Grant County, Nebraska · Hyannis
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Grant County averages 80 nights a year at 20°F or colder, mostly November to April, and 50% of its homes predate 1960.
May brings the most downpours to Grant County, part of 2.9 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Grant County gets about 2.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Grant County, 1.86 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
65% of occupied homes in Grant County heat mainly with wood or propane, above the Nebraska county median of 19.4%.
About 2 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 626 people live in Grant County, 777 square miles in western Nebraska, in roughly 407 homes. The county seat is Hyannis. Half the homes here were built before 1960, half after.
52/100 Water Damage Risk Index: Elevated Grant County ranks 36 of 93 Nebraska counties. See the statewide ranking and method.The three factors where Grant County ranks highest compared with other Nebraska counties.
Grant County gets more hard-freeze nights than most of Nebraska. In the 2015–2024 record the county logged about 80 nights a year at or below 20°F (3rd of 93) and 171 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 22 days below freezing (ending March 2019), and the low bottomed out near -24°F on February 15, 2021.
Expect the hardest freezes in January, inside a season that runs November to April. 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 Oct 7 and end around May 14.
Grant gets fewer downpours than most Nebraska counties, but they still fill basements. The county gets about 21.3 inches of rain and melted snow a year, with 2.9 days of an inch or more (75th of 93). Those downpours cluster in April, May and June, when sump pumps and gutters are tested hardest. The wettest day on record brought 1.86 inches on June 14, 2016. The worst three-day stretch dropped 3.48 inches, ending May 13, 2023, the kind of soaking that overwhelms sump pumps and storm sewers.
About 138 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
73% of homes in Grant County predate 1980, close to the Nebraska county median of 73.1%, which ranks 49th of Nebraska's 93 counties.
The mix runs from 50% built before 1960 to 15% built since 2000, so older neighborhoods bring aging pipe while newer subdivisions bring failed appliance lines and water heaters.
7% of homes are manufactured or mobile homes, above the Nebraska county median of 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.
The Census counted 30% of homes as vacant, above the Nebraska county median of 14.2%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
About 2 nights a year in Grant County stay at 65°F or warmer, a sign of muggy summer air (86th of 93 counties). May 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: 5% utility gas, 28% electric, 62% propane and 3% wood. Propane heat is 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
Grant gets more pipe-freeze nights than any of its neighbors. Sheridan County has the oldest housing nearby, with 87% of homes built before 1980.
By the numbers
| Factor | Grant | Nebraska median | Rank |
|---|---|---|---|
| Homes built before 1960 | 50% | 49% | 41 of 93 |
| Homes built before 1980 | 73% | 73% | 49 of 93 |
| Homes built 2000 or later | 15% | 12% | 31 of 93 |
| Manufactured or mobile homes | 7.1% | 5% | 27 of 93 |
| Vacant homes | 30% | 14% | 8 of 93 |
| Wood or propane heat | 65% | 19% | 9 of 93 |
| Nights at 20°F or colder | 80/yr | 64/yr | 3 of 93 |
| Days with 1 inch+ of rain | 2.9/yr | 5.1/yr | 75 of 93 |
| Freeze-thaw days | 138/yr | 112/yr | 9 of 93 |
| Muggy nights (65°F+) | 2/yr | 27/yr | 86 of 93 |
Rank 1 is the highest value. Bars run from the lowest to the highest Nebraska 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 November to April, heavy rain in April, May and June.
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