Winnebago County, Illinois · Rockford
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Pipes freeze in Winnebago County on about 52 nights a year, mostly November to March. Older homes, 36% of the stock here, are most at risk.
Basements flood here mostly in July. Winnebago County averages 7.8 days a year with an inch of rain or more.
36% 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.
Winnebago County's wettest day in the 2015–2024 record brought 2.84 inches, and about 89 freeze-thaw days a year mean ice dams in some winters.
3% of occupied homes in Winnebago County heat mainly with wood or propane, below the Illinois county median of 16.5%.
Muggy summer nights, lows of 65°F or more, come about 25 times a year in Winnebago County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 283,292 people live in Winnebago County, 513 square miles in northern Illinois, in roughly 125,002 homes. Besides Rockford, the county seat, the biggest communities are Loves Park, Machesney Park and Roscoe. Half the homes here were built before 1971, half after.
50/100 Water Damage Risk Index: Elevated Winnebago County ranks 55 of 102 Illinois counties. See the statewide ranking and method.The three factors where Winnebago County ranks highest compared with other Illinois counties.
Winnebago County gets more hard-freeze nights than most of Illinois. In the 2015–2024 record the county logged about 52 nights a year at or below 20°F (3rd of 102) and 131 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On January 31, 2019 the low fell to about -29°F, and in the stretch ending February 2019 the county went 24 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
The freeze season here runs November to March, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
Freezing nights typically start around Oct 22 and end around Apr 24.
Rainfall is about average for Illinois. The county gets about 38.5 inches of rain and melted snow a year, with 7.8 days of an inch or more (63rd of 102). Those downpours cluster in June, July and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.84 inches on September 12, 2022. The worst three-day stretch dropped 4.73 inches, ending July 22, 2017, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 89 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
Roughly 63% of the county's housing was built before 1980. That puts Winnebago near the middle of Illinois's 102 counties.
Older and newer homes sit side by side here: 36% predate 1960 and 14% are from 2000 or later. Corroded pipe is the typical failure in the first group, burst supply hoses in the second.
About 23% 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.
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
Winnebago County averages 25 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in June. 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 expectMain heating fuel in Winnebago County's occupied homes: 84% utility gas, 13% electric, 2% propane and under 1% 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 Winnebago County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Stephenson gets more pipe-freeze nights than Winnebago. Stephenson County has the oldest housing nearby, with 75% of homes built before 1980.
By the numbers
| Factor | Winnebago | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 36% | 38% | 65 of 102 |
| Homes built before 1980 | 63% | 66% | 59 of 102 |
| Homes built 2000 or later | 14% | 15% | 56 of 102 |
| Manufactured or mobile homes | 1.3% | 5.6% | 94 of 102 |
| Vacant homes | 7.2% | 11% | 85 of 102 |
| Wood or propane heat | 2.7% | 17% | 97 of 102 |
| Nights at 20°F or colder | 52/yr | 35/yr | 3 of 102 |
| Days with 1 inch+ of rain | 7.8/yr | 8.4/yr | 63 of 102 |
| Freeze-thaw days | 89/yr | 81/yr | 11 of 102 |
| Muggy nights (65°F+) | 25/yr | 51/yr | 100 of 102 |
Rank 1 is the highest value. Bars run from the lowest to the highest Illinois county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Winnebago County: freezing from November to March, heavy rain in June, July 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