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Flood in Grant County, Wisconsin
139 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.
Grant County, Wisconsin, has 139 flood events in the NCEI record since 1950, with at least one in 24 different years.
July is the busiest month, with 35 of the recorded events. The last 20 years account for 120 events against 19 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 5.4% of the 2,580 flood events recorded in Wisconsin; its 12.1 per 100 square miles compares with 4.8 statewide.
Compared with Wisconsin
| Measure | Grant County | Wisconsin | US |
|---|---|---|---|
| Flood events since 1950 | 139 | 2,580 | 183,559 |
| Per 100 square miles | 12.1 | 4.8 | 5.2 |
| Per 10,000 residents | 26.7 | 4.4 | 5.5 |
| Deaths recorded | 0 | 30 | 2,961 |
| Busiest month | July | June | June |
By year
Seasonality
4Feb
6Mar
6Apr
10May
7Jun
33Jul
35Aug
14Sep
16Oct
8Nov
0Dec
0
Recorded events
All 139 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 |
|---|---|---|---|---|---|---|---|
| 18 Apr 2026 | Flood | — | — | — | — | — | County |
| 18 Aug 2025 | Flood | — | — | — | — | — | County |
| 17 Aug 2025 | Flash Flood | — | $75K | — | — | — | County |
| 10 Aug 2025 | Flash Flood | — | $25K | — | — | — | County |
| 10 Aug 2025 | Flash Flood | — | $300K | — | — | — | County |
| 10 Aug 2025 | Flash Flood | — | $5K | — | — | — | County |
| 11 Jul 2025 | Flash Flood | — | $5K | — | — | — | County |
| 11 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 2025 | Flash Flood | — | $10K | — | — | — | County |
| 11 Jul 2025 | Flash Flood | — | $25K | — | — | — | County |
| 11 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 2 Jul 2024 | Flash Flood | — | $15K | $10K | — | — | County |
| 3 Jun 2024 | Flash Flood | — | — | $5K | — | — | County |
| 3 Jun 2024 | Flash Flood | — | $1K | $1K | — | — | County |
| 3 Jun 2024 | Flash Flood | — | — | — | — | — | County |
| 27 Feb 2023 | Flood | — | — | — | — | — | County |
| 8 Aug 2022 | Flash Flood | — | $10K | — | — | — | County |
| 2 Oct 2019 | Flood | — | $10K | — | — | — | County |
| 1 Oct 2019 | Flood | — | — | — | — | — | County |
| 1 Oct 2019 | Flood | — | — | — | — | — | County |
| 19 Sep 2019 | Flash Flood | — | $10K | — | — | — | County |
| 19 Sep 2019 | Flood | — | — | — | — | — | County |
| 19 Sep 2019 | Flood | — | — | — | — | — | County |
| 15 Sep 2019 | Flood | — | — | — | — | — | County |
| 15 Sep 2019 | Flood | — | — | — | — | — | County |
| 15 Sep 2019 | Flood | — | $5K | — | — | — | County |
| 12 Sep 2019 | Flash Flood | — | $35K | $2K | — | — | County |
| 12 Sep 2019 | Flood | — | — | — | — | — | County |
| 12 Sep 2019 | Flash Flood | — | $900K | — | — | — | County |
| 12 Sep 2019 | Flash Flood | — | $10K | — | — | — | County |
| 12 Sep 2019 | Flood | — | — | — | — | — | County |
| 1 Jul 2019 | Flash Flood | — | $410K | $355K | — | — | County |
| 1 Jul 2019 | Flood | — | — | — | — | — | County |
| 22 Apr 2019 | Flood | — | — | — | — | — | County |
| 13 Mar 2019 | Flood | — | $15K | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 4 Feb 2019 | Flood | — | — | — | — | — | County |
| 10 Oct 2018 | Flood | — | — | — | — | — | County |
