2019 | Flash Flood | — | — | — | — | — | County |
| 27 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 27 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 27 Jun 2019 | Flood | — | — | — | — | — | County |
| 27 Jun 2019 | Flood | — | — | — | — | — | County |
| 27 Jun 2019 | Flood | — | — | — | — | — | County |
| 27 May 2019 | Flood | — | — | — | — | — | County |
| 25 Jun 2018 | Flash Flood | — | — | — | — | — | County |
| 23 Jun 2018 | Flash Flood | — | — | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 19 Jun 2018 | Flood | — | — | — | — | — | County |
| 9 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 9 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 6 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2011 | Flood | — | — | — | — | — | County |
| 21 May 2011 | Flood | — | — | — | — | — | County |
| 21 May 2011 | Flood | — | — | — | — | — | County |
| 21 May 2011 | Flood | — | — | — | — | — | County |
| 14 Mar 2011 | Flood | — | — | — | — | — | County |
| 20 Dec 2010 | Flood | — | — | — | — | — | County |
| 3 Jun 2005 | Flood | — | $80K | — | — | — | Forecast zone |
| 10 May 2005 | Flood | — | — | — | — | — | Forecast zone |
| 19 Jun 2003 | Flash Flood | — | $250K | — | — | — | County |
| 10 Jun 2002 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Cascade County had?
32 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Cascade County?
31 Jul 2025 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Cascade County?
The flash flood of 19 Jun 2003, with property damage estimated by NCEI at $250K.
How does Cascade County compare with Montana for flood?
1.2 events per 100 square miles against 0.8 statewide; the county holds 32 of the state's 1,175 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.