Grant County, Indiana · Marion
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Grant County averages 33 nights a year at 20°F or colder, mostly November to March, and 45% of its homes predate 1960.
June brings the most downpours to Grant County, part of 6.1 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Grant County gets about 6.1 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Grant County, 2.45 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
7% of occupied homes in Grant County heat mainly with wood or propane, below the Indiana county median of 17%.
About 35 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 66,295 people live in Grant County, 414 square miles in northeast Indiana, in roughly 29,907 homes. The county seat is Marion, and Gas City, Upland and Fairmount round out the largest towns. Half the homes here were built before 1963, half after.
52/100 Water Damage Risk Index: Elevated Grant County ranks 40 of 92 Indiana counties. See the statewide ranking and method.The three factors where Grant County ranks highest compared with other Indiana counties.
Pipe-freeze risk in Grant County sits near the middle of the state. In the 2015–2024 record the county logged about 33 nights a year at or below 20°F (44th of 92) and 109 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 19 days below freezing (ending March 2015), and the low bottomed out near -14°F on January 2, 2018.
Expect the hardest freezes in January, inside a season that runs November 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 Oct 24 and end around Apr 23.
Grant gets fewer downpours than most Indiana counties, but they still fill basements. The county gets about 40.5 inches of rain and melted snow a year, with 6.1 days of an inch or more (71st of 92). Those downpours cluster in May, June and July, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.45 inches on June 27, 2015. The worst three-day stretch dropped 3.64 inches, ending September 23, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
About 81 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, above the Indiana county median of 58.2%, which ranks 8th of Indiana's 92 counties.
Before 1960 is when 45% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
Beyond water
About 35 nights a year in Grant County stay at 65°F or warmer, a sign of muggy summer air (56th of 92 counties). June 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: 56% utility gas, 36% electric, 5% propane and 2% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
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
Blackford, Howard, Miami, Tipton, Wabash and Wells get more pipe-freeze nights than Grant. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Grant | Indiana median | Rank |
|---|---|---|---|
| Homes built before 1960 | 45% | 35% | 16 of 92 |
| Homes built before 1980 | 73% | 58% | 8 of 92 |
| Homes built 2000 or later | 10% | 18% | 83 of 92 |
| Manufactured or mobile homes | 5.8% | 6.4% | 48 of 92 |
| Vacant homes | 11% | 9.2% | 29 of 92 |
| Wood or propane heat | 6.9% | 17% | 75 of 92 |
| Nights at 20°F or colder | 33/yr | 33/yr | 44 of 92 |
| Days with 1 inch+ of rain | 6.1/yr | 7.8/yr | 71 of 92 |
| Freeze-thaw days | 81/yr | 84/yr | 62 of 92 |
| Muggy nights (65°F+) | 35/yr | 38/yr | 56 of 92 |
Rank 1 is the highest value. Bars run from the lowest to the highest Indiana 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 March, heavy rain in May, June 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