Hillsdale County, Michigan · Hillsdale
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Hillsdale County averages 43 nights a year at 20°F or colder, mostly November to March, and 41% of its homes predate 1960.
Basements flood here mostly in May. Hillsdale County averages 5.6 days a year with an inch of rain or more.
Sewage backups in Hillsdale County spike on heavy-rain days, about 5.6 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 91 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
45% of occupied homes in Hillsdale County heat mainly with wood or propane, above the Michigan county median of 29%.
About 17 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
About 45,654 people live in Hillsdale County, 598 square miles in southwest Michigan, in roughly 21,515 homes. Besides Hillsdale, the county seat, the biggest communities are Jonesville, Lake LeAnn and Litchfield. Half the homes here were built before 1971, half after.
63/100 Water Damage Risk Index: Elevated Hillsdale County ranks 10 of 83 Michigan counties. See the statewide ranking and method.The three factors where Hillsdale County ranks highest compared with other Michigan counties.
Winters here are on the gentler end for Michigan, and pipes still freeze. It averaged 130 freezing nights a year over 2015–2024, 43 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 83 Michigan counties that's 64th.
Cold snaps are the real risk. The worst in the record lasted 22 days below freezing (ending March 2015), and the low bottomed out near -19°F on January 31, 2019.
Expect the hardest freezes in January, inside a season that runs November 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.
Freezing nights typically start around Oct 21 and end around Apr 30.
Heavy rain is a bigger factor here than in most of Michigan. The county gets about 37.9 inches of rain and melted snow a year, with 5.6 days of an inch or more (7th of 83). Those downpours cluster in May, June and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.47 inches on August 16, 2016. The worst three-day stretch dropped 4.37 inches, ending September 24, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 91 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
62% of homes in Hillsdale County predate 1980, close to the Michigan county median of 58.4%, which ranks 32nd of Michigan's 83 counties.
41% 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.
24% 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.
9% of homes are manufactured or mobile homes, above the Michigan county median of 7.3%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
Beyond water
Hillsdale County averages 17 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in May. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectHeating fuel matters for fire risk. In Hillsdale County it's 44% utility gas, 6% electric, 37% propane and 8% wood. Wood and propane heat are more common here than in most Michigan counties. Heating equipment is one of the leading causes of home fires nationally, and the NFPA recommends having chimneys and vents inspected every year.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Hillsdale County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Jackson gets more pipe-freeze nights than Hillsdale. Calhoun County has the oldest housing nearby, with 74% of homes built before 1980.
By the numbers
| Factor | Hillsdale | Michigan median | Rank |
|---|---|---|---|
| Homes built before 1960 | 41% | 32% | 17 of 83 |
| Homes built before 1980 | 62% | 58% | 32 of 83 |
| Homes built 2000 or later | 14% | 16% | 56 of 83 |
| Manufactured or mobile homes | 9.2% | 7.3% | 24 of 83 |
| Vacant homes | 17% | 20% | 49 of 83 |
| Wood or propane heat | 45% | 29% | 18 of 83 |
| Nights at 20°F or colder | 43/yr | 54/yr | 64 of 83 |
| Days with 1 inch+ of rain | 5.6/yr | 3.9/yr | 7 of 83 |
| Freeze-thaw days | 91/yr | 95/yr | 53 of 83 |
| Muggy nights (65°F+) | 17/yr | 10/yr | 31 of 83 |
Rank 1 is the highest value. Bars run from the lowest to the highest Michigan county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Hillsdale County: freezing from November to March, heavy rain in May, June and August.
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