Grant County, Kentucky · Williamstown
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Grant County averages 22 nights a year at 20°F or colder, mostly December to March, and 11% of its homes predate 1960.
February brings the most downpours to Grant County, part of 9.9 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Grant County gets about 9.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Grant County, 3.07 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
21% of occupied homes in Grant County heat mainly with wood or propane, above the Kentucky county median of 12.6%.
About 61 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
About 25,418 people live in Grant County, 258 square miles in northern Kentucky, in roughly 10,245 homes. The county seat is Williamstown, and Crittenden, Dry Ridge and Corinth round out the largest towns. Much of its housing is recent, with a median build year of 1990.
45/100 Water Damage Risk Index: Elevated Grant County ranks 82 of 120 Kentucky counties. See the statewide ranking and method.The three factors where Grant County ranks highest compared with other Kentucky counties.
Grant County gets more hard-freeze nights than most of Kentucky. In the 2015–2024 record the county logged about 22 nights a year at or below 20°F (16th of 120) and 84 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 13 days below freezing (ending January 2018), and the low bottomed out near -12°F on February 21, 2015.
Expect the hardest freezes in January, inside a season that runs December to March. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
Freezing nights typically start around Nov 4 and end around Apr 8.
Grant gets fewer downpours than most Kentucky counties, but they still fill basements. The county gets about 49.8 inches of rain and melted snow a year, with 9.9 days of an inch or more (89th of 120). Those downpours cluster in February, March and July, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.07 inches on July 31, 2020. The worst three-day stretch dropped 4.03 inches, ending September 10, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
About 71 days a year swing from below freezing at night to above freezing by day. Those freeze-thaw cycles feed ice dams on roofs, open cracks in foundations and driveways, and stress pipes that are already marginal.
Housing
35% of homes in Grant County predate 1980, below the Kentucky county median of 44.1%, which ranks 96th of Kentucky's 120 counties.
The mix runs from 11% built before 1960 to 24% built since 2000, so older neighborhoods bring aging pipe while newer subdivisions bring failed appliance lines and water heaters.
The 1980s and 1990s account for 41% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
22% of homes are manufactured or mobile homes, above the Kentucky county median of 18.5%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
Beyond water
About 61 nights a year in Grant County stay at 65°F or warmer, a sign of muggy summer air (44th of 120 counties). July is the wettest month. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectMain heating fuel in Grant County's occupied homes: 14% utility gas, 58% electric, 17% propane and 4% wood. Wood and propane heat are more common here than the state median. Have chimneys swept and fuel-burning appliances serviced each fall, and keep three feet clear around stoves and space heaters.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Grant County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Kenton gets more pipe-freeze nights than Grant. Kenton County has the oldest housing nearby, with 58% of homes built before 1980.
By the numbers
| Factor | Grant | Kentucky median | Rank |
|---|---|---|---|
| Homes built before 1960 | 11% | 18% | 99 of 120 |
| Homes built before 1980 | 35% | 44% | 96 of 120 |
| Homes built 2000 or later | 24% | 25% | 65 of 120 |
| Manufactured or mobile homes | 22% | 19% | 47 of 120 |
| Vacant homes | 10% | 13% | 87 of 120 |
| Wood or propane heat | 21% | 13% | 37 of 120 |
| Nights at 20°F or colder | 22/yr | 20/yr | 16 of 120 |
| Days with 1 inch+ of rain | 9.9/yr | 12/yr | 89 of 120 |
| Freeze-thaw days | 71/yr | 73/yr | 73 of 120 |
| Muggy nights (65°F+) | 61/yr | 59/yr | 44 of 120 |
Rank 1 is the highest value. Bars run from the lowest to the highest Kentucky county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Grant County: freezing from December to March, heavy rain in February, March and July.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology