Nicollet County, Minnesota · St. Peter
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Pipes freeze in Nicollet County on about 79 nights a year, mostly November to March. Older homes, 29% of the stock here, are most at risk.
Basements flood here mostly in July. Nicollet County averages 5.3 days a year with an inch of rain or more.
29% 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.
Nicollet County's wettest day in the 2015–2024 record brought 3.25 inches, and about 80 freeze-thaw days a year mean ice dams in some winters.
14% of occupied homes in Nicollet County heat mainly with wood or propane, below the Minnesota county median of 30%.
Muggy summer nights, lows of 65°F or more, come about 22 times a year in Nicollet County. Mold after a leak spreads fastest from June through August.
Local risk profile
Nicollet County covers 449 square miles of southern Minnesota, with about 34,411 residents and 13,596 homes. The county seat is St. Peter, and North Mankato, Nicollet and Courtland round out the largest towns. Half the homes here were built before 1979, half after.
42/100 Water Damage Risk Index: Moderate Nicollet County ranks 64 of 87 Minnesota counties. See the statewide ranking and method.The three factors where Nicollet County ranks highest compared with other Minnesota counties.
Winters here are on the gentler end for Minnesota, and pipes still freeze. From 2015–2024 it averaged 79 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 149 nights at or below 32°F. That ranks 71st of 87 counties.
Cold snaps are the real risk. The worst in the record lasted 34 days below freezing (ending March 2019), and the low bottomed out near -27°F on January 31, 2019.
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.
Freezing nights typically start around Oct 15 and end around Apr 28.
Rainfall is about average for Minnesota. The county gets about 30.2 inches of rain and melted snow a year, with 5.3 days of an inch or more (43rd of 87). Those downpours cluster in May, July and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.25 inches on August 11, 2016. The worst three-day stretch dropped 4.01 inches, ending September 13, 2019, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 80 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 52% of the county's housing was built before 1980. That puts Nicollet near the middle of Minnesota's 87 counties.
Growth since 2000 added 27% of today's homes. In houses that new, the weak points are washing machine hoses, ice maker lines, water heaters and sump pumps rather than the pipes in the walls.
Renters occupy 28% 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
Nicollet County averages 22 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 expectMain heating fuel in Nicollet County's occupied homes: 67% utility gas, 16% electric, 12% propane and 2% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Nicollet County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Brown, Renville and Sibley get more pipe-freeze nights than Nicollet. Renville County has the oldest housing nearby, with 77% of homes built before 1980.
By the numbers
| Factor | Nicollet | Minnesota median | Rank |
|---|---|---|---|
| Homes built before 1960 | 29% | 34% | 57 of 87 |
| Homes built before 1980 | 52% | 58% | 56 of 87 |
| Homes built 2000 or later | 27% | 21% | 26 of 87 |
| Manufactured or mobile homes | 4.2% | 3.8% | 38 of 87 |
| Vacant homes | 4.4% | 11% | 80 of 87 |
| Wood or propane heat | 14% | 30% | 74 of 87 |
| Nights at 20°F or colder | 79/yr | 89/yr | 71 of 87 |
| Days with 1 inch+ of rain | 5.3/yr | 5.3/yr | 43 of 87 |
| Freeze-thaw days | 80/yr | 86/yr | 83 of 87 |
| Muggy nights (65°F+) | 22/yr | 13/yr | 5 of 87 |
Rank 1 is the highest value. Bars run from the lowest to the highest Minnesota county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Nicollet County: freezing from November to March, heavy rain in May, 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