Grimes County, Texas

What hazards hit Grimes County most?

The most frequent records are severe thunderstorm wind events: 84 since 1957. The rank column places the county among Texas's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Grimes County had?

NOAA records 15 tornadoes in Grimes County from 1954 to 2025, the strongest rated EF2, with 0 deaths and 2 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 15 tornadoes whose track touched Grimes County since 1950 (NOAA's county records number 15, the same count); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in Texas.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Grimes County?

The most recent record with damage, injuries or deaths is the April 28, 2024 tornado ($47,000 in damage in 2025 dollars).

NWS Storm survey found EF1 tornado damage along a path across portions of northern Grimes and southern Madison counties, generally parallel and to the west of SH 90 between Bedias and Madisonville. Damage included trees downed and uprooted, and there was also some roof damage to a few homes.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1177191)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

A damage figure marked "step" is a record from before 1993: NOAA then filed damage by category, and the figure is the category as entered, in the dollars of that year, not an estimate of the loss.

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Grimes County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

Records by month in Grimes County. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Grimes County

FEMA's register lists 28 declarations that include Grimes County: 18 major disasters, 8 emergencies and 2 fire management assistance declarations. Most were for flood (7) and hurricane (7).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Grimes County had?

NOAA's Storm Events Database holds 49 flood or flash flood records for Grimes County from 1997 to 2024, on 39 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Grimes County ranks 1366th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $1.4 million on 89 claims filed in Grimes County; the most in one year was 25 in 2016. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Grimes County

FEMA's National Risk Index rates Grimes County Relatively Low overall, with an expected annual loss of $14.4 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Grimes County

1. Montgomery County 641
2. Brazos County 508
3. Walker County 343
4. Washington County 263
5. Grimes County 253
6. Madison County 245
7. Waller County 204

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in TexasEvery Texas tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in TexasThe state's severe thunderstorm wind events, by county, year and month
• The Texas recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Grimes CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Grimes County's FEMA declarations (CSV)28 rows: every declaration that named the county, for your own analysis