| 8 Oct 2018 | Flood | — | — | — | — | — | County |
| 1 Oct 2018 | Flood | — | — | — | — | — | County |
| 1 Oct 2018 | Flash Flood | — | $5K | $77K | — | — | County |
| 20 Sep 2018 | Flood | — | — | — | — | — | County |
| 20 Sep 2018 | Flood | — | — | — | — | — | County |
| 20 Sep 2018 | Flood | — | $10K | $349K | — | — | County |
| 13 Jul 2018 | Flood | — | — | — | — | — | County |
| 10 Jun 2018 | Flood | — | — | — | — | — | County |
| 10 Jun 2018 | Flood | — | $3K | — | — | — | County |
| 10 Jun 2018 | Flood | — | — | — | — | — | County |
| 9 Jun 2018 | Flash Flood | — | $7K | — | — | — | County |
| 9 Jun 2018 | Flash Flood | — | $2K | — | — | — | County |
| 9 Jun 2018 | Flash Flood | — | $1K | — | — | — | County |
| 20 Feb 2018 | Flood | — | — | — | — | — | County |
| 20 Feb 2018 | Flood | — | — | — | — | — | County |
| 22 Jan 2018 | Flood | — | — | — | — | — | County |
| 22 Jan 2018 | Flood | — | — | — | — | — | County |
| 21 Jul 2017 | Flash Flood | — | $942K | $7.6M | — | — | County |
| 21 Jul 2017 | Flood | — | — | — | — | — | County |
| 21 Jul 2017 | Flood | — | — | — | — | — | County |
| 12 Jul 2017 | Flash Flood | — | $35K | $5K | — | — | County |
| 23 Jul 2016 | Flash Flood | — | — | — | — | — | County |
| 23 Jul 2016 | Flash Flood | — | $10K | — | — | — | County |
| 23 Jul 2016 | Flash Flood | — | — | — | — | — | County |
| 23 Jul 2016 | Flash Flood | — | — | — | — | — | County |
| 23 Jul 2016 | Flood | — | — | — | — | — | County |
| 23 Jul 2016 | Flash Flood | — | — | — | — | — | County |
| 23 Jul 2016 | Flood | — | — | — | — | — | County |
| 19 Feb 2016 | Flood | — | — | — | — | — | County |
| 19 Jun 2014 | Flash Flood | — | $5K | — | — | — | County |
| 19 Jun 2014 | Flood | — | — | — | — | — | County |
| 16 Jun 2014 | Flood | — | — | — | — | — | County |
| 16 Jun 2014 | Flood | — | — | — | — | — | County |
| 24 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 22 Jun 2013 | Flash Flood | — | $7.1M | — | — | — | County |
| 21 Jun 2013 | Flood | — | — | — | — | — | County |
| 12 Jun 2013 | Flood | — | — | — | — | — | County |
| 29 May 2013 | Flash Flood | — | — | — | — | — | County |
| 10 Mar 2013 | Flood | — | — | — | — | — | County |
| 10 Mar 2013 | Flood | — | — | — | — | — | County |
| 29 Jan 2013 | Flood | — | — | — | — | — | County |
| 29 Jan 2013 | Flood | — | — | — | — | — | County |
| 28 Jul 2011 | Flash Flood | — | $2K | — | — | — | County |
| 27 Jul 2011 | Flood | — | — | — | — | — | County |
| 16 Apr 2011 | Flood | — | — | — | — | — | County |
| 1 Oct 2010 | Flood | — | — | — | — | — | County |
| 28 Sep 2010 | Flood | — | — | — | — | — | County |
| 13 Aug 2010 | Flood | — | — | — | — | — | County |
| 8 Aug 2010 | Flood | — | $300K | — | — | — | County |
| 8 Aug 2010 | Flood | — | — | — | — | — | County |
| 24 Jul 2010 | Flood | — | — | — | — | — | County |
| 24 Jul 2010 | Flood | — | — | — | — | — | County |
| 24 Jul 2010 | Flash Flood | — | $8K | — | — | — | County |
| 24 Jul 2010 | Flood | — | $1.3M | — | — | — | County |
| 7 Jul 2010 | Flash Flood | — | $10K | — | — | — | County |
| 27 Jul 2009 | Flash Flood | — | $35K | $20K | — | — | County |
| 24 Jul 2009 | Flash Flood | — | $8K | $15K | — | — | County |
| 24 Jul 2009 | Flash Flood | — | $10K | $20K | — | — | County |
| 19 Jun 2009 | Flash Flood | — | $30K | $20K | — | — | County |
| 19 Jun 2009 | Flash Flood | — | $10K | $15K | — | — | County |
| 19 Jun 2009 | Flash Flood | — | $20K | $20K | — | — | County |
| 19 Jun 2009 | Flash Flood | — | $30K | $20K | — | — | County |
| 27 Apr 2009 | Flood | — | — | — | — | — | County |
| 26 Apr 2009 | Flash Flood | — | — | — | — | — | County |
| 12 Jul 2008 | Flash Flood | — | $8K | — | — | — | County |
| 10 Jul 2008 | Flash Flood | — | $75K | — | — | — | County |
| 7 Jul 2008 | Flood | — | $2K | — | — | — | County |
| 12 Jun 2008 | Flood | — | $175K | $35K | — | — | County |
| 12 Jun 2008 | Flash Flood | — | $6.5M | $445K | — | — | County |
| 8 Jun 2008 | Flood | — | $750K | $350K | — | — | County |
| 8 Jun 2008 | Flash Flood | — | $750K | $300K | — | — | County |
| 8 Jun 2008 | Flash Flood | — | $1.2M | $550K | — | — | County |
| 5 Jun 2008 | Flash Flood | — | $3K | — | — | — | County |
| 25 Apr 2008 | Flood | — | — | — | — | — | County |
| 25 Apr 2008 | Flash Flood | — | $800K | $750K | — | — | County |
| 25 Apr 2008 | Flood | — | $700K | $600K | — | — | County |
| 22 Aug 2007 | Flash Flood | — | $1K | — | — | — | County |
| 22 Aug 2007 | Flash Flood | — | $800 | — | — | — | County |
| 22 Aug 2007 | Flash Flood | — | $800 | — | — | — | County |
| 19 Aug 2007 | Flash Flood | — | $265K | $18K | — | — | County |
| 18 Jul 2007 | Flash Flood | — | $2.2M | $250K | — | — | County |
| 16 Jun 2004 | Flash Flood | — | $150K | $70K | — | — | County |
| 16 Jun 2004 | Flood | — | $100K | $50K | — | — | Forecast zone |
| 22 May 2004 | Flash Flood | — | $150K | $150K | — | — | County |
| 21 May 2004 | Flash Flood | — | $100K | $100K | — | — | County |
| 10 May 2003 | Flash Flood | — | $5K | — | — | — | County |
| 6 Jul 2002 | Flash Flood | — | $2K | $4K | — | — | County |
| 4 Jun 2002 | Flood | — | $45K | $75K | — | — | Forecast zone |
| 4 Jun 2002 | Flash Flood | — | $500K | $200K | — | — | County |
| 2 Aug 2001 | Flood | — | — | — | — | — | County |
| 1 May 2001 | Flood | — | $2.2M | — | — | — | Forecast zone |
| 13 Apr 2001 | Flood | — | $2.0M | — | — | — | Forecast zone |
| 11 Sep 2000 | Flash Flood | — | $15K | $20K | — | — | County |
| 1 Jun 2000 | Flash Flood | — | $1.2M | $1.6M | — | — | County |
| 31 May 2000 | Flash Flood | — | $50K | $35K | — | — | County |
| 16 May 1999 | Flash Flood | — | $200K | $80K | — | — | County |
| 30 Mar 1998 | Flood | — | $2K | — | — | — | County |
| 15 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 3 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 18 Feb 1997 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Grant County had?
139 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 Grant County?
18 Apr 2026 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Grant County?
The flash flood of 21 Jul 2017, with property damage estimated by NCEI at $942K and crop damage at $7.6M.
How does Grant County compare with Wisconsin for flood?
12.1 events per 100 square miles against 4.8 statewide; the county holds 139 of the state's 2,580 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.