Polk County, Nebraska · Osceola
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Polk County averages 60 nights a year at 20°F or colder, mostly November to March, and 50% of its homes predate 1960.
Heavy rain days of an inch or more come about 5.9 times a year here, most often in June. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Polk County gets about 5.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Polk County, 4.31 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
22% of occupied homes in Polk County heat mainly with wood or propane, above the Nebraska county median of 19.4%.
With 37 muggy nights a year, mold in Polk County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 2,531 homes and around 5,225 residents, Polk County is 439 square miles of eastern Nebraska. Besides Osceola, the county seat, the biggest communities are Stromsburg, Shelby and Polk. Half the homes here were built before 1960, half after.
58/100 Water Damage Risk Index: Elevated Polk County ranks 24 of 93 Nebraska counties. See the statewide ranking and method.The three factors where Polk County ranks highest compared with other Nebraska counties.
Pipe-freeze risk in Polk County sits near the middle of the state. From 2015–2024 it averaged 60 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 138 nights at or below 32°F. That ranks 59th of 93 counties.
Cold snaps are the real risk. The worst in the record lasted 17 days below freezing (ending February 2021), and the low bottomed out near -30°F on February 16, 2021.
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 18 and end around Apr 22.
Heavy rain is a bigger factor here than in most of Nebraska. About 5.9 days a year bring an inch or more (19th of 93), most often in June, out of 28.8 inches of total precipitation. On August 16, 2017, 4.31 inches fell in a single day. The worst three-day stretch dropped 5.24 inches, ending March 16, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 101 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
Nebraska's 93 counties range widely in housing age; Polk ranks 34th, with 77% of its homes built before 1980.
The mix runs from 50% built before 1960 to 10% built since 2000, so older neighborhoods bring aging pipe while newer subdivisions bring failed appliance lines and water heaters.
With 17% of homes empty at survey time, landlords and seasonal owners should shut off the main or schedule checks in winter. An unheated vacant house is also where many policies limit freeze coverage.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 37 times a year here, above the Nebraska county median of 27. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectBy main heating fuel, Polk County homes break down as 40% utility gas, 34% electric, 19% propane and 3% wood. Wood heat is above the Nebraska norm. Annual chimney and vent inspection, which the NFPA recommends, is one of the most effective fire-prevention habits for these homes.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Polk County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Platte gets more pipe-freeze nights than Polk. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Polk | Nebraska median | Rank |
|---|---|---|---|
| Homes built before 1960 | 50% | 49% | 44 of 93 |
| Homes built before 1980 | 77% | 73% | 34 of 93 |
| Homes built 2000 or later | 10% | 12% | 59 of 93 |
| Manufactured or mobile homes | 6% | 5% | 35 of 93 |
| Vacant homes | 17% | 14% | 34 of 93 |
| Wood or propane heat | 22% | 19% | 38 of 93 |
| Nights at 20°F or colder | 60/yr | 64/yr | 59 of 93 |
| Days with 1 inch+ of rain | 5.9/yr | 5.1/yr | 19 of 93 |
| Freeze-thaw days | 101/yr | 112/yr | 71 of 93 |
| Muggy nights (65°F+) | 37/yr | 27/yr | 21 of 93 |
Rank 1 is the highest value. Bars run from the lowest to the highest Nebraska county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Polk 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