Montgomery County, Virginia · Christiansburg
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Pipes freeze in Montgomery County on about 21 nights a year, mostly November to March. Older homes, 14% of the stock here, are most at risk.
September brings the most downpours to Montgomery County, part of 8.4 heavy-rain days a year. Check the sump first.
Sewage backups in Montgomery County spike on heavy-rain days, about 8.4 a year, when sewer mains fill up and water finds the lowest drain.
Montgomery County's wettest day in the 2015–2024 record brought 3.41 inches, and about 87 freeze-thaw days a year mean ice dams in some winters.
5% of occupied homes in Montgomery County heat mainly with wood or propane, below the Virginia county median of 11.9%.
Muggy summer nights, lows of 65°F or more, come about 18 times a year in Montgomery County. Mold after a leak spreads fastest from June through August.
Local risk profile
Montgomery County covers 387 square miles of southern Virginia, with about 99,101 residents and 42,794 homes. Christiansburg is the county seat; Blacksburg, Merrimac and Shawsville are the next largest communities. Much of its housing is recent, with a median build year of 1986.
40/100 Water Damage Risk Index: Moderate Montgomery County ranks 79 of 95 Virginia counties. See the statewide ranking and method.The three factors where Montgomery County ranks highest compared with other Virginia counties.
Montgomery is on the colder side of Virginia for pipes. It averaged 95 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 95 Virginia counties that's 20th.
The longest cold spell was straight 8 days without the temperature rising above freezing, ending in January 2018. The coldest night reached about -4°F on February 21, 2015. Burst pipes usually show up when a spell like that breaks and the ice thaws.
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 18.
Montgomery gets fewer downpours than most Virginia counties, but they still fill basements. The county gets about 44.6 inches of rain and melted snow a year, with 8.4 days of an inch or more (75th of 95). Those downpours cluster in May, September and October, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.41 inches on September 22, 2021. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.76 inches (through September 30, 2015).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 87 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
Virginia's 95 counties range widely in housing age; Montgomery ranks 61st, with 39% of its homes built before 1980.
Housing age is mixed: 14% of homes are pre-1960 and 29% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
The 1980s and 1990s account for 32% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
Manufactured and mobile homes make up 9% 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.
Renters occupy 45% 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
Montgomery County averages 18 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in September. 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 expectBy main heating fuel, Montgomery County homes break down as 16% utility gas, 76% electric, 3% propane and 3% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Montgomery County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Craig, Floyd, Giles and Pulaski get more pipe-freeze nights than Montgomery. Giles County has the oldest housing nearby, with 61% of homes built before 1980.
By the numbers
| Factor | Montgomery | Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 14% | 20% | 67 of 95 |
| Homes built before 1980 | 39% | 46% | 61 of 95 |
| Homes built 2000 or later | 29% | 25% | 34 of 95 |
| Manufactured or mobile homes | 9.1% | 9.6% | 52 of 95 |
| Vacant homes | 14% | 15% | 51 of 95 |
| Wood or propane heat | 5.1% | 12% | 86 of 95 |
| Nights at 20°F or colder | 21/yr | 14/yr | 20 of 95 |
| Days with 1 inch+ of rain | 8.4/yr | 10/yr | 75 of 95 |
| Freeze-thaw days | 87/yr | 77/yr | 18 of 95 |
| Muggy nights (65°F+) | 18/yr | 64/yr | 81 of 95 |
Rank 1 is the highest value. Bars run from the lowest to the highest Virginia county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Montgomery 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