Alleghany County, North Carolina · Sparta
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Alleghany County averages 21 nights a year at 20°F or colder, mostly November to March, and 17% of its homes predate 1960.
Heavy rain days of an inch or more come about 15 times a year here, most often in September. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Alleghany County gets about 15 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 89 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
24% of occupied homes in Alleghany County heat mainly with wood or propane, above the North Carolina county median of 11.7%.
Muggy summer nights, lows of 65°F or more, come about 6 times a year in Alleghany County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 11,174 people live in Alleghany County, 235 square miles in northern North Carolina, in roughly 7,804 homes. The county seat is Sparta. The county's median home was built in 1980.
65/100 Water Damage Risk Index: Elevated Alleghany County ranks 11 of 100 North Carolina counties. See the statewide ranking and method.The three factors where Alleghany County ranks highest compared with other North Carolina counties.
Alleghany is on the colder side of North Carolina for pipes. It averaged 96 freezing nights a year over 2015–2024, 21 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 100 North Carolina counties that's 8th.
On February 20, 2015 the low fell to about -3°F, and in the stretch ending January 2018 the county went 8 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 27 and the last spring freeze around Apr 20.
Heavy rain is a bigger factor here than in most of North Carolina. About 15 days a year bring an inch or more (12th of 100), most often in September, out of 60 inches of total precipitation. On September 17, 2018, 5.88 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 9.63 inches (through September 28, 2024).
The temperature crosses 32°F in both directions on roughly 89 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 51% of the county's housing was built before 1980. That puts Alleghany among the oldest housing stocks of North Carolina's 100 counties.
Housing age is mixed: 17% of homes are pre-1960 and 21% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
About 29% 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.
Manufactured and mobile homes make up 17% of the housing here. Water lines in the underbelly depend on intact skirting and working heat tape, and they're usually the first to freeze in a cold snap.
34% of homes were vacant at survey time. A leak in an empty rental or seasonal house can run for days before anyone notices, which is why those losses tend to be larger.
Beyond water
Alleghany County averages 6 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in May. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectHeating fuel matters for fire risk. In Alleghany County it's 3% utility gas, 50% electric, 15% propane and 10% 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 Alleghany County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Ashe gets more pipe-freeze nights than Alleghany. It also has the most heavy-rain days in its area. Surry County has the oldest housing nearby, with 51% of homes built before 1980.
By the numbers
| Factor | Alleghany | North Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 17% | 18% | 55 of 100 |
| Homes built before 1980 | 51% | 41% | 15 of 100 |
| Homes built 2000 or later | 21% | 26% | 80 of 100 |
| Manufactured or mobile homes | 17% | 17% | 54 of 100 |
| Vacant homes | 34% | 13% | 6 of 100 |
| Wood or propane heat | 24% | 12% | 17 of 100 |
| Nights at 20°F or colder | 21/yr | 5/yr | 8 of 100 |
| Days with 1 inch+ of rain | 15/yr | 12/yr | 12 of 100 |
| Freeze-thaw days | 89/yr | 57/yr | 4 of 100 |
| Muggy nights (65°F+) | 6/yr | 89/yr | 89 of 100 |
Rank 1 is the highest value. Bars run from the lowest to the highest North Carolina county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Alleghany County: freezing from November to March, heavy rain in May, September and October.
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