States › Montana › Valley County › Flood
Flood in Valley County, Montana
117 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.
Valley County, Montana, has 117 flood events in the NCEI record since 1950, with at least one in 18 different years.
June is the busiest month, with 37 of the recorded events. The last 20 years account for 97 events against 20 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 10% of the 1,175 flood events recorded in Montana; its 2.4 per 100 square miles compares with 0.8 statewide.
Compared with Montana
| Measure | Valley County | Montana | US |
|---|---|---|---|
| Flood events since 1950 | 117 | 1,175 | 183,559 |
| Per 100 square miles | 2.4 | 0.8 | 5.2 |
| Per 10,000 residents | 155.2 | 10.6 | 5.5 |
| Deaths recorded | 0 | 9 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
0Feb
0Mar
12Apr
23May
21Jun
37Jul
10Aug
8Sep
3Oct
3Nov
0Dec
0
Recorded events
All 117 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 |
|---|---|---|---|---|---|---|---|
| 12 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2023 | Flood | — | — | — | — | — | County |
| 2 Jun 2023 | Flash Flood | — | — | — | — | — | County |
| 2 Jun 2023 | Flash Flood | — | — | — | — | — | County |
| 2 Jun 2023 | Flash Flood | — | — | — | — | — | County |
| 25 May 2023 | Flash Flood | — | — | — | — | — | County |
| 12 Apr 2023 | Flood | — | — | — | — | — | County |
| 12 Apr 2023 | Flood | — | — | — | — | — | County |
| 12 Apr 2023 | Flood | — | — | — | — | — | County |
| 11 Apr 2023 | Flood | — | — | — | — | — | County |
| 10 Apr 2023 | Flood | — | — | — | — | — | County |
| 1 Apr 2020 | Flood | — | — | — | — | — | County |
| 31 Mar 2020 | Flood | — | — | — | — | — | County |
| 7 Mar 2020 | Flood | — | — | — | — | — | County |
| 6 Mar 2020 | Flood | — | — | — | — | — | County |
| 1 Mar 2020 | Flood | — | — | — | — | — | County |
| 23 Aug 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 24 Mar 2019 | Flood | — | — | — | — | — | County |
| 23 Mar 2019 | Flood | — | — | — | — | — | County |
| 23 Mar 2019 | Flood | — | — | — | — | — | County |
| 23 Mar 2019 | Flood | — | — | — | — | — | County |
| 21 Mar 2019 | Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 25 Apr 2018 | Flood | — | — | — | — | — | County |
| 18 Apr 2018 | Flood | — | — | — | — | — | County |
| 18 Apr 2018 | Flood | — | — | — | — | — | County |
| 17 Apr 2018 | Flood | — | — | — | — | — | County |
| 17 Apr 2018 | Flood | — | — | — | — | — | County |
| 16 Apr 2018 | Flood | — | — | — | — | — | County |
| 3 Apr 2018 | Flood | — | — | — | — | — | County |
| 6 Oct 2016 | Flood | — | — | — | — | — | County |
| 6 Oct 2016 | Flood | — | — | — | — | — | County |
| 5 Oct 2016 | Flood | — | — | — | — | — | County |
| 2 Jul 2016 | Flash Flood | — | — | — | — | — | County |
| 11 May 2016 | Flood | — | — | — | — | — | County |
| 3 Sep 2014 | Flood | — | — | — | — | — | County |
| 1 Sep 2014 | Flood | — | — | — | — | — | County |
| 1 Sep 2014 | Flood | — | — | — | — | — | County |
| 26 Aug 2014 | Flood | — | — | — | — | — | County |
| 26 Aug 2014 | Flood | — | — | — | — | — | County |
| 24 Aug 2014 | Flood | — | — | — | — | — | County |
| 24 Aug 2014 | Flood | — | — | — | — | — | County |
| 24 Aug 2014 | Flood | — | $1.1M | — | — | — | County |
| 24 Aug 2014 | Flash Flood | — | $150K | — | — | — | County |
| 6 Jun 2013 | Flood | — | — | — | — | — | County |
| 4 Jun 2013 | Flood | — | — | — | — | — | County |
| 4 Jun 2013 | Flood | — | — | — | — | — | County |
| 25 May 2013 | Flash Flood | — | — | — | — | — | County |
| 22 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 22 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 20 Jun 2011 | Flood | — | — | — | — | — | County |
| 17 Jun 2011 | Flood | — | — | — | — | — | County |
| 17 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2011 | Flood | — | — | — | — | — | County |
| 11 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2011 | Flood | — | — | — | — | — | County |
| 7 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 5 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 30 May 2011 | Flood | — | — | — | — | — | County |
| 25 May 2011 | Flood | — | — | — | — | — | County |
| 23 May 2011 | Flood | — | — | — | — | — | County |
| 22 May 2011 | Flood | — | — | — | — | — | County |
| 20 May 2011 | Flood | — | — | — | — | — | County |
| 18 May 2011 | Flood | — | — | — | — | — | County |
| 11 May 2011 | Flood | — | — | — | — | — | County |
| 10 May 2011 | Flood | — | — | — | — | — | County |
| 10 May 2011 | Flood | — | — | — | — | — | County |
| 1 May 2011 | Flood | — | — | — | — | — | County |
| 1 May 2011 | Flood | — | — | — | — | — | County |
| 21 Apr 2011 | Flood | — | — | — | — | — | County |
| 13 Apr 2011 | Flood | — | — | — | — | — | County |
| 8 Apr 2011 | Flood | — | — | — | — | — | County |
| 7 Apr 2011 | Flood | — | — | — | — | — | County |
| 6 Apr 2011 | Flood | — | — | — | — | — | County |
| 5 Apr 2011 | Flood | — | — | — | — | — | County |
| 4 Apr 2011 | Flood | — | — | — | — | — | County |
| 23 Mar 2011 | Flood | — | — | — | — | — | County |
| 28 Jul 2010 | Flash Flood | — | — | — | — | — | County |
| 27 May 2010 | Flash Flood | — | $1K | — | — | — | County |
| 16 Jun 2007 | Flash Flood | — | $50K | — | — | — | County |
| 16 Jun 2007 | Flash Flood | — | — | — | — | — | County |
| 16 Jun 2007 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2007 | Flood | — | — | — | — | — | County |
| 22 May 2007 | Flood | — | — | — | — | — | County |
| 23 May 2006 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 25 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 21 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 21 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2005 | Flash Flood | — | $200K | — | — | — | County |
| 7 Jun 2005 | Flash Flood | — | $75K | — | — | — | County |
| 6 Jun 2005 | Flash Flood | — | $75K | — | — | — | County |
| 21 Aug 2002 | Flash Flood | — | $20K | — | — | — | County |
| 24 Jul 2001 | Flash Flood | — | — | — | — | — | County |
| 12 Jul 2001 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2000 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2000 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 1999 | Flash Flood | — | — | — | — | — | County |
| 29 Mar 1999 | Flood | — | — | — | — | — | Forecast zone |
| 15 Mar 1999 | Flood | — | $20K | — | — | — | County |
| 16 Jun 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Valley County had?
117 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 Valley County?
12 Jul 2024 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Valley County?
The flood of 24 Aug 2014, with property damage estimated by NCEI at $1.1M.
How does Valley County compare with Montana for flood?
2.4 events per 100 square miles against 0.8 statewide; the county holds 117 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.