Baltimore County, Maryland · Towson
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Baltimore County averages 17 nights a year at 20°F or colder, mostly December to March, and 32% of its homes predate 1960.
Heavy rain days of an inch or more come about 10.6 times a year here, most often in July. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Baltimore County gets about 10.6 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.
3% of occupied homes in Baltimore County heat mainly with wood or propane, below the Maryland county median of 9.3%.
Muggy summer nights, lows of 65°F or more, come about 61 times a year in Baltimore County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 850,796 people live in Baltimore County, 598 square miles in northeast Maryland, in roughly 350,821 homes. The county seat is Towson, and Dundalk, Catonsville and Essex round out the largest towns. The county's median home was built in 1973.
75/100 Water Damage Risk Index: High Baltimore County ranks 1 of 23 Maryland counties. See the statewide ranking and method.The three factors where Baltimore County ranks highest compared with other Maryland counties.
Baltimore is on the colder side of Maryland for pipes. In the 2015–2024 record the county logged about 17 nights a year at or below 20°F (7th of 23) and 88 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 12 days below freezing (ending January 2018), and the low bottomed out near 0°F on February 20, 2015.
Expect the hardest freezes in January, inside a season that runs December 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.
On average the first fall freeze arrives around Nov 8 and the last spring freeze around Apr 4.
Heavy rain is a bigger factor here than in most of Maryland. About 10.6 days a year bring an inch or more (1st of 23), most often in July, out of 47.4 inches of total precipitation. On July 22, 2018, 4.53 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 7.63 inches (through July 24, 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
59% of homes in Baltimore County predate 1980, above the Maryland county median of 43.9%, which ranks 2nd of Maryland's 23 counties.
32% were built before 1960. Homes from that era often still have galvanized steel supply pipe, which rusts from the inside until it pinholes, and cast iron drains that crack with age. Slow leaks behind walls are a common start to water damage in these houses.
26% 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 34% 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
Baltimore County averages 61 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in July. 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, Baltimore County homes break down as 52% utility gas, 38% electric, 3% propane and under 1% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Baltimore County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Carroll and Harford get more pipe-freeze nights than Baltimore. 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 | Baltimore | Maryland median | Rank |
|---|---|---|---|
| Homes built before 1960 | 32% | 20% | 5 of 23 |
| Homes built before 1980 | 59% | 44% | 2 of 23 |
| Homes built 2000 or later | 15% | 23% | 22 of 23 |
| Manufactured or mobile homes | 0.8% | 2.6% | 17 of 23 |
| Vacant homes | 5.1% | 7.7% | 15 of 23 |
| Wood or propane heat | 3.1% | 9.3% | 20 of 23 |
| Nights at 20°F or colder | 17/yr | 12/yr | 7 of 23 |
| Days with 1 inch+ of rain | 11/yr | 9.3/yr | 1 of 23 |
| Freeze-thaw days | 80/yr | 70/yr | 6 of 23 |
| Muggy nights (65°F+) | 61/yr | 76/yr | 17 of 23 |
Rank 1 is the highest value. Bars run from the lowest to the highest Maryland county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Baltimore County: freezing from December to March, heavy rain in April, July and September.
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