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Flood in Grant County, Oklahoma
46 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, Oklahoma, has 46 flood events in the NCEI record since 1950, with at least one in 13 different years.
June is the busiest month, with 8 of the recorded events. The last 20 years account for 15 events against 31 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.1% of the 4,346 flood events recorded in Oklahoma; its 4.6 per 100 square miles compares with 6.3 statewide.
Compared with Oklahoma
| Measure | Grant County | Oklahoma | US |
|---|---|---|---|
| Flood events since 1950 | 46 | 4,346 | 183,559 |
| Per 100 square miles | 4.6 | 6.3 | 5.2 |
| Per 10,000 residents | 111.4 | 10.9 | 5.5 |
| Deaths recorded | 0 | 91 | 2,961 |
| Busiest month | June | May | June |
By year
Seasonality
1Feb
0Mar
2Apr
5May
7Jun
8Jul
3Aug
6Sep
5Oct
6Nov
3Dec
0
Recorded events
All 46 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 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 21 May 2019 | Flood | — | — | — | — | — | County |
| 20 May 2019 | Flash Flood | — | — | — | — | — | County |
| 20 May 2019 | Flash Flood | — | — | — | — | — | County |
| 20 May 2019 | Flash Flood | — | — | — | — | — | County |
| 7 May 2019 | Flood | — | — | — | — | — | County |
| 6 Oct 2016 | Flash Flood | — | — | — | — | — | County |
| 6 Oct 2016 | Flash Flood | — | — | — | — | — | County |
| 4 Oct 2016 | Flash Flood | — | — | — | — | — | County |
| 17 Aug 2009 | Flash Flood | — | — | — | — | — | County |
| 13 Sep 2008 | Flood | — | — | — | — | — | County |
| 12 Sep 2008 | Flash Flood | — | — | — | — | — | County |
| 12 Sep 2008 | Flood | — | — | — | — | — | County |
| 12 Sep 2008 | Flash Flood | — | — | — | — | — | County |
| 12 Sep 2008 | Flash Flood | — | — | — | — | — | County |
| 4 Jul 2005 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jan 2005 | Flood | — | — | — | — | — | Forecast zone |
| 1 Jul 2004 | Flood | — | — | — | — | — | Forecast zone |
| 23 Apr 2004 | Flash Flood | — | — | — | — | — | County |
| 4 Mar 2004 | Flood | — | — | — | — | — | Forecast zone |
| 8 Oct 2003 | Flood | — | — | — | — | — | Forecast zone |
| 30 Aug 2003 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2003 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2003 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2003 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2003 | Flash Flood | — | — | — | — | — | County |
| 19 Mar 2003 | Flood | — | — | — | — | — | Forecast zone |
| 4 Oct 2002 | Flood | — | — | — | — | — | Forecast zone |
| 11 Apr 2002 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 1999 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 1999 | Flash Flood | — | — | — | — | — | County |
| 9 Jun 1999 | Flash Flood | — | $25K | — | — | — | County |
| 31 May 1999 | Flash Flood | — | — | — | — | — | County |
| 23 Apr 1999 | Flood | — | — | — | — | — | Forecast zone |
| 14 Apr 1999 | Flood | — | — | — | — | — | Forecast zone |
| 13 Apr 1999 | Flash Flood | — | $2K | — | — | — | County |
| 1 Nov 1998 | Flash Flood | — | — | — | — | — | County |
| 31 Oct 1998 | Flash Flood | — | — | — | — | — | County |
| 19 Jul 1997 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 7 May 1997 | Flash Flood | — | — | — | — | — | County |
| 16 Nov 1996 | Flash Flood | — | — | — | — | — | County |
| 16 Nov 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Grant County had?
46 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 Jun 2026 (Flash 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 9 Jun 1999, with property damage estimated by NCEI at $25K.
How does Grant County compare with Oklahoma for flood?
4.6 events per 100 square miles against 6.3 statewide; the county holds 46 of the state's 4,346 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.