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Flood in Johnson County, Kansas
109 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 109 flood events in Johnson County, Kansas, between 1950 and 2026, spread over 27 years.
June is the busiest month, with 32 of the recorded events. The last 20 years account for 61 events against 48 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 2.4% of the 4,604 flood events recorded in Kansas; its 23.0 per 100 square miles compares with 5.6 statewide.
NCEI attributes 3 deaths in the county to floods and flash floods.
Compared with Kansas
| Measure | Johnson County | Kansas | US |
|---|---|---|---|
| Flood events since 1950 | 109 | 4,604 | 183,559 |
| Per 100 square miles | 23.0 | 5.6 | 5.2 |
| Per 10,000 residents | 1.8 | 15.7 | 5.5 |
| Deaths recorded | 3 | 32 | 2,961 |
| Busiest month | June | May | June |
By year
Seasonality
0Feb
2Mar
5Apr
6May
11Jun
32Jul
23Aug
22Sep
6Oct
2Nov
0Dec
0
Recorded events
All 109 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 |
|---|---|---|---|---|---|---|---|
| 17 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 17 Jul 2025 | Flash Flood | — | $10K | — | — | — | County |
| 1 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 14 Jul 2023 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2021 | Flash Flood | — | — | — | — | — | County |
| 28 May 2020 | Flash Flood | — | — | — | — | — | County |
| 30 Apr 2019 | Flash Flood | — | — | — | — | — | County |
| 30 Apr 2019 | Flash Flood | — | — | — | — | — | County |
| 22 Aug 2017 | Flood | — | — | — | — | — | County |
| 21 Aug 2017 | Flash Flood | — | — | — | — | — | County |
| 5 Aug 2017 | Flash Flood | — | — | — | — | — | County |
| 5 Aug 2017 | Flash Flood | — | — | — | — | — | County |
| 5 Aug 2017 | Flash Flood | — | — | — | — | — | County |
| 5 Aug 2017 | Flash Flood | — | — | — | — | — | County |
| 27 Jul 2017 | Flash Flood | — | — | — | — | — | County |
| 9 Sep 2016 | Flash Flood | — | — | — | — | — | County |
| 9 Sep 2016 | Flood | — | — | — | — | — | County |
| 9 Sep 2016 | Flood | — | — | — | — | — | County |
| 26 May 2016 | Flash Flood | — | — | — | — | — | County |
| 23 May 2016 | Flash Flood | — | — | — | — | — | County |
| 10 Sep 2015 | Flash Flood | — | — | — | — | — | County |
| 20 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 20 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 20 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2015 | Flash Flood | — | — | — | — | — | County |
| 16 May 2015 | Flash Flood | — | — | — | — | — | County |
| 3 Sep 2014 | Flash Flood | — | — | — | — | — | County |
| 27 Apr 2014 | Flood | — | — | — | — | — | County |
| 19 Sep 2013 | Flood | — | — | — | — | — | County |
| 15 Jun 2013 | Flood | — | — | — | — | — | County |
| 31 May 2013 | Flash Flood | — | — | — | — | — | County |
| 6 May 2012 | Flash Flood | — | — | — | — | — | County |
| 20 Jul 2010 | Flash Flood | — | — | — | — | — | County |
| 20 Jul 2010 | Flash Flood | — | — | — | — | — | County |
| 16 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 14 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 12 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 17 Aug 2009 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 2009 | Flash Flood | — | — | — | — | — | County |
| 30 Jul 2008 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2008 | Flood | — | — | — | — | — | County |
| 3 Jun 2008 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2008 | Flood | — | — | — | — | — | County |
| 3 Jun 2008 | Flood | — | — | — | — | — | County |
| 3 Jun 2008 | Flash Flood | — | — | — | — | — | County |
| 2 Jun 2008 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2007 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2007 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2007 | Flash Flood | — | — | — | — | — | County |
| 30 Jun 2007 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 2007 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 2007 | Flash Flood | — | — | — | — | — | County |
| 6 May 2007 | Flash Flood | — | — | — | — | — | County |
| 25 Apr 2007 | Flash Flood | — | — | — | — | — | County |
| 1 Mar 2007 | Flash Flood | — | — | — | — | — | County |
| 1 Mar 2007 | Flash Flood | — | — | — | — | — | County |
| 28 Feb 2007 | Flash Flood | — | — | — | — | — | County |
| 28 Feb 2007 | Flash Flood | — | — | — | — | — | County |
| 27 Aug 2006 | Flash Flood | — | — | — | — | — | County |
| 27 Aug 2006 | Flash Flood | — | — | — | — | — | County |
| 27 Aug 2006 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 2006 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 2006 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 2006 | Flash Flood | — | — | — | — | — | County |
| 20 Aug 2005 | Flash Flood | — | — | — | — | — | County |
| 19 Aug 2005 | Flash Flood | — | — | — | — | — | County |
| 19 Aug 2005 | Flash Flood | — | — | — | — | — | County |
| 13 Aug 2005 | Flash Flood | — | — | — | — | — | County |
| 4 Jun 2005 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 28 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 27 Aug 2004 | Flood | — | — | — | — | — | Forecast zone |
| 27 Aug 2004 | Flash Flood | — | $500K | — | — | — | County |
| 27 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 24 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 23 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2004 | Flood | — | — | — | — | — | Forecast zone |
| 16 Jul 2004 | Flash Flood | — | — | — | — | — | County |
| 6 Jul 2004 | Flash Flood | — | — | — | — | — | County |
| 19 May 2004 | Flash Flood | — | — | — | — | — | County |
| 19 May 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Mar 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Mar 2004 | Flash Flood | — | — | — | — | — | County |
| 31 Aug 2003 | Flash Flood | — | — | — | 1 | — | County |
| 22 Jun 2003 | Flash Flood | — | — | — | — | — | County |
| 11 May 2002 | Flash Flood | — | — | — | — | — | County |
| 5 Jun 2001 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2001 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2001 | Flash Flood | — | $5K | — | — | — | County |
| 20 Jun 2000 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 1999 | Flash Flood | — | $500K | — | — | — | County |
| 28 Jun 1999 | Flood | — | — | — | — | — | Forecast zone |
| 23 Jun 1999 | Flood | — | $50K | — | — | — | County |
| 22 Apr 1999 | Flood | — | $25K | — | — | — | County |
| 4 Oct 1998 | Flash Flood | — | $8.0M | — | 2 | — | County |
| 4 Oct 1998 | Flood | — | — | — | — | — | Forecast zone |
| 30 Jul 1998 | Flood | — | — | — | — | — | County |
| 30 Jul 1998 | Flood | — | — | — | — | — | Forecast zone |
| 29 Jun 1998 | Flood | — | — | — | — | — | Forecast zone |
| 29 Jun 1998 | Flash Flood | — | — | — | — | — | County |
| 16 Jun 1997 | Flood | — | — | — | — | — | County |
| 11 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 24 Mar 1997 | Flash Flood | — | — | — | — | — | County |
| 29 Jul 1996 | Flood | — | — | — | — | — | County |
| 5 Jun 1996 | Flash Flood | — | — | — | — | — | County |
| 7 May 1996 | Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Johnson County had?
109 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 Johnson County?
17 Jul 2025 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Johnson County?
The flash flood of 4 Oct 1998, with property damage estimated by NCEI at $8.0M; 2 deaths recorded.
How does Johnson County compare with Kansas for flood?
23.0 events per 100 square miles against 5.6 statewide; the county holds 109 of the state's 4,604 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.