Shelby County, Iowa · Harlan
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With 59% of homes built before 1960 and about 63 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
August brings the most downpours to Shelby County, part of 7.3 heavy-rain days a year. Check the sump first.
59% 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.
In Shelby County, 4.43 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
18% of occupied homes in Shelby County heat mainly with wood or propane, below the Iowa county median of 22.1%.
Muggy summer nights, lows of 65°F or more, come about 29 times a year in Shelby County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 5,441 homes and around 11,778 residents, Shelby County is 591 square miles of western Iowa. Besides Harlan, the county seat, the biggest communities are Shelby, Elk Horn and Earling. It has some of the oldest housing in the state: the median home went up in 1949.
66/100 Water Damage Risk Index: Elevated Shelby County ranks 11 of 99 Iowa counties. See the statewide ranking and method.The three factors where Shelby County ranks highest compared with other Iowa counties.
For frozen pipes, Shelby County is a typical Iowa county, which is still plenty. In the 2015–2024 record the county logged about 63 nights a year at or below 20°F (47th of 99) and 138 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
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 -26°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.
On average the first fall freeze arrives around Oct 19 and the last spring freeze around Apr 23.
Rainfall is about average for Iowa. About 7.3 days a year bring an inch or more (38th of 99), most often in August, out of 34 inches of total precipitation. On August 20, 2018, 4.43 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.68 inches (through August 21, 2018).
About 95 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
79% of homes in Shelby County predate 1980, above the Iowa county median of 72.8%, which ranks 19th of Iowa's 99 counties.
Before 1960 is when 59% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
Beyond water
About 29 nights a year in Shelby County stay at 65°F or warmer, a sign of muggy summer air (50th of 99 counties). May is the wettest month. 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, Shelby County homes break down as 48% utility gas, 33% electric, 17% propane and under 1% 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 Shelby County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Audubon and Crawford get more pipe-freeze nights than Shelby. Audubon County has the oldest housing nearby, with 84% of homes built before 1980.
By the numbers
| Factor | Shelby | Iowa median | Rank |
|---|---|---|---|
| Homes built before 1960 | 59% | 48% | 7 of 99 |
| Homes built before 1980 | 79% | 73% | 19 of 99 |
| Homes built 2000 or later | 9.6% | 13% | 79 of 99 |
| Manufactured or mobile homes | 4.3% | 3.2% | 29 of 99 |
| Vacant homes | 10% | 9.5% | 37 of 99 |
| Wood or propane heat | 18% | 22% | 74 of 99 |
| Nights at 20°F or colder | 63/yr | 62/yr | 47 of 99 |
| Days with 1 inch+ of rain | 7.3/yr | 7.1/yr | 38 of 99 |
| Freeze-thaw days | 95/yr | 94/yr | 29 of 99 |
| Muggy nights (65°F+) | 29/yr | 29/yr | 50 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 Shelby County: freezing from November to March, heavy rain in May, August and September.
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