Shelby County, Tennessee · Memphis
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With 27% of homes built before 1960 and about 6 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
March brings the most downpours to Shelby County, part of 15 heavy-rain days a year. Check the sump first.
27% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
In Shelby County, 4.8 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
1% of occupied homes in Shelby County heat mainly with wood or propane, below the Tennessee county median of 7.8%.
Muggy summer nights, lows of 65°F or more, come about 113 times a year in Shelby County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 404,333 homes and around 919,173 residents, Shelby County is 753 square miles of southwest Tennessee. Besides Memphis, the county seat, the biggest communities are Bartlett, Collierville and Germantown. The county's median home was built in 1977.
61/100 Water Damage Risk Index: Elevated Shelby County ranks 17 of 95 Tennessee counties. See the statewide ranking and method.The three factors where Shelby County ranks highest compared with other Tennessee counties.
Shelby County is milder than most of Tennessee, but not mild enough to skip winterizing. In the 2015–2024 record the county logged about 6 nights a year at or below 20°F (94th of 95) and 44 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 8 days below freezing (ending February 2021), and the low bottomed out near 1°F on December 23, 2022.
The freeze season here runs January, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Nov 12 and the last spring freeze around Mar 16.
Heavy rain is a bigger factor here than in most of Tennessee. About 15 days a year bring an inch or more (27th of 95), most often in March, out of 58.4 inches of total precipitation. On March 10, 2016, 4.8 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 8.65 inches (through March 11, 2016).
About 40 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
55% of homes in Shelby County predate 1980, above the Tennessee county median of 41.2%, which ranks 10th of Tennessee's 95 counties.
Before 1960 is when 27% 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.
27% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
Renters occupy 46% 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 113 nights a year in Shelby County stay at 65°F or warmer, a sign of muggy summer air (1st of 95 counties). March 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 expectBy main heating fuel, Shelby County homes break down as 45% utility gas, 53% electric, 1% 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 Shelby County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Every neighboring county gets more pipe-freeze nights than Shelby. It also has the most heavy-rain days in its area. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Shelby | Tennessee median | Rank |
|---|---|---|---|
| Homes built before 1960 | 27% | 16% | 6 of 95 |
| Homes built before 1980 | 55% | 41% | 10 of 95 |
| Homes built 2000 or later | 19% | 27% | 86 of 95 |
| Manufactured or mobile homes | 1.2% | 16% | 95 of 95 |
| Vacant homes | 10% | 12% | 58 of 95 |
| Wood or propane heat | 1.2% | 7.8% | 95 of 95 |
| Nights at 20°F or colder | 6/yr | 11/yr | 94 of 95 |
| Days with 1 inch+ of rain | 15/yr | 14/yr | 27 of 95 |
| Freeze-thaw days | 40/yr | 60/yr | 95 of 95 |
| Muggy nights (65°F+) | 113/yr | 74/yr | 1 of 95 |
Rank 1 is the highest value. Bars run from the lowest to the highest Tennessee county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Shelby County: freezing from January, heavy rain in February, March and December.
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