Franklin County, Ohio · Columbus
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Franklin County averages 29 nights a year at 20°F or colder, mostly November to March, and 25% of its homes predate 1960.
Heavy rain days of an inch or more come about 5.9 times a year here, most often in March. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Franklin County gets about 5.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
Roof leaks here come from summer downpours and, with about 80 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
2% of occupied homes in Franklin County heat mainly with wood or propane, below the Ohio county median of 15.9%.
Muggy summer nights, lows of 65°F or more, come about 45 times a year in Franklin County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 595,469 homes and around 1,333,048 residents, Franklin County is 532 square miles of central Ohio. Besides Columbus, the county seat, the biggest communities are Dublin, Grove City and Reynoldsburg. The county's median home was built in 1979.
40/100 Water Damage Risk Index: Moderate Franklin County ranks 66 of 88 Ohio counties. See the statewide ranking and method.The three factors where Franklin County ranks highest compared with other Ohio counties.
For frozen pipes, Franklin County is a typical Ohio county, which is still plenty. In the 2015–2024 record the county logged about 29 nights a year at or below 20°F (56th of 88) and 101 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On February 24, 2015 the low fell to about -9°F, and in the stretch ending February 2021 the county went 15 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Most freezing nights fall from November to March, peaking in January. Disconnect garden hoses and shut off outdoor spigots before the first hard frost, and keep the heat at 55°F or higher if you'll be away.
On average the first fall freeze arrives around Oct 31 and the last spring freeze around Apr 17.
Rainfall is about average for Ohio. About 5.9 days a year bring an inch or more (38th of 88), most often in March, out of 43.2 inches of total precipitation. On June 23, 2016, 3.06 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.86 inches (through September 10, 2018).
The temperature crosses 32°F in both directions on roughly 80 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
Roughly 52% of the county's housing was built before 1980. That puts Franklin among the newer housing stocks of Ohio's 88 counties.
Since 2000 the county has added enough housing that 23% of homes are that new. Modern PEX and copper rarely fail on their own; the leaks come from connections, appliances and storms.
About 25% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Renters occupy 47% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
About 45 nights a year in Franklin County stay at 65°F or warmer, a sign of muggy summer air (10th of 88 counties). May is the wettest month. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectMain heating fuel in Franklin County's occupied homes: 67% utility gas, 31% electric, 2% propane and under 1% 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 Franklin County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Delaware, Licking, Madison and Union get more pipe-freeze nights than Franklin. Madison County has the oldest housing nearby, with 55% of homes built before 1980.
By the numbers
| Factor | Franklin | Ohio median | Rank |
|---|---|---|---|
| Homes built before 1960 | 25% | 37% | 79 of 88 |
| Homes built before 1980 | 52% | 61% | 71 of 88 |
| Homes built 2000 or later | 23% | 17% | 12 of 88 |
| Manufactured or mobile homes | 1% | 5.9% | 82 of 88 |
| Vacant homes | 7.1% | 8.4% | 55 of 88 |
| Wood or propane heat | 1.6% | 16% | 87 of 88 |
| Nights at 20°F or colder | 29/yr | 31/yr | 56 of 88 |
| Days with 1 inch+ of rain | 5.9/yr | 5.7/yr | 38 of 88 |
| Freeze-thaw days | 80/yr | 82/yr | 55 of 88 |
| Muggy nights (65°F+) | 45/yr | 35/yr | 10 of 88 |
Rank 1 is the highest value. Bars run from the lowest to the highest Ohio county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Franklin County: freezing from November to March, heavy rain in March, 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