Norman County, Minnesota · Ada
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Pipes freeze in Norman County on about 110 nights a year, mostly November to April. Older homes, 51% of the stock here, are most at risk.
Basements flood here mostly in July. Norman County averages 3.5 days a year with an inch of rain or more.
Backups often follow heavy rain, which Norman County gets about 3.5 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 82 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
33% of occupied homes in Norman County heat mainly with wood or propane, above the Minnesota county median of 30%.
With 5 muggy nights a year, mold in Norman County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 6,367 people live in Norman County, 873 square miles in northwest Minnesota, in roughly 3,223 homes. Ada is the county seat; Twin Valley, Halstad and Gary are the next largest communities. It has some of the oldest housing in the state: the median home went up in 1959.
59/100 Water Damage Risk Index: Elevated Norman County ranks 22 of 87 Minnesota counties. See the statewide ranking and method.The three factors where Norman County ranks highest compared with other Minnesota counties.
Norman is on the colder side of Minnesota for pipes. From 2015–2024 it averaged 110 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 176 nights at or below 32°F. That ranks 16th of 87 counties.
The longest cold spell was straight 63 days without the temperature rising above freezing, ending in March 2019. The coldest night reached about -35°F on January 30, 2019. Burst pipes usually show up when a spell like that breaks and the ice thaws.
Most freezing nights fall from November to April, 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 6 and the last spring freeze around May 9.
Norman gets fewer downpours than most Minnesota counties, but they still fill basements. The county gets about 22.7 inches of rain and melted snow a year, with 3.5 days of an inch or more (70th of 87). Those downpours cluster in June, July and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.68 inches on September 20, 2017. Multi-day storms matter most for basements; the wettest three days on record here totaled 3.63 inches (through July 12, 2016).
About 82 days a year swing from below freezing at night to above freezing by day. Those freeze-thaw cycles feed ice dams on roofs, open cracks in foundations and driveways, and stress pipes that are already marginal.
Housing
77% of homes in Norman County predate 1980, above the Minnesota county median of 58.4%, which ranks 10th of Minnesota's 87 counties.
In Norman County 51% of homes are older than 1960. If yours is one of them and the plumbing has never been replaced, expect galvanized steel supply pipe and cast iron drain lines, the two materials most likely to fail quietly.
The Census counted 16% of homes as vacant, above the Minnesota county median of 11%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
Norman County averages 5 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in June. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectMain heating fuel in Norman County's occupied homes: 31% utility gas, 26% electric, 30% propane and 3% wood. Wood heat is more common here than in most Minnesota 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 Norman County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Mahnomen gets more pipe-freeze nights than Norman. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Norman | Minnesota median | Rank |
|---|---|---|---|
| Homes built before 1960 | 51% | 34% | 12 of 87 |
| Homes built before 1980 | 77% | 58% | 10 of 87 |
| Homes built 2000 or later | 9.9% | 21% | 77 of 87 |
| Manufactured or mobile homes | 3.8% | 3.8% | 43 of 87 |
| Vacant homes | 16% | 11% | 28 of 87 |
| Wood or propane heat | 33% | 30% | 36 of 87 |
| Nights at 20°F or colder | 110/yr | 89/yr | 16 of 87 |
| Days with 1 inch+ of rain | 3.5/yr | 5.3/yr | 70 of 87 |
| Freeze-thaw days | 82/yr | 86/yr | 71 of 87 |
| Muggy nights (65°F+) | 5/yr | 13/yr | 66 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 Norman County: freezing from November to April, 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