Mitchell County, Iowa · Osage
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With 52% of homes built before 1960 and about 74 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
June brings the most downpours to Mitchell County, part of 8.4 heavy-rain days a year. Check the sump first.
52% 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.
Mitchell County's wettest day in the 2015–2024 record brought 4.19 inches, and about 93 freeze-thaw days a year mean ice dams in some winters.
40% of occupied homes in Mitchell County heat mainly with wood or propane, above the Iowa county median of 22.1%.
About 16 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
Mitchell County covers 469 square miles of northern Iowa, with about 10,575 residents and 4,950 homes. Osage is the county seat; St. Ansgar, Stacyville and Mitchell are the next largest communities. It has some of the oldest housing in the state: the median home went up in 1957.
70/100 Water Damage Risk Index: High Mitchell County ranks 5 of 99 Iowa counties. See the statewide ranking and method.The three factors where Mitchell County ranks highest compared with other Iowa counties.
Mitchell County gets more hard-freeze nights than most of Iowa. In the 2015–2024 record the county logged about 74 nights a year at or below 20°F (14th of 99) and 155 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On January 31, 2019 the low fell to about -31°F, and in the stretch ending January 2018 the county went 19 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Expect the hardest freezes in January, inside a season that runs November to April. 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 13 and end around May 2.
Heavy rain is a bigger factor here than in most of Iowa. Of roughly 38.6 inches of yearly precipitation, the damage comes from the 8.4 days a year with an inch or more, ranked 13th of 99. May, June and July see the most. The single wettest day in the record: 4.19 inches, September 22, 2016. The worst three-day stretch dropped 7.14 inches, ending August 29, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
About 93 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
75% of homes in Mitchell County predate 1980, close to the Iowa county median of 72.8%, which ranks 38th of Iowa's 99 counties.
In Mitchell County 52% 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.
Beyond water
Mitchell County averages 16 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 expectBy main heating fuel, Mitchell County homes break down as 47% utility gas, 12% electric, 37% propane and 3% wood. Wood and propane heat are more common here than in most Iowa 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 Mitchell County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Howard and Worth get more pipe-freeze nights than Mitchell. Floyd County has the oldest housing nearby, with 83% of homes built before 1980.
By the numbers
| Factor | Mitchell | Iowa median | Rank |
|---|---|---|---|
| Homes built before 1960 | 52% | 48% | 27 of 99 |
| Homes built before 1980 | 75% | 73% | 38 of 99 |
| Homes built 2000 or later | 12% | 13% | 65 of 99 |
| Manufactured or mobile homes | 2.1% | 3.2% | 69 of 99 |
| Vacant homes | 7.1% | 9.5% | 82 of 99 |
| Wood or propane heat | 40% | 22% | 8 of 99 |
| Nights at 20°F or colder | 74/yr | 62/yr | 14 of 99 |
| Days with 1 inch+ of rain | 8.4/yr | 7.1/yr | 13 of 99 |
| Freeze-thaw days | 93/yr | 94/yr | 54 of 99 |
| Muggy nights (65°F+) | 16/yr | 29/yr | 94 of 99 |
Rank 1 is the highest value. Bars run from the lowest to the highest Iowa county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Mitchell County: freezing from November to April, heavy rain in May, June and July.
